5 January 2017 Guided-mode resonance filter with variable bandwidth using coupling gratings near the Brewster angle
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Proceedings Volume 10244, International Conference on Optoelectronics and Microelectronics Technology and Application; 1024428 (2017) https://doi.org/10.1117/12.2264680
Event: International Conference on Optoelectronics and Microelectronics Technology and Application, 2016, Shanghai, China
Abstract
Guided-mode resonance filter (GMRF) with variable bandwidth using coupling gratings near the Brewster angle is presented. For the contact coupling gratings, the bandwidth of the GMRF can be significantly altered with the resonance location kept almost the same as the transverse shift is varied. The resonance location blue-shifts with the increase of the air gap thickness in both cases of S=0 and S=0.5. The filter bandwidth is increased exponentially with the increase of the air gap thickness at the aligned condition due to the decreased mode confinement. In the case of the maximum misaligned condition, the filter bandwidth is reduced exponentially with the increase of the air gap thickness due to the decreased mode coupling between the two misaligned gratings. The spectral response of the coupling gratings coincides with each other for both the aligned condition and the maximum misaligned condition when the thickness of the air gap is large enough. The resonance location almost does not move as it approaches the cutoff wavelength of the substrate. The sideband level is kept low as the transverse and horizontal shifts are varied due to the Brewster antireflection (AR) effect.
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Tian Sang, Junlang Li, Jianyu Zhou, Rui Wang, Yueke Wang, Jicheng Wang, "Guided-mode resonance filter with variable bandwidth using coupling gratings near the Brewster angle", Proc. SPIE 10244, International Conference on Optoelectronics and Microelectronics Technology and Application, 1024428 (5 January 2017); doi: 10.1117/12.2264680; https://doi.org/10.1117/12.2264680
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