{"id":169552,"date":"2015-07-17T09:00:59","date_gmt":"2015-07-17T13:00:59","guid":{"rendered":"http:\/\/webadmin.news-harvard.go-vip.net\/gazette\/gazette\/?p=169552"},"modified":"2015-07-17T09:00:59","modified_gmt":"2015-07-17T13:00:59","slug":"tiny-wires-great-potential","status":"publish","type":"post","link":"https:\/\/news.harvard.edu\/gazette\/story\/2015\/07\/tiny-wires-great-potential\/","title":{"rendered":"Tiny wires, great potential"},"content":{"rendered":"\n\t\n\t
\n\t\t\t\n\t\t\tScience & Tech\t\t<\/a>\n\t\t\n\t\t

\n\t\tTiny wires, great potential\t<\/h1>\n\n\t\n\t\n\t
\n\t\t
\n\t\t\t
\n\t\t\t\t\t

\n\t\tPeter Reuell\t<\/p>\n\t\t\t

\n\t\t\tHarvard Staff Writer\t\t<\/p>\n\t\t\t\t\t<\/address>\n\t\t<\/div>\n\n\t\t

\n\t\t\tHarvard scientists develop method that creates nanowires with new useful properties\t\t<\/h2>\n\t\t\n<\/header>\n\n\n\n
\n\n\n\t\t

Harvard scientists have developed a first-of-its-kind method of creating a class of nanowires that one day could have applications in areas ranging from consumer electronics to solar panels.<\/p>\n

The technique, developed by Bobby Day and Max Mankin, graduate students working in the lab of Charles Lieber,<\/a> the Mark Hyman Jr. Professor of Chemistry, takes advantage of two long-understood principles. One is Plateau-Rayleigh instability, an aspect of fluid dynamics that describes why a thin stream of water breaks up into smaller droplets. The other involves crystal growth. The technique is described in a paper recently published in the journal Nature Nanotechnology.<\/p>\n

\u201cThis is really a fundamental discovery,\u201d Day said. \u201cWe\u2019re still in the early stages, but we think there is a lot of room for discovery, both of fundamental properties of these structures as well as applications.\u201d<\/p>\n

First described in 1870, Plateau-Rayleigh instability is normally associated with liquids, but researchers for years have recognized a similar phenomenon in nanowires. When heated to extreme temperatures, the wires transform from solid into a series of periodically spaced droplets.<\/p>\n

To create the new type of wire, Day and Mankin heated traditionally grown nanowires to just below that transformation point in a vacuum chamber, then pumped in silicon atoms, which spontaneously crystallize on the wire.<\/p>\n

Rather than form a uniform shell, the atoms grow into regularly spaced structures, similar to the droplets that appear when nanowires break down at high temperatures. Unlike with the droplets, though, the process can be tightly controlled.<\/p>\n

\u201cBy varying the temperature and pressure, we can exert some control over the size and spacing of these structures,\u201d Day said. \u201cWhat we found was if we change the conditions, we can \u2018tune\u2019 how these structures are built.\u201d<\/p>\n

Along with duplicating the process in nanowires between 20 and 100 nanometers in diameter, researchers demonstrated the process using several combinations of materials, including silicon and germanium. In addition to being able to \u201ctune\u201d the distance between the lobes on nanowires, Mankin said tests showed they were also able to tune the cross-section of the wires.<\/p>\n

\u201cWe can tune the cross-section to produce more rounded or square-type wires,\u201d Mankin said. \u201cWe were also able to produce wires with a platelet-like shape.\u201d<\/p>\n

With those new structures, researchers found, came new properties for the wires. While Day and Mankin\u2019s study focused on the wires\u2019 ability to absorb different wavelengths of light, both said additional research is needed to explore other properties.<\/p>\n

\u201cThis paper is just one example,\u201d Day said. \u201cThere are many other properties \u2014 including thermal conductance, electrical conductance, and magnetic properties \u2014 that depend on the wires\u2019 diameter, and they still need to be explored.\u201d<\/p>\n

Though it may take years to fully explore those additional properties, Day and Mankin said applications for the new wires could emerge in the near term.<\/p>\n

