Evolution of terahertz conductivity in ZnSe nanocrystal investigated with optical-pump terahertz-probe spectroscopy

被引：0
|
作者：
Gaofang Li
Xin Xue
Xian Lin
Sannan Yuan
Naiyun Tang
Fenghong Chu
Haoyang Cui
Guohong Ma
机构：
[1] Shanghai University of Electric Power,Laboratory of Ultrafast Photonics, Department of Physics
[2] Shanghai University,Laboratory for Microstructures
[3] Shanghai University,undefined
来源：
Applied Physics A | 2014年 / 116卷
关键词：
ZnSe; Laser Pulse Excitation; Biexponential Decay; ZnSe Nanoparticles; ZnSe Nanocrystal;
D O I：
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中图分类号：
学科分类号：
摘要：
Ultrafast carrier dynamics and terahertz conductivity of ZnSe nanocrystal are investigated by means of the optical-pump terahertz-probe spectroscopy at room temperature. With the laser pulse excitation at 400 nm, the negative transmission of terahertz pulse shows an ultrafast rising followed by a biexponential recovery. The fast decay component with time constant of 5 ps is dominated by the photocarriers backscattering at interfaces of ZnSe nanoparticles, and the slow one with time constant longer than 1 ns can be assigned to the carrier recombination from band-to-band transition. The evolution of conductivity with time demonstrates that this kind of nanostructure is a good candidate for fabricating ultrafast terahertz switching.
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页码：45 / 50
页数：5
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