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The property of third-order optical nonlinear susceptibility of water soluble CdTe quantum dots

Wu Wen-Zhi Zheng Zhi-Ren Liu Wei-Long Yang Yan-Qiang Su Wen-Hui Zhang Jian-Ping Jin Qin-Han Yan Yu-Xi

The property of third-order optical nonlinear susceptibility of water soluble CdTe quantum dots

Wu Wen-Zhi, Zheng Zhi-Ren, Liu Wei-Long, Yang Yan-Qiang, Su Wen-Hui, Zhang Jian-Ping, Jin Qin-Han, Yan Yu-Xi
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  • Received Date:  21 May 2007
  • Accepted Date:  22 June 2007
  • Published Online:  20 February 2008

The property of third-order optical nonlinear susceptibility of water soluble CdTe quantum dots

  • 1. (1)哈尔滨工业大学,凝聚态科学与技术研究中心,哈尔滨 150001; (2)哈尔滨工业大学,凝聚态科学与技术研究中心,哈尔滨 150001;中国人民大学化学系,北京 100872; (3)吉林大学,化学学院微分析仪器研究所,长春 130021

Abstract: 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 CS2 liquid Kerr medium.

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