\u201cStructures at this scale, because they are sub-wavelength in size, absorb light very efficiently,\u201d Day explained. \u201cThey act almost like optical antennas, and funnel the light into them. Previous research has shown that different diameter wires absorb different wavelengths of light. For example, very small diameters absorb blue light well, and larger diameters absorb green light. What we showed is if you have this modulation along the structure \u2026 we can have the best of both worlds and absorb both wavelengths on the same structure.\u201d<\/p>\n

The new wires\u2019 unusual light-absorption abilities don\u2019t end there, though.<\/p>\n

By shrinking the space between the crystalline structures, Day and Mankin discovered that the wires not only absorb light at specific wavelengths, they also absorb light from other parts of the spectrum.<\/p>\n

\u201cIt\u2019s actually more than a simple additive effect,\u201d Day said. \u201cAs you shrink the spacing down to distances smaller than about 400 nanometers, it creates what are called grating modes, and we see these huge absorption peaks in the infrared. What that means is that you could absorb the same amount of infrared light with these nanowires as you could with traditional silicon materials that are 100 times thicker.\u201d<\/p>\n

\u201cThis is a powerful discovery because previously, if you wanted to use nanowires for photo-detection of green and blue light, you\u2019d need two wires,\u201d Mankin said. \u201cNow we can shrink the amount of space a device might take up by having multiple functions in a single wire. We will be able to build smaller devices that still maintain high efficiency, and in some cases will take advantages of new properties that will emerge from this modulation that you don\u2019t have in uniform-diameter wires.\u201d<\/p>\n\n\n\n<\/div>\n\n\t\t","protected":false},"excerpt":{"rendered":"

