Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/35272
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Type: Conference paper
Title: Retrofittable T-ray antireflection coatings
Author: Withayachumnankul, W.
Fischer, B.
Mickan, S.
Abbott, D.
Citation: Micro- and nanotechnology : materials, processes, packaging, and systems III : 11-13 December 2006, Adelaide, Australia / Jung-Chih Chiao (ed.), pp. 64150N 1-17
Publisher: SPIE
Publisher Place: USA
Issue Date: 2006
Series/Report no.: Proceedings of SPIE--the International Society for Optical Engineering ; 6415.
ISBN: 0819465232
9780819465238
ISSN: 0277-786X
1996-756X
Conference Name: Smart Materials, Nano- and Micro-Smart Systems (10 Dec 2006 - 13 Dec 2006 : Adelaide, Australia)
Editor: Chiao, J.C.
Dzurak, A.S.
Jagadish, C.
Thiel, D.V.
Statement of
Responsibility: 
W. Withayachumnankul, B. M. Fischer, S. P. Mickan, and D. Abbott
Abstract: Terahertz time-domain spectroscopy (THz-TDS) is able to extract optical or dielectric properties of materials, whether in the solid, liquid, or gas phase, in the T-ray frequency region. Spectroscopy of a liquid or gas often requires a receptacle to confine the sample. In order to allow T-rays to probe the sample effectively, the receptacle must have T-ray transparent windows. However, even though windows are transparent to T-rays, attenuation exists, because of multiple reflections at air-window and window-air interfaces, which accounts for a major energy loss. Due to the recent emergence of T-ray technology, there has been very little work carried out to-date on the reduction of reflection losses. This paper analyses the reduction of T-ray reflection loss by means of an antireflection coating. Because T-ray wavelengths are much larger than visible wavelengths, the antireflection layer thickness for T-rays is much larger than the usual optical case. This creates an interesting opportunity for retrofittable antireflection layers in T-ray systems. In the experiment, a coating material made from polyethylene sheets is applied onto the surfaces of a silicon window. The coated window shows enhancement of the transmittance within a range of frequencies.
Description: © 2006 COPYRIGHT SPIE--The International Society for Optical Engineering
DOI: 10.1117/12.695949
Grant ID: ARC
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Electrical and Electronic Engineering publications

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