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Proceedings Paper

Retrofittable T-ray antireflection coatings
Author(s): W. Withayachumnankul; B. M. Fischer; S. P. Mickan; D. Abbott
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Paper 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.

Paper Details

Date Published: 20 December 2006
PDF: 17 pages
Proc. SPIE 6415, Micro- and Nanotechnology: Materials, Processes, Packaging, and Systems III, 64150N (20 December 2006); doi: 10.1117/12.695949
Show Author Affiliations
W. Withayachumnankul, The Univ. of Adelaide (Australia)
B. M. Fischer, The Univ. of Adelaide (Australia)
S. P. Mickan, The Univ. of Adelaide (Australia)
D. Abbott, The Univ. of Adelaide (Australia)

Published in SPIE Proceedings Vol. 6415:
Micro- and Nanotechnology: Materials, Processes, Packaging, and Systems III
Jung-Chih Chiao; Andrew S. Dzurak; Chennupati Jagadish; David Victor Thiel, Editor(s)

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