Thermally controllable filter at terahertz region

•Thermally controlled filter is demonstrated at terahertz range.•The characteristics of filter can be controlled by using dodecanoic acid and polyethylene.•The granular scattering by air voids due to melting of dodecanoic acid is main factor of the characteristics of filter. We experimentally invest...

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Bibliographic Details
Published in:Infrared physics & technology 2018-01, Vol.88, p.139-143
Main Authors: Jun Shin, Hee, Lim, Min-Cheol, Kim, Sae-Hyung, Park, Kisang, Choi, Sung-Wook, Ok, Gyeongsik
Format: Article
Language:English
Subjects:
Dodecanoic acid
Granular scattering
Terahertz filter
Terahertz spectroscopy
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Summary:•Thermally controlled filter is demonstrated at terahertz range.•The characteristics of filter can be controlled by using dodecanoic acid and polyethylene.•The granular scattering by air voids due to melting of dodecanoic acid is main factor of the characteristics of filter. We experimentally investigated terahertz (THz) filters fabricated using dodecanoic acid (DDA) particles and polyethylene (PE) by performing THz time-domain spectroscopy. Since the refractive indices of DDA and PE are the same in the THz range, no optical scattering occurred when they were mixed. However, heating caused air voids to replace the DDA particles, and the DDA melted into the spaces between the PE particles. Furthermore, as the DDA particle size, heating time, and DDA content increased, the THz band width became narrower. Based on the results, we propose a new, low-cost type of THz filter with a simple manufacturing method.
ISSN:1350-4495
1879-0275
DOI:10.1016/j.infrared.2017.11.026