{"id":9887,"date":"2014-05-13T13:50:53","date_gmt":"2014-05-13T17:50:53","guid":{"rendered":"http:\/\/news.cos.ucf.edu\/?p=9887"},"modified":"2024-04-23T12:34:48","modified_gmt":"2024-04-23T16:34:48","slug":"ucf-physicist-gets-three-big-journal-hits-in-one-year","status":"publish","type":"post","link":"https:\/\/sciences.ucf.edu\/news\/ucf-physicist-gets-three-big-journal-hits-in-one-year\/","title":{"rendered":"UCF Physicist Gets Three Big Journal Hits in One Year"},"content":{"rendered":"
\n
\"Dr.<\/a>
Dr. Zenghu Chang<\/figcaption><\/figure>\n<\/div>\n\n\n

University of Central Florida physicist Zenghu Chang has done it again. For a third time this year, his research group has published an article in a Nature journal.<\/p>\n\n\n\n

This time, Chang and his team have developed a new ultrafast light source for observing electron motion in molecules \u2013 made up of nuclei and electrons \u2013 at the point before the nuclei start to move. By being able to observe what actually happens, scientists can begin to understand how an electron interacts with other electrons, which may help improve the efficiency of solar cells.<\/p>\n\n\n\n

\u201cThe charge migration that theorists have been predicting since 1999 happens so quickly we haven\u2019t been able to observe it yet,\u201d Chang said. \u201cIt\u2019s very exciting, because we have found a new way to build light sources that may allow us to see it in the future.\u201d<\/p>\n\n\n\n

Being able to see this superfast interaction between electrons gives scientists another tool to unlock the rules that govern the quantum-mechanics world \u2013 a world where microscopic objects don\u2019t obey the laws of physics we have come to rely on for understanding in the larger world.<\/p>\n\n\n\n

So how did Chang and his team manage to develop the new light source? The team borrowed an idea from Chang\u2019s earlier innovative work<\/a> in the area of ultrafast lasers.<\/p>\n\n\n\n

\u201cWe control the below-threshold harmonic light emission by using electromagnetic fields with time-dependent ellipticity, like we have done to the above-threshold high-order harmonics,\u201d said Chang referring to the creation of a 67-attosecond pulse of extreme ultraviolet light, which earned him international recognition. \u201cWe thought: Could we use the same gating fields to show the dependence of the below-threshold harmonic intensity on the carrier-envelope phase of the driving laser? It took us some time to find the right experimental parameters, but the answer is yes.\u201d<\/p>\n\n\n\n

The result of his study \u201cCoherent phase-matched VUV generation by field-controlled bound states\u201d appears this week in Nature Photonics<\/a>.<\/p>\n\n\n\n

Chang has been studying light and ultrafast lasers his entire career. This past year UCF established the Institute for the Frontier of Attosecond Science and Technology (FAST)<\/a>. The institute is a collaboration between experts and students in UCF\u2019s College of Optics and Photonics (CREOL) and the College of Sciences\u2019 physics department to focus on this field of science. Chang has a joint appointment in CREOL.<\/p>\n\n\n\n

Co-authors include: Michael Chini, Xiaowei Wang, Yan Cheng, Yi Wu and Eric Cunningham from UCF\u2019s FAST; Peng-Cheng Li, John Heslar and Shih-I Chu from the Center for Quantum Science and Engineering and the Department of Physics at the National Taiwan University; He Wang from the Materials Sciences Division at the Lawrence Berkeley National Laboratory, and Dmitry A. Telnovfrom the Department of Physics at St. Petersburg State University in Russia.<\/p>\n\n\n\n

\u201cIt was truly a collaborative effort,\u201d Chang said. \u201cAnd there are certainly commercial applications. We\u2019re talking about cutting-edge lasers with potential application in electronics, navigation, communications and medicine.\u201d<\/p>\n\n\n\n

Chang said he is excited about the new work because he hopes it will help lead to bigger and greater discoveries.<\/p>\n\n\n\n

To see other 2014 Nature Photonics articles click here<\/a> and here<\/a>.<\/p>\n\n\n\n

\u201cMy dream is to discover new physics that has not been predicted at this time,\u201d Chang said. \u201cUntil there was a microscope, we had no idea how complicated, how amazing cells were. What we are creating now are tools for magnifying time in order to discover what we have not even imagined yet. That\u2019s what I see for the future of our field.\u201d<\/p>\n\n\n\n

The Defense Advanced Research Projects Agency, National Science Foundation, U.S. Department of Energy, National Science Council of Taiwan and National Taiwan University funded the research.<\/p>\n","protected":false},"excerpt":{"rendered":"

University of Central Florida physicist Zenghu Chang has done it again. For a third time this year, his research group has published an article in a Nature journal. This time, Chang and his team have developed a new ultrafast light source for observing electron motion in molecules \u2013 made up of nuclei and electrons \u2013 […]<\/p>\n","protected":false},"author":125,"featured_media":9889,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[38,13,14],"tags":[360,735,736,815,1136,2007,2275,2440,2686,2801,2997,3457,3723,6459,6460,4926,3935],"class_list":["post-9887","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-breaking-news","category-news","category-physics-departments","tag-attosecond","tag-college-of-optics-and-photonics","tag-college-of-sciences","tag-creol","tag-electron-motion","tag-laser","tag-michael-chini","tag-nature","tag-physics","tag-quantum-mechanics","tag-scientific-journal","tag-ucf","tag-university-of-central-florida","tag-xiaowei-wang","tag-yan-wang","tag-yi-wu","tag-zenghu-chang"],"yoast_head":"\nUCF Physicist Gets Three Big Journal Hits in One Year - College of Sciences News<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sciences.ucf.edu\/news\/ucf-physicist-gets-three-big-journal-hits-in-one-year\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UCF Physicist Gets Three Big Journal Hits in One Year - College of Sciences News\" \/>\n<meta property=\"og:description\" content=\"University of Central Florida physicist Zenghu Chang has done it again. 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