Harvard scientists have developed a method for creating a class of nanowires that could one day see applications in everything from consumer electronics to solar panels. <\/p>\n","protected":false},"author":105622744,"featured_media":169554,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"gz_ga_pageviews":10,"gz_ga_lastupdated":"2019-02-26 04:09","document_color_palette":null,"author":"Peter Reuell","affiliation":"Harvard Staff 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from consumer electronics to solar panels.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/news.harvard.edu\/gazette\/story\/2015\/07\/tiny-wires-great-potential\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tiny wires, great potential — Harvard Gazette\" \/>\n<meta property=\"og:description\" content=\"Harvard scientists have developed a method for creating a class of nanowires that could one day see applications in everything from consumer electronics to solar panels.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/news.harvard.edu\/gazette\/story\/2015\/07\/tiny-wires-great-potential\/\" \/>\n<meta property=\"og:site_name\" content=\"Harvard Gazette\" \/>\n<meta property=\"article:published_time\" content=\"2015-07-17T13:00:59+00:00\" \/>\n<meta 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class=\"wp-block-post-author\">\n\t\t\t<address class=\"wp-block-post-author__content\">\n\t\t\t\t\t<p class=\"author wp-block-post-author__name\">\n\t\tPeter Reuell\t<\/p>\n\t\t\t<p class=\"wp-block-post-author__byline\">\n\t\t\tHarvard Staff Writer\t\t<\/p>\n\t\t\t\t\t<\/address>\n\t\t<\/div>\n\n\t\t<time class=\"article-header__date\" datetime=\"2015-07-17\">\n\t\t\tJuly 17, 2015\t\t<\/time>\n\n\t\t<span class=\"article-header__reading-time\">\n\t\t\t4 min read\t\t<\/span>\n\t<\/div>\n\n\t\t\t<\/div>\n\t\t\n\t\t\t<h2 class=\"article-header__subheading wp-block-heading\">\n\t\t\tHarvard scientists develop method that creates nanowires with new useful properties\t\t<\/h2>\n\t\t\n<\/header>\n"},"2":{"blockName":"core\/group","attrs":{"templateLock":false,"metadata":{"name":"Article content"},"align":"wide","layout":{"type":"constrained","justifyContent":"center"},"tagName":"div","lock":[],"className":"","style":[],"backgroundColor":"","textColor":"","gradient":"","fontSize":"","fontFamily":"","borderColor":"","ariaLabel":"","anchor":""},"innerBlocks":[{"blockName":"core\/freeform","attrs":{"content":"","lock":[],"metadata":[]},"innerBlocks":[],"innerHTML":"\n\t\t<p>Harvard scientists have developed a first-of-its-kind method of creating a class of nanowires that one day could have applications in areas ranging from consumer electronics to solar panels.<\/p>\n<p>The technique, developed by Bobby Day and Max Mankin, graduate students working in the lab of <a href=\"http:\/\/www.seas.harvard.edu\/directory\/clieber\">Charles Lieber,<\/a> the Mark Hyman Jr. Professor of Chemistry, takes advantage of two long-understood principles. One is Plateau-Rayleigh instability, an aspect of fluid dynamics that describes why a thin stream of water breaks up into smaller droplets. The other involves crystal growth. The technique is described in a paper recently published in the journal Nature Nanotechnology.<\/p>\n<p>\u201cThis is really a fundamental discovery,\u201d Day said. \u201cWe\u2019re still in the early stages, but we think there is a lot of room for discovery, both of fundamental properties of these structures as well as applications.\u201d<\/p>\n<p>First described in 1870, Plateau-Rayleigh instability is normally associated with liquids, but researchers for years have recognized a similar phenomenon in nanowires. When heated to extreme temperatures, the wires transform from solid into a series of periodically spaced droplets.<\/p>\n<p>To create the new type of wire, Day and Mankin heated traditionally grown nanowires to just below that transformation point in a vacuum chamber, then pumped in silicon atoms, which spontaneously crystallize on the wire.<\/p>\n<p>Rather than form a uniform shell, the atoms grow into regularly spaced structures, similar to the droplets that appear when nanowires break down at high temperatures. Unlike with the droplets, though, the process can be tightly controlled.<\/p>\n<p>\u201cBy varying the temperature and pressure, we can exert some control over the size and spacing of these structures,\u201d Day said. \u201cWhat we found was if we change the conditions, we can \u2018tune\u2019 how these structures are built.\u201d<\/p>\n<p>Along with duplicating the process in nanowires between 20 and 100 nanometers in diameter, researchers demonstrated the process using several combinations of materials, including silicon and germanium. In addition to being able to \u201ctune\u201d the distance between the lobes on nanowires, Mankin said tests showed they were also able to tune the cross-section of the wires.<\/p>\n<p>\u201cWe can tune the cross-section to produce more rounded or square-type wires,\u201d Mankin said. \u201cWe were also able to produce wires with a platelet-like shape.