Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/47303
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Type: Journal article
Title: Material thickness optimization for transmission-mode terahertz time-domain spectroscopy
Author: Withayachumnankul, W.
Fischer, B.
Abbott, D.
Citation: Optics Express, 2008; 16(10):7382-7396
Publisher: Optical Soc Amer
Issue Date: 2008
ISSN: 1094-4087
1094-4087
Statement of
Responsibility: 
WithawatWithayachumnankul, Bernd M. Fischer, and Derek Abbott
Abstract: The thickness of a sample material for a transmission-mode terahertz time-domain spectroscopy (THz-TDS) measurement is the subject of interest in this paper. A sample that is too thick or too thin can raise the problem of measurement uncertainty. Although greater thickness allows the terahertz radiation - or T-rays - to interact more with bulk material, the SNR rolls off with thickness due to signal attenuation. A sample that is too thin renders itself nearly invisible to T-rays, in such a way that the system can hardly sense the difference between the sample and a free space path. The optimal trade-off is analyzed and revealed in this paper, where our approach is to find the optimal thickness that results in the minimal uncertainty of measured optical constants. The derived model for optimal thickness is supported by the results from experiments performed with polyvinyl chloride (PVC), high-density polyethylene (HDPE), and lactose samples.
Keywords: Polyethylene; Polyvinyl Chloride; Lactose; Models, Statistical; Monte Carlo Method; Reproducibility of Results; Optics and Photonics; Chemistry, Physical; Algorithms; Stress, Mechanical; Time Factors; Equipment Design; Spectrophotometry
Rights: Copyright © 2008 Optical Society of America
RMID: 0020080871
DOI: 10.1364/OE.16.007382
Appears in Collections:Electrical and Electronic Engineering publications

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