Open AccessThe property of third-order optical nonlinear susceptibility of water soluble CdTe quantum dots
Author(s) -
Wu Wen-Zhi,
Zheng Zhi-Ren,
Qinhan Jin,
Yunjun Yan,
Weilong Liu,
Jianping Zhang,
Yang Yan-Qiang,
Su Wen-Hui
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.1177
Subject(s) - quantum dot , materials science , femtosecond , ultrashort pulse , picosecond , cadmium telluride photovoltaics , transmittance , kerr effect , absorption (acoustics) , optoelectronics , laser , photonics , z scan technique , free carrier absorption , optics , nonlinear optics , nonlinear system , physics , semiconductor , quantum mechanics , composite material
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 32 times greater than that of the standard CS2 liquid Kerr medium.