\u201d<\/p>\n<p>With those new structures, researchers found, came new properties for the wires. While Day and Mankin\u2019s study focused on the wires\u2019 ability to absorb different wavelengths of light, both said additional research is needed to explore other properties.<\/p>\n<p>\u201cThis paper is just one example,\u201d Day said. \u201cThere are many other properties \u2014 including thermal conductance, electrical conductance, and magnetic properties \u2014 that depend on the wires\u2019 diameter, and they still need to be explored.\u201d<\/p>\n<p>Though it may take years to fully explore those additional properties, Day and Mankin said applications for the new wires could emerge in the near term.<\/p>\n<p>\u201cStructures at this scale, because they are sub-wavelength in size, absorb light very efficiently,\u201d Day explained. \u201cThey act almost like optical antennas, and funnel the light into them. Previous research has shown that different diameter wires absorb different wavelengths of light. For example, very small diameters absorb blue light well, and larger diameters absorb green light. What we showed is if you have this modulation along the structure \u2026 we can have the best of both worlds and absorb both wavelengths on the same structure.\u201d<\/p>\n<p>The new wires\u2019 unusual light-absorption abilities don\u2019t end there, though.<\/p>\n<p>By shrinking the space between the crystalline structures, Day and Mankin discovered that the wires not only absorb light at specific wavelengths, they also absorb light from other parts of the spectrum.<\/p>\n<p>\u201cIt\u2019s actually more than a simple additive effect,\u201d Day said. \u201cAs you shrink the spacing down to distances smaller than about 400 nanometers, it creates what are called grating modes, and we see these huge absorption peaks in the infrared. What that means is that you could absorb the same amount of infrared light with these nanowires as you could with traditional silicon materials that are 100 times thicker.\u201d<\/p>\n<p>\u201cThis is a powerful discovery because previously, if you wanted to use nanowires for photo-detection of green and blue light, you\u2019d need two wires,\u201d Mankin said. \u201cNow we can shrink the amount of space a device might take up by having multiple functions in a single wire. We will be able to build smaller devices that still maintain high efficiency, and in some cases will take advantages of new properties that will emerge from this modulation that you don\u2019t have in uniform-diameter wires.\u201d<\/p>\n\n","innerContent":["\n\t\t<p>Harvard scientists have developed a first-of-its-kind method of creating a class of nanowires that one day could have applications in areas ranging from consumer electronics to solar panels.<\/p>\n<p>The technique, developed by Bobby Day and Max Mankin, graduate students working in the lab of <a href=\"http:\/\/www.seas.harvard.edu\/directory\/clieber\">Charles Lieber,<\/a> the Mark Hyman Jr. Professor of Chemistry, takes advantage of two long-understood principles. One is Plateau-Rayleigh instability, an aspect of fluid dynamics that describes why a thin stream of water breaks up into smaller droplets. The other involves crystal growth. The technique is described in a paper recently published in the journal Nature Nanotechnology.<\/p>\n<p>\u201cThis is really a fundamental discovery,\u201d Day said. \u201cWe\u2019re still in the early stages, but we think there is a lot of room for discovery, both of fundamental properties of these structures as well as applications.\u201d<\/p>\n<p>First described in 1870, Plateau-Rayleigh instability is normally associated with liquids, but researchers for years have recognized a similar phenomenon in nanowires. When heated to extreme temperatures, the wires transform from solid into a series of periodically spaced droplets.<\/p>\n<p>To create the new type of wire, Day and Mankin heated traditionally grown nanowires to just below that transformation point in a vacuum chamber, then pumped in silicon atoms, which spontaneously crystallize on the wire.<\/p>\n<p>Rather than form a uniform shell, the atoms grow into regularly spaced structures, similar to the droplets that appear when nanowires break down at high temperatures. Unlike with the droplets, though, the process can be tightly controlled.<\/p>\n<p>\u201cBy varying the temperature and pressure, we can exert some control over the size and spacing of these structures,\u201d Day said. \u201cWhat we found was if we change the conditions, we can \u2018tune\u2019 how these structures are built.\u201d<\/p>\n<p>Along with duplicating the process in nanowires between 20 and 100 nanometers in diameter, researchers demonstrated the process using several combinations of materials, including silicon and germanium. In addition to being able to \u201ctune\u201d the distance between the lobes on nanowires, Mankin said tests showed they were also able to tune the cross-section of the wires.