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《Acta Physica Sinica》 2008-02
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The property of third-order optical nonlinear susceptibility ofwater soluble CdTe quantum dots

Wu Wen-Zhi1) Zheng Zhi-Ren1) Jin Qin-Han2) Yan Yu-Xi2) Liu Wei-Long2) Zhang Jian-Ping1)3)Yang Yan-Qiang2) Su Wen-Hui2)1)(Center for Condensed Matter Science and Technology, Harbin Institute of Technology, Harbin 150001,China)2)(Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China)3)(Department of Chemistry, Renmin University of China, Beijing 100872, China)  
The property of optical nonlinear susceptibility of the CdTe quantum dots (QDs) has been studied by using Z-scan and optical Kerr effect technique. Laser-induced sign reversal of the nonlinear refractive index of CdTe quantum dots appears under femtosecond and picosecond pulse excitation. Two-phonon absorption and free carrier absorption in the nanometer-sized CdTe are the possible origins of the nonlinear absorption. This material has the ultrafast response time of less than 400 fs in optical switching operation, and the peak Kerr transmittance is found to be 3.2 times greater than that of the standard CS_2 liquid Kerr medium.
【Fund】: 国家自然科学基金(批准号:10774034 10674034 60478015)资助的课题.~~
【CateGory Index】: O437
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