{"id":95938,"date":"2019-04-04T22:53:45","date_gmt":"2019-04-05T02:53:45","guid":{"rendered":"https:\/\/www.ucf.edu\/news\/?p=95938"},"modified":"2019-07-03T12:57:54","modified_gmt":"2019-07-03T16:57:54","slug":"ucf-researchers-develop-way-control-speed-light-send-backward","status":"publish","type":"post","link":"https:\/\/www.ucf.edu\/news\/ucf-researchers-develop-way-control-speed-light-send-backward\/","title":{"rendered":"UCF Researchers Develop Way to Control Speed of Pulses of Light, Send Them Backward"},"content":{"rendered":"<p>UCF researchers have developed a way to control the speed of pulses of light. Not only can they speed up a pulse of light and slow it down, they can also make it travel backward.<\/p>\n<p>The results were published recently in the journal <a href=\"https:\/\/www.nature.com\/articles\/s41467-019-08735-8\"><em>Nature Communications<\/em><\/a>. The achievement is groundbreaking, but the study authors caution that the findings do not violate Einstein\u2019s theory of special relativity that says the speed of light is constant.<\/p>\n<p>The pulses comprise many colors, or wavelengths, each of which travels at the speed of light, but when combined produce a pulse whose peak travels at any desired speed, known as the group velocity. Such a pulse can be useful in many applications, such as helping to control the flow of information, but cannot transmit information at a speed higher than that of light.<\/p>\n<p>This achievement is a major step in research that could one day lead to more efficient optical communication, as the technique could be used to alleviate data congestion and prevent information loss. And with more and <a href=\"http:\/\/iot.cecs.ucf.edu\/\">more devices coming online<\/a> and data transfer rates becoming higher, this sort of control will be necessary.<\/p>\n<p>Previous attempts at controlling the speed of light have included passing light through various materials to adjust its speed. The new technique, however, allows the speed to be adjusted for the first time in the open, without using any pass-through material to speed it up or slow it down.<\/p>\n<p>\u201cThis is the first clear demonstration of controlling the speed of a pulse light in free space,\u201d said study co-author Ayman Abouraddy, a professor of <a href=\"https:\/\/www.ucf.edu\/degree\/optics-and-photonics-ms\/\">optics<\/a>. \u201cAnd it opens up doors for many applications, an optical buffer being just one of them, but most importantly it\u2019s done in a simple way, that\u2019s repeatable and reliable.\u201d<\/p>\n<p>Abouraddy and study co-author <strong>Esat Kondakci \u201915<\/strong> demonstrated they could speed a pulse of light up to 30 times the speed of light, slow it down to half the speed of light, and also make the pulse travel backward.<\/p>\n<p>The researchers were able to develop the technique by using a special device known as a spatial light modulator to mix the space and time properties of light, thereby allowing them to control the group velocity of the pulse of light, which is roughly the speed at which the peak of the pulse travels. The mixing of the two properties was key to the technique\u2019s success.<\/p>\n<p>\u201cWe\u2019re able to control the speed of the pulse by going into the pulse itself and reorganizing its energy such that its space and time degrees of freedom are mixed in with each other,\u201d Abouraddy said.<\/p>\n<p>\u201cWe\u2019re very happy with these results, and we\u2019re very hopeful it\u2019s just the starting point of future research,\u201d he said.<\/p>\n<p>Kondakci earned a <a href=\"https:\/\/www.ucf.edu\/degree\/optics-and-photonics-phd\/\">PhD in optics and photonics<\/a> from UCF. He was a postdoctoral research fellow at UCF before moving to Purdue 海角直播 where he is also a postdoctoral research fellow.<\/p>\n<p>Abouraddy received his <a href=\"https:\/\/www.ucf.edu\/degree\/electrical-engineering-phd\/\">doctorate in electrical engineering<\/a> from Boston 海角直播 and worked as a postdoctoral researcher at the Massachusetts Institute of Technology. He joined UCF in 2008.<\/p>\n<p>The research was supported with funding from the U.S. Office of Naval Research.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The achievement is a major step in research that could one day lead to more efficient optical communication, as the technique could be used to alleviate data congestion and prevent information loss. <\/p>\n","protected":false},"author":16,"featured_media":95939,"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":[5,23,24],"tags":[981,1112,14916],"tu_author":[],"class_list":["post-95938","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-colleges","category-research","category-science-technology","tag-college-of-optics-and-photonics","tag-creol","tag-research"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>UCF Researchers Develop Way to Control Speed of Pulses of Light, Send Them Backward | 海角直播 News<\/title>\n<meta name=\"description\" content=\"The achievement is a major step in research that could one day 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content=\"https:\/\/www.ucf.edu\/news\/ucf-researchers-develop-way-control-speed-light-send-backward\/\" \/>\n<meta property=\"og:site_name\" content=\"海角直播 News | UCF Today\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/UCF\" \/>\n<meta property=\"article:published_time\" content=\"2019-04-05T02:53:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-07-03T16:57:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ucf.edu\/wp-content\/blogs.dir\/20\/files\/2019\/04\/SPEEDlight_50276671.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Zenaida Kotala\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@UCF\" \/>\n<meta name=\"twitter:site\" content=\"@UCF\" \/>\n<meta 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