Photonics Research, Volume. 10, Issue 1, 68(2022)
Mid-infrared quasi-BIC resonances with sub-wavelength slot mode profiles in germanium-based coupled guided-mode resonance structures Editors' Pick
Fig. 1. (a) Schematic of the c-GMR structure showing angle of incidence AOI (
Fig. 2. Longitudinal component of electric field (
Fig. 3. (a) Photograph showing sample with fabricated device (highlighted in white box). SEM images showing device (b) cross section before grating fabrication and (c) top view of the grating structures. Scale bar is 2 μm. (d) AFM image showing grating etch depth and sidewall profile.
Fig. 4. (a) Schematic showing GMR excitation under classical mounting condition with TM polarized Gaussian beam incidence. (b) Experimental and (c) simulated (with Gaussian beam excitation) transmission contour map as a function of wavelength and AOI. (d) Resonance peak wavelength shift as a function of AOI comparing experimental (red circles) and simulated data for plane wave (blue curve) and Gaussian beam (red curve) excitations.
Fig. 5. Schematics showing the GMR excitation under (a) classical mounting and (b) full-conical mounting conditions with TM polarized Gaussian beam incidence. Experimental and simulated transmission spectra corresponding to (c), (e) classical and (d), (f) full-conical mounting, respectively. (g) Quality factor (left axis) as a function of AOI from experimental measurements for classical (red circles) and full-conical (blue circles) mounting. Comparison with simulations for plane wave excitation (red solid curve) and Gaussian beam excitation under classical (red dashed curve) and full-conical (blue dashed curve). The asymmetry parameter,
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A. S. Lal Krishna, Sruti Menon, Asish Prosad, Varun Raghunathan. Mid-infrared quasi-BIC resonances with sub-wavelength slot mode profiles in germanium-based coupled guided-mode resonance structures[J]. Photonics Research, 2022, 10(1): 68
Category: Nanophotonics and Photonic Crystals
Received: Sep. 10, 2021
Accepted: Oct. 30, 2021
Published Online: Dec. 13, 2021
The Author Email: Varun Raghunathan (varunr@iisc.ac.in)