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Type: Journal article
Title: Low noise laser-based T-ray spectroscopy of liquids using double-modulated differential time-domain spectroscopy
Author: Mickan, S.
Shvartsman, R.
Munch, J.
Zhang, X.
Abbott, D.
Citation: Journal of Optics B-Quantum and Semiclassical Optics, 2004; 6(8):S786-S795
Publisher: IOP Publishing Ltd
Issue Date: 2004
ISSN: 1464-4266
Abstract: Liquid transmission studies at terahertz frequencies (0.1–10 THz) are valuable for understanding solvation dynamics of salts, exploring long-range structure in mixtures and probing biomolecules in suspension. T-ray (or THz) time-domain spectroscopy, based on terahertz pulse generation from ultrafast lasers, is a sensitive technique for measuring material parameters in this frequency range. This paper proposes and demonstrates a novel technique for increasing the sensitivity and repeatability of liquid studies with T-ray time-domain spectroscopy (TDS), reducing relative parameter measurement errors below 0.0001. The proposed technique combines dual-thickness liquid measurement with rapid modulation (double-modulated differential TDS) to reduce the effect of both thickness-measurement errors and T-ray noise errors below 0.0001. The possible reduction in error is calculated and a liquid differential TDS (DTDS) prototype is demonstrated, incorporating amplitude and mean detection for near-simultaneous measurement of two T-ray waveforms.
Description: Copyright © Institute of Physics and IOP Publishing
RMID: 0020041189
DOI: 10.1088/1464-4266/6/8/025
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Appears in Collections:Physics publications
Environment Institute publications

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