<\/p>\n<p>\u201cWe can tune the cross-section to produce more rounded or square-type wires,\u201d Mankin said. \u201cWe were also able to produce wires with a platelet-like shape.\u201d<\/p>\n<p>With those new structures, researchers found, came new properties for the wires. While Day and Mankin\u2019s study focused on the wires\u2019 ability to absorb different wavelengths of light, both said additional research is needed to explore other properties.<\/p>\n<p>\u201cThis paper is just one example,\u201d Day said. \u201cThere are many other properties \u2014 including thermal conductance, electrical conductance, and magnetic properties \u2014 that depend on the wires\u2019 diameter, and they still need to be explored.\u201d<\/p>\n<p>Though it may take years to fully explore those additional properties, Day and Mankin said applications for the new wires could emerge in the near term.<\/p>\n<p>\u201cStructures at this scale, because they are sub-wavelength in size, absorb light very efficiently,\u201d Day explained. \u201cThey act almost like optical antennas, and funnel the light into them. Previous research has shown that different diameter wires absorb different wavelengths of light. For example, very small diameters absorb blue light well, and larger diameters absorb green light. What we showed is if you have this modulation along the structure \u2026 we can have the best of both worlds and absorb both wavelengths on the same structure.\u201d<\/p>\n<p>The new wires\u2019 unusual light-absorption abilities don\u2019t end there, though.<\/p>\n<p>By shrinking the space between the crystalline structures, Day and Mankin discovered that the wires not only absorb light at specific wavelengths, they also absorb light from other parts of the spectrum.<\/p>\n<p>\u201cIt\u2019s actually more than a simple additive effect,\u201d Day said. \u201cAs you shrink the spacing down to distances smaller than about 400 nanometers, it creates what are called grating modes, and we see these huge absorption peaks in the infrared. What that means is that you could absorb the same amount of infrared light with these nanowires as you could with traditional silicon materials that are 100 times thicker.\u201d<\/p>\n<p>\u201cThis is a powerful discovery because previously, if you wanted to use nanowires for photo-detection of green and blue light, you\u2019d need two wires,\u201d Mankin said. \u201cNow we can shrink the amount of space a device might take up by having multiple functions in a single wire. We will be able to build smaller devices that still maintain high efficiency, and in some cases will take advantages of new properties that will emerge from this modulation that you don\u2019t have in uniform-diameter wires.\u201d<\/p>\n\n"],"rendered":"\n\t\t<p>Harvard scientists have developed a first-of-its-kind method of creating a class of nanowires that one day could have applications in areas ranging from consumer electronics to solar panels.<\/p>\n<p>The technique, developed by Bobby Day and Max Mankin, graduate students working in the lab of <a href=\"http:\/\/www.seas.harvard.edu\/directory\/clieber\">Charles Lieber,<\/a> the Mark Hyman Jr. Professor of Chemistry, takes advantage of two long-understood principles. One is Plateau-Rayleigh instability, an aspect of fluid dynamics that describes why a thin stream of water breaks up into smaller droplets. The other involves crystal growth. The technique is described in a paper recently published in the journal Nature Nanotechnology.<\/p>\n<p>\u201cThis is really a fundamental discovery,\u201d Day said. \u201cWe\u2019re still in the early stages, but we think there is a lot of room for discovery, both of fundamental properties of these structures as well as applications.\u201d<\/p>\n<p>First described in 1870, Plateau-Rayleigh instability is normally associated with liquids, but researchers for years have recognized a similar phenomenon in nanowires. When heated to extreme temperatures, the wires transform from solid into a series of periodically spaced droplets.<\/p>\n<p>To create the new type of wire, Day and Mankin heated traditionally grown nanowires to just below that transformation point in a vacuum chamber, then pumped in silicon atoms, which spontaneously crystallize on the wire.<\/p>\n<p>Rather than form a uniform shell, the atoms grow into regularly spaced structures, similar to the droplets that appear when nanowires break down at high temperatures. Unlike with the droplets, though, the process can be tightly controlled.<\/p>\n<p>\u201cBy varying the temperature and pressure, we can exert some control over the size and spacing of these structures,\u201d Day said. \u201cWhat we found was if we change the conditions, we can \u2018tune\u2019 how these structures are built.\u201d<\/p>\n<p>Along with duplicating the process in nanowires between 20 and 100 nanometers in diameter, researchers demonstrated the process using several combinations of materials, including silicon and germanium. In addition to being able to \u201ctune\u201d the distance between the lobes on nanowires, Mankin said tests showed they were also able to tune the cross-section of the wires.