Open AccessApplication of metal-clad antiresonant reflecting hollow waveguides to tunable terahertz notch filter
Author(s) -
Ja-Yu Lu,
Hao-Zai Chen,
Chih-Hsien Lai,
Hung-Chun Chang,
Borwen You,
Tze-An Liu,
Jin-Long Peng
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.000162
Subject(s) - materials science , optics , terahertz radiation , dielectric , passband , band stop filter , cladding (metalworking) , laser linewidth , stopband , optoelectronics , fabry–pérot interferometer , refractive index , bandwidth (computing) , resonator , band pass filter , telecommunications , low pass filter , physics , laser , computer science , metallurgy , wavelength
A novel tunable terahertz notch filter is demonstrated using antiresonant reflecting hollow waveguides with movable metal layers outside dielectric claddings. Based on the Fabry-Pérot resonance of the dielectric cladding, multiple deep notches are observed in a broad THz transmission spectrum. Continuous shift of notch frequencies is for the first time experimentally observed by lateral translation of metal layers from dielectric claddings. The measured maximum frequency-tuning-range approached 60GHz, equaling to 50% of the bandwidth of every passband, and a 20dB rejection notch-depth with a linewidth as narrow as 6GHz at frequency of around 0.2THz was also achieved. Numerical simulations match the measurements and verify the spectral-tuning mechanism.
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