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https://hdl.handle.net/2440/18128
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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 : journal of the European Optical Society, 2004; 6(8):S786-S795 |
Publisher: | IOP Publishing Ltd |
Issue Date: | 2004 |
ISSN: | 1464-4266 1741-3575 |
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 |
DOI: | 10.1088/1464-4266/6/8/025 |
Published version: | http://www.iop.org/EJ/abstract/1464-4266/6/8/025 |
Appears in Collections: | Aurora harvest 2 Environment Institute publications Physics publications |
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