<\/p>\n<p>\u201cWe can tune the cross-section to produce more rounded or square-type wires,\u201d Mankin said. \u201cWe were also able to produce wires with a platelet-like shape.\u201d<\/p>\n<p>With those new structures, researchers found, came new properties for the wires. While Day and Mankin\u2019s study focused on the wires\u2019 ability to absorb different wavelengths of light, both said additional research is needed to explore other properties.<\/p>\n<p>\u201cThis paper is just one example,\u201d Day said. \u201cThere are many other properties \u2014 including thermal conductance, electrical conductance, and magnetic properties \u2014 that depend on the wires\u2019 diameter, and they still need to be explored.\u201d<\/p>\n<p>Though it may take years to fully explore those additional properties, Day and Mankin said applications for the new wires could emerge in the near term.<\/p>\n<p>\u201cStructures at this scale, because they are sub-wavelength in size, absorb light very efficiently,\u201d Day explained. \u201cThey act almost like optical antennas, and funnel the light into them. Previous research has shown that different diameter wires absorb different wavelengths of light. For example, very small diameters absorb blue light well, and larger diameters absorb green light. What we showed is if you have this modulation along the structure \u2026 we can have the best of both worlds and absorb both wavelengths on the same structure.\u201d<\/p>\n<p>The new wires\u2019 unusual light-absorption abilities don\u2019t end there, though.<\/p>\n<p>By shrinking the space between the crystalline structures, Day and Mankin discovered that the wires not only absorb light at specific wavelengths, they also absorb light from other parts of the spectrum.<\/p>\n<p>\u201cIt\u2019s actually more than a simple additive effect,\u201d Day said. \u201cAs you shrink the spacing down to distances smaller than about 400 nanometers, it creates what are called grating modes, and we see these huge absorption peaks in the infrared. What that means is that you could absorb the same amount of infrared light with these nanowires as you could with traditional silicon materials that are 100 times thicker.\u201d<\/p>\n<p>\u201cThis is a powerful discovery because previously, if you wanted to use nanowires for photo-detection of green and blue light, you\u2019d need two wires,\u201d Mankin said. \u201cNow we can shrink the amount of space a device might take up by having multiple functions in a single wire. We will be able to build smaller devices that still maintain high efficiency, and in some cases will take advantages of new properties that will emerge from this modulation that you don\u2019t have in uniform-diameter wires.\u201d<\/p>\n\n"}],"innerHTML":"\n<div class=\"wp-block-group alignwide\">\n\n\n\n<\/div>\n","innerContent":["\n<div class=\"wp-block-group alignwide\">\n\n","\n\n<\/div>\n"],"rendered":"\n<div class=\"wp-block-group alignwide has-global-padding is-content-justification-center is-layout-constrained wp-block-group-is-layout-constrained\">\n\n\n\t\t<p>Harvard scientists have developed a first-of-its-kind method of creating a class of nanowires that one day could have applications in areas ranging from consumer electronics to solar panels.<\/p>\n<p>The technique, developed by Bobby Day and Max Mankin, graduate students working in the lab of <a href=\"http:\/\/www.seas.harvard.edu\/directory\/clieber\">Charles Lieber,<\/a> the Mark Hyman Jr. Professor of Chemistry, takes advantage of two long-understood principles. One is Plateau-Rayleigh instability, an aspect of fluid dynamics that describes why a thin stream of water breaks up into smaller droplets. The other involves crystal growth. The technique is described in a paper recently published in the journal Nature Nanotechnology.<\/p>\n<p>\u201cThis is really a fundamental discovery,\u201d Day said. \u201cWe\u2019re still in the early stages, but we think there is a lot of room for discovery, both of fundamental properties of these structures as well as applications.\u201d<\/p>\n<p>First described in 1870, Plateau-Rayleigh instability is normally associated with liquids, but researchers for years have recognized a similar phenomenon in nanowires. When heated to extreme temperatures, the wires transform from solid into a series of periodically spaced droplets.<\/p>\n<p>To create the new type of wire, Day and Mankin heated traditionally grown nanowires to just below that transformation point in a vacuum chamber, then pumped in silicon atoms, which spontaneously crystallize on the wire.<\/p>\n<p>Rather than form a uniform shell, the atoms grow into regularly spaced structures, similar to the droplets that appear when nanowires break down at high temperatures. Unlike with the droplets, though, the process can be tightly controlled.