太赫兹辐射
光学整流
材料科学
光电子学
激光器
光电流
纳米线
线极化
光学
极化(电化学)
通量
非线性光学
物理
物理化学
化学
作者
Fugang Xi,He Yang,Vladislav Khayrudinov,Yuhang He,Tuomas Haggrén,Yixuan Zhou,Harri Lipsanen,Zhipei Sun,Xinlong Xu
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2021-12-03
卷期号:33 (8): 085207-085207
被引量:4
标识
DOI:10.1088/1361-6528/ac3948
摘要
The development of powerful terahertz (THz) emitters is the cornerstone for future THz applications, such as communication, medical biology, non-destructive inspection, and scientific research. Here, we report the THz emission properties and mechanisms of mushroom-shaped InAs nanowire (NW) network using linearly polarized laser excitation. By investigating the dependence of THz signal to the incidence pump light properties (e.g. incident angle, direction, fluence, and polarization angle), we conclude that the THz wave emission from the InAs NW network is induced by the combination of linear and nonlinear optical effects. The former is a transient photocurrent accelerated by the photo-Dember field, while the latter is related to the resonant optical rectification effect. Moreover, thep-polarized THz wave emission component is governed by the linear optical effect with a proportion of ∼85% and the nonlinear optical effect of ∼15%. In comparison, thes-polarized THz wave emission component is mainly decided by the nonlinear optical effect. The THz emission is speculated to be enhanced by the localized surface plasmon resonance absorption of the In droplets on top of the NWs. This work verifies the nonlinear optical mechanism in the THz generation of semiconductor NWs and provides an enlightening reference for the structural design of powerful and flexible THz surface and interface emitters in transmission geometry.
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