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14 May 2019 Terahertz transmittance properties of all-dielectric guided-mode resonance filter (Conference Presentation)
Tae-In Jeon
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Proceedings Volume 10983, Next-Generation Spectroscopic Technologies XII; 109830W (2019) https://doi.org/10.1117/12.2519687
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States
Abstract
In this research, an all-dielectric guided-mode resonance (GMR) filter operating in the THz region is proposed. The GMR filter is a combination of a grating on the filter surface and slab waveguides of the filter substrate. Two strong transverse electric (TE) resonance and transverse magnetic (TM) resonance modes were detected. The limited resonance depth resulting from the finite grating periods can be overcome by using two identical GMR filters. We were able to obtain a Q-factor of up to 74.4 for the TM0,1 mode. When the grating structure of the GMR filter was 45° (rotation angle) to polarize the THz beam, the resonance amplitudes of the TE and TM resonances became 50% and 50%, respectively. Also, we obtained polarization efficiencies of up to 96.9% for the TE0,1 mode when the filter was rotated to 90°. Furthermore, if the GMR filter is inserted between Teflon plates, the TE1.1 mode can be perfectly removed. Meanwhile, a variable grating period made of quartz has been applied to fabricate a tunable guided mode resonance (TGMR) filter. With a metal slit spacing of 2 mm located in front of the TGMR filter, the resonance frequency could be shifted up to 87, 96, and 82 GHz, where the center frequencies of each resonance were 0.402, 0.579, and 0.460 THz, for the TE0,1, TE1.1, and TM0,1, respectively. Furthermore, because the TGMR and GMR filters are placed independently in the THz beam path, both tunable and fixed resonances can be obtained at the same time in the spectrum.
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Tae-In Jeon "Terahertz transmittance properties of all-dielectric guided-mode resonance filter (Conference Presentation)", Proc. SPIE 10983, Next-Generation Spectroscopic Technologies XII, 109830W (14 May 2019); https://doi.org/10.1117/12.2519687
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KEYWORDS
Optical filtering
Optical filters
Terahertz radiation
Transmittance
Tunable filters
Magnetism
Metals
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