<\/p>\n<p>\u201cBy varying the temperature and pressure, we can exert some control over the size and spacing of these structures,\u201d Day said. \u201cWhat we found was if we change the conditions, we can \u2018tune\u2019 how these structures are built.\u201d<\/p>\n<p>Along with duplicating the process in nanowires between 20 and 100 nanometers in diameter, researchers demonstrated the process using several combinations of materials, including silicon and germanium. In addition to being able to \u201ctune\u201d the distance between the lobes on nanowires, Mankin said tests showed they were also able to tune the cross-section of the wires.<\/p>\n<p>\u201cWe can tune the cross-section to produce more rounded or square-type wires,\u201d Mankin said. \u201cWe were also able to produce wires with a platelet-like shape.\u201d<\/p>\n<p>With those new structures, researchers found, came new properties for the wires. While Day and Mankin\u2019s study focused on the wires\u2019 ability to absorb different wavelengths of light, both said additional research is needed to explore other properties.<\/p>\n<p>\u201cThis paper is just one example,\u201d Day said. \u201cThere are many other properties \u2014 including thermal conductance, electrical conductance, and magnetic properties \u2014 that depend on the wires\u2019 diameter, and they still need to be explored.\u201d<\/p>\n<p>Though it may take years to fully explore those additional properties, Day and Mankin said applications for the new wires could emerge in the near term.<\/p>\n<p>\u201cStructures at this scale, because they are sub-wavelength in size, absorb light very efficiently,\u201d Day explained. \u201cThey act almost like optical antennas, and funnel the light into them. Previous research has shown that different diameter wires absorb different wavelengths of light. For example, very small diameters absorb blue light well, and larger diameters absorb green light. What we showed is if you have this modulation along the structure \u2026 we can have the best of both worlds and absorb both wavelengths on the same structure.\u201d<\/p>\n<p>The new wires\u2019 unusual light-absorption abilities don\u2019t end there, though.<\/p>\n<p>By shrinking the space between the crystalline structures, Day and Mankin discovered that the wires not only absorb light at specific wavelengths, they also absorb light from other parts of the spectrum.<\/p>\n<p>\u201cIt\u2019s actually more than a simple additive effect,\u201d Day said. \u201cAs you shrink the spacing down to distances smaller than about 400 nanometers, it creates what are called grating modes, and we see these huge absorption peaks in the infrared. What that means is that you could absorb the same amount of infrared light with these nanowires as you could with traditional silicon materials that are 100 times thicker.\u201d<\/p>\n<p>\u201cThis is a powerful discovery because previously, if you wanted to use nanowires for photo-detection of green and blue light, you\u2019d need two wires,\u201d Mankin said. \u201cNow we can shrink the amount of space a device might take up by having multiple functions in a single wire. We will be able to build smaller devices that still maintain high efficiency, and in some cases will take advantages of new properties that will emerge from this modulation that you don\u2019t have in uniform-diameter wires.\u201d<\/p>\n\n\n\n<\/div>\n"}},"jetpack-related-posts":[{"id":116133,"url":"https:\/\/news.harvard.edu\/gazette\/story\/2012\/08\/merging-the-biological-electronic\/","url_meta":{"origin":169552,"position":0},"title":"Merging the biological, electronic","author":"harvardgazette","date":"August 26, 2012","format":false,"excerpt":"For the first time, Harvard scientists have created a type of cyborg tissue by embedding a 3-D network of functional, biocompatible, nanoscale wires into engineered human tissues.","rel":"","context":"In "Science & Tech"","block_context":{"text":"Science & Tech","link":"https:\/\/news.harvard.edu\/gazette\/section\/science-technology\/"},"img":{"alt_text":"","src":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2012\/08\/112105_lieber_350.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2012\/08\/112105_lieber_350.jpg?resize=350%2C200 1x, https:\/\/news.harvard.edu\/wp-content\/uploads\/2012\/08\/112105_lieber_350.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":171508,"url":"https:\/\/news.harvard.edu\/gazette\/story\/2015\/06\/injectable-electronics-promise-sharper-view-of-brain\/","url_meta":{"origin":169552,"position":1},"title":"Injectable device delivers nano-view of the brain","author":"harvardgazette","date":"June 8, 2015","format":false,"excerpt":"An international team of researchers has developed a method of fabricating nanoscale electronic scaffolds that can be injected via syringe. The scaffolds can then be connected to devices and used to monitor neural activity, stimulate tissues, or even promote regeneration of neurons.","rel":"","context":"In "Science & Tech"","block_context":{"text":"Science & Tech","link":"https:\/\/news.harvard.edu\/gazette\/section\/science-technology\/"},"img":{"alt_text":"","src":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2015\/06\/lieber_pressfigure2_605.