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Ultrafast non-linear optical properties of Ge20As25Se55 chalcogenide films |
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| Authors: | Qiming Liu Bing Lu Fuxi Gan Jun Mi |
| Affiliation: | a Key Laboratory of Silicate Materials Science and Engineering Wuhan University of Technology, Ministry of Education, Luoshi Road 122, Hongshan District, Wuhan, Hubei 430070, PR China b International School of Software of Wuhan University, Wuhan, Hubei 430072, PR China c Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, PR China d School of Information Sciences and Engineering, Fudan University, Shanghai 200433, PR China e Department of Physics, Fudan University, Shanghai 200433, PR China |
| Abstract: | The non-resonant third-order non-linear optical properties of amorphous Ge20As25Se55 films were studied experimentally by the method of the femtosecond optical heterodyne detection of optical Kerr effect. The real and imaginary parts of complex third-order optical non-linearity could be effectively separated and their values and signs could be also determined, which were 6.6 × 10−12 and −2.4 × 10−12 esu, respectively. Amorphous Ge20As25Se55 films showed a very fast response in the range of 200 fs under ultrafast excitation. The ultrafast response and large third-order non-linearity are attributed to the ultrafast distortion of the electron orbitals surrounding the average positions of the nucleus of Ge, As and Se atoms. The high third-order susceptibility and a fast response time of amorphous Ge20As25Se55 films makes it a promising material for application in advanced techniques especially in optical switching. |
| Keywords: | 78.66.J 42.65.R 33.55.F |
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