{"id":93157,"date":"2018-12-17T07:35:53","date_gmt":"2018-12-17T12:35:53","guid":{"rendered":"https:\/\/www.ucf.edu\/news\/?p=93157"},"modified":"2019-07-08T11:37:40","modified_gmt":"2019-07-08T15:37:40","slug":"ucf-researchers-develop-method-hide-images-information-plain-sight","status":"publish","type":"post","link":"https:\/\/www.ucf.edu\/news\/ucf-researchers-develop-method-hide-images-information-plain-sight\/","title":{"rendered":"UCF Researchers Develop Method to Hide Images and Information in Plain Sight"},"content":{"rendered":"<p>What is real is not always as it appears. UCF researchers have found a way to hide information on materials and only make it visible to a person using the right tech.<\/p>\n<p>\u201cWe found we can create a surface where we preferentially control absorption of light,\u201d says Debashis Chanda, an associate professor of physics, optics and nanoscience who has developed the technique.<\/p>\n<p>The findings were published recently in the <em>Nature<\/em> journal <em>Light: Science &amp; Applications<\/em>.<\/p>\n<p>The trick is to put the information on a surface that is riddled with nanoscale patterns, which can fool the naked eye by reflecting only a solid color rather than the intended information. To get the intended information, a person must look through an infrared lens or camera tuned to the correct infrared band.<\/p>\n<blockquote><p>The information can also be changed so that the secret messages invisible to the human eye can appear and reappear.<\/p><\/blockquote>\n<p>And not only can information be hidden this way, the information can also be changed so that the secret messages invisible to the human eye can appear and reappear. These further developments were published recently as a cover article in the journal <em>ACS Photonics<\/em>.<\/p>\n<p>The applications for this technology could include anticounterfeiting security, infrared tagging or infrared camouflages where, for instance, the presence of a designer label could be confirmed with a look through an infrared camera. It also has military applications, such as confirming which assets are friendly and which are enemy by tags on their surfaces that are only visible in a specific infrared band or by dynamically changing the information for infrared camouflage.<\/p>\n<figure id=\"attachment_93184\" style=\"max-width: 1200px;\" class=\"figure\"><noscript><img decoding=\"async\" width=\"1200\" height=\"801\" class=\"figure-img size-full img-fluid w-100 wp-image-93184\" src=\"https:\/\/www.ucf.edu\/news\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared.jpg\" alt=\"Two men stand side by side, the one on the left wears a lab coat and blue gloves and holds a small computer chip toward the camera\" srcset=\"https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared.jpg 1200w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-300x200.jpg 300w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-768x512.jpg 768w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-1199x800.jpg 1199w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-599x400.jpg 599w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-360x240.jpg 360w\" sizes=\"(max-width: 1200px) 100vw, 1200px\"><\/noscript><img decoding=\"async\" width=\"1200\" height=\"801\" class=\"figure-img size-full img-fluid w-100 wp-image-93184 lazyload\" src=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201200%20801%22%3E%3C%2Fsvg%3E\" alt=\"Two men stand side by side, the one on the left wears a lab coat and blue gloves and holds a small computer chip toward the camera\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201200%20801%22%3E%3C%2Fsvg%3E 1200w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" data-srcset=\"https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared.jpg 1200w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-300x200.jpg 300w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-768x512.jpg 768w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-1199x800.jpg 1199w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-599x400.jpg 599w, https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared-360x240.jpg 360w\" data-src=\"https:\/\/www.ucf.edu\/news\/wp-content\/blogs.dir\/20\/files\/2018\/12\/ucf-infrared.jpg\"><figcaption class=\"figure-caption\">Associate Professor Debashis Chanda and Postdoctoral Fellow Sayan Chandra&#8217;s findings were published recently in the <em>Nature<\/em> journal <em>Light: Science &amp; Applications<\/em>.<\/figcaption><\/figure>\n<p>In the <em>Light: Science &amp; Applications<\/em> study, the researchers demonstrated that they can hide images within the infrared spectrum while the same area appears as a solid color in the visible spectrum.<\/p>\n<p>To do so, they created a three-level, layered, \u201cplasmonic\u201d system that sandwiches a polymer layer imprinted with nanoscale holes, between a gold mirror at the bottom and a gold layer at the top with holes that match the polymer layer.<\/p>\n<p>Images can be imprinted on top of the \u201cplasmonic sandwich,\u201d and aspects of the holes, such as size and depth, help dictate which infrared band the image can be seen in. Without looking through an infrared camera tuned to the right band, the top of the device looks like a solid color, such as a yellow square, thanks to the unique properties that can be achieved with materials at the nanoscale.<\/p>\n<p>Varying the pattern characteristics allows the researchers to control the electron plasma resonance, or the electric energy, created when light hits the device.<\/p>\n<p>\u201cSo by controlling this electron plasma resonance we can actually control which color of light or which band of light is absorbed and reflected,\u201d Chanda says.<\/p>\n<blockquote><p>&#8220;We can actually control which color of light or which band of light is absorbed and reflected.\u201d \u2014 Debashis Chanda, UCF associate professor<\/p><\/blockquote>\n<p>In the <em>ACS Photonics<\/em> study, the researchers went a step further and developed a way to erase and display the image in selected infrared bands.<\/p>\n<p>They did this by adding a layer of phase change material vanadium dioxide within the \u201cplasmonic sandwich\u201d that dynamically changes the light reflection from the surface from 100 to 0 percent and back as the phase change is triggered.<\/p>\n<p>\u201cIt provides an additional element of dynamic tunability where the coded information is concealed or revealed to infrared cameras,\u201d Chanda says.<\/p>\n<p>Co-authors of the <em>Light: Science &amp; Applications<\/em> study were Daniel Franklin \u201918PhD, now a postdoctoral fellow at Northwestern University; Sushrut Modak \u201914MS \u201918PhD, who recently graduated from UCF\u2019s <a href=\"https:\/\/www.ucf.edu\/degree\/physics-phd\/\">physics doctoral program<\/a>; Abraham V\u00e1zquez-Guardado \u201916MS \u201918PhD, a postdoctoral fellow in UCF\u2019s Nano-Optics Group; and Alireza Safaei \u201918MS, a physics PhD. student.<\/p>\n<p>Co-authors of the <em>ACS Photonics<\/em> study were Sayan Chandra, a postdoctoral fellow in UCF\u2019s Nano-Optics Group; Daniel Franklin; Jared Cozart, an undergraduate honors student majoring in <a href=\"https:\/\/www.ucf.edu\/degree\/photonic-science-and-engineering-bspse\/\">photonics<\/a>; and Alireza Safaei \u201918, a PhD physics student.<\/p>\n<p>The research was funded by the National Science Foundation and Northrop Grumman Mission Systems\u2019 University Research Program.<\/p>\n<p>Chanda received his PhD in photonics from the University of Toronto and worked as a postdoctoral fellow at the University of Illinois at Urbana-Champaign. He joined UCF in 2012.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The applications for this technology could include anticounterfeiting security or military tactics. <\/p>\n","protected":false},"author":98,"featured_media":93179,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"lazy_load_responsive_images_disabled":false,"footnotes":"","_links_to":"","_links_to_target":"","_wp_rev_ctl_limit":""},"categories":[23,24],"tags":[11131,5390,3715,14916],"tu_author":[],"class_list":["post-93157","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","category-science-technology","tag-debashis-chanda","tag-optics-and-photonics","tag-physics","tag-research"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>UCF Researchers Develop Method 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