Exploration of PtSe2 Thin Film Based on Time-resolved Terahertz Spectroscopy

被引：0
|
作者：
Dai Zijie [1 ,2 ,4 ]
Kang Lixing [3 ]
Gong Cheng [1 ,2 ]
Liu Zheng [3 ]
Liu Weiwei [1 ,2 ]
机构：
[1] Nankai Univ, Inst Modern Opt, Tianjin 300350, Peoples R China
[2] Tianjin Key Lab Microscale Opt Hybrmat Sci & Tech, Tianjin 300350, Peoples R China
[3] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore
[4] Jiangsu Univ, Inst Micronano Optoelect & Terahertz Technol, Zhenjiang 212013, Jiangsu, Peoples R China
来源：
ACTA PHOTONICA SINICA | 2021年 / 50卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Terahertz; Time-resolved; Ultrafast; Platinum selenide; Terahertz modulation; WAVE-GUIDE; CONDUCTIVITY;
D O I：
10.3788/gzxb20215008.0850206
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Utilizing the time-resolved terahertz spectroscopy,the optical property of platinum selenide (PtSe2) thin films with different thicknesses in terahertz band are investigated experimentally. As the applied pump fluences increase from 0 to 2 540 mu J/cm(2),the conductivity of 11 nm-PtSe2 film increases and further leading to the attenuation of the transmitted terahertz wave. Conversely,the conductivity of 197 nm-PtSe2 film decreases with the enhanced pump fluences that induces the increase of the transmitted terahertz wave. These characters enable PtSe2 thin film to be a photoactive terahertz modulator, which shows an ultrafast (similar to 14 ps) and broadband (0.2 similar to 1.8 THz) modulation (15%similar to 35%) of terahertz waves. The research provides a potential PtSe2-based platform to the active and ultrafast photonic devices at terahertz frequencies.
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页数：8
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