Design and performance of reflective terahertz air-biased-coherent-detection for time-domain spectroscopy

被引：92

作者：

Ho, I-Chen ^{[1
]}

Guo, Xiaoyu ^{[1
]}

Zhang, X. -C. ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Ctr Terahertz Res, Troy, NY 12180 USA

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 03期

基金：

美国国家科学基金会;

关键词：

THZ; SUBPICOSECOND; PULSES; RECTIFICATION; GENERATION; SILICON; WATER;

D O I：

10.1364/OE.18.002872

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

When a sample being tested is optically opaque or has a high absorption coefficient, a reflective measurement is often more suitable than a transmission measurement. We report the design and evaluation of a reflective terahertz time-domain spectroscopy (R-THz-TDS), using air as THz wave emitter and sensor, together with air-biased-coherent-detection (ABCD) method for the first time. With an 85 fs pulse amplified laser, we demonstrate a usable bandwidth from 0.5 THz to 12 THz, together with a peak dynamic range (DR) better than 2000:1 and a peak THz electrical field greater than 30 kV/cm. With a 32 fs pulse amplified laser, the usable bandwidth is remarkably expanded to a continuous 35 THz. Several far-infrared optical properties in various samples are reported. Furthermore, the time-resolved optical pump-THz probe experiment is performed. Finally, the uniqueness and advantage of this spectrometer are comprehensively compared with traditional THz-TDS and Fourier transform infrared (FTIR) spectroscopy. (C) 2010 Optical Society of America

引用

页码：2872 / 2883

页数：12

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