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2015\/06\/lieber_pressfigure2_605.jpg?resize=350%2C200 1x, https:\/\/news.harvard.edu\/wp-content\/uploads\/2015\/06\/lieber_pressfigure2_605.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":2134,"url":"https:\/\/news.harvard.edu\/gazette\/story\/2006\/08\/nanowire-arrays-can-detect-signals-along-individual-neurons\/","url_meta":{"origin":169552,"position":2},"title":"Nanowire arrays can detect signals along individual neurons","author":"harvardgazette","date":"August 24, 2006","format":false,"excerpt":"Opening a whole new interface between nanotechnology and neuroscience, scientists at Harvard University have used slender silicon nanowires to detect, stimulate, and inhibit nerve signals along the axons and dendrites of live mammalian neurons.","rel":"","context":"In "Health"","block_context":{"text":"Health","link":"https:\/\/news.harvard.edu\/gazette\/section\/health\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":61743,"url":"https:\/\/news.harvard.edu\/gazette\/story\/2009\/10\/harvard-scientists-bend-nanowires-into-2-d-and-3-d-structures\/","url_meta":{"origin":169552,"position":3},"title":"Harvard scientists bend nanowires into 2-D and 3-D structures","author":"harvardgazette","date":"October 21, 2009","format":false,"excerpt":"Taking nanomaterials to a new level of structural complexity, Harvard researchers have determined how to introduce kinks into arrow-straight nanowires, transforming them into zigzagging two- and three-dimensional structures with correspondingly advanced functions. The work is described this week in in a letter in the journal Nature Nanotechnology by scientists led\u2026","rel":"","context":"In "Science & Tech"","block_context":{"text":"Science & Tech","link":"https:\/\/news.harvard.edu\/gazette\/section\/science-technology\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":27624,"url":"https:\/\/news.harvard.edu\/gazette\/story\/2009\/10\/nanowires-go-2-d-3-d\/","url_meta":{"origin":169552,"position":4},"title":"Nanowires go 2-D, 3-D","author":"harvardgazette","date":"October 22, 2009","format":false,"excerpt":"Taking nanomaterials to a new level of structural complexity, scientists have determined how to introduce kinks into arrow-straight nanowires, transforming them into zigzagging two- and three-dimensional structures with correspondingly advanced functions.","rel":"","context":"In "Health"","block_context":{"text":"Health","link":"https:\/\/news.harvard.edu\/gazette\/section\/health\/"},"img":{"alt_text":"","src":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2009\/10\/lieber_kinkednanowire21.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2009\/10\/lieber_kinkednanowire21.jpg?resize=350%2C200 1x, https:\/\/news.harvard.edu\/wp-content\/uploads\/2009\/10\/lieber_kinkednanowire21.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":280000,"url":"https:\/\/news.harvard.edu\/gazette\/story\/2019\/07\/harvard-researchers-present-nanowire-devices-update\/","url_meta":{"origin":169552,"position":5},"title":"Combing out a tangled problem","author":"Lian Parsons","date":"July 2, 2019","format":false,"excerpt":"A new technique speeds creation of nanowire devices, boosting research into what\u2019s happening inside cells.","rel":"","context":"In "Science & Tech"","block_context":{"text":"Science & Tech","link":"https:\/\/news.harvard.edu\/gazette\/section\/science-technology\/"},"img":{"alt_text":"Charles Lieber","src":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2019\/07\/062817_Lieber_1466.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/news.harvard.edu\/wp-content\/uploads\/2019\/07\/062817_Lieber_1466.jpg?resize=350%2C200 1x, https:\/\/news.harvard.edu\/wp-content\/uploads\/2019\/07\/062817_Lieber_1466.jpg?resize=525%2C300 1.5x, https:\/\/news.harvard.edu\/wp-content\/uploads\/2019\/07\/062817_Lieber_1466.jpg?resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/posts\/169552","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/users\/105622744"}],"replies":[{"embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/comments?post=169552"}],"version-history":[{"count":0,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/posts\/169552\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/media\/169554"}],"wp:attachment":[{"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/media?parent=169552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/categories?post=169552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/tags?post=169552"},{"taxonomy":"format","embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/gazette-formats?post=169552"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/news.harvard.edu\/gazette\/wp-json\/wp\/v2\/series?post=169552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}