Abstract
A practical guided-mode resonance filter operating in the visible band of the electromagnetic spectrum is numerically designed in this paper. The filter provides high background transmission (>90%) with almost perfect reflection at resonance wavelengths of 623 nm and 641 nm for TE and TM modes, respectively. Our filter is also characterized by its sensitivity to incident angles, polarizations, and a refractive index of the surrounding environment which are utilized in practical applications such as tunable optical filters, imaging or detection. We show that the resonant transmission spectral response can be used for highly sensitive, a potential label-free refractive index biosensor having sensitivities of 90 nm/RIU and 103 nm/RIU, and figure of merits of 1.93 and 2.13 for TM and TE polarizations, respectively.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.
Highlights
Guided-mode resonance (GMR) or waveguidemode resonance is known as a phenomenon in which the resonant waveguide modes are excited in phase-matching elements such as slab waveguide gratings and photonic crystal slabs [1]
A typical GMR grating lter includes a stack of thin dielectric material layers with gratings/photonic crystals inscribed on the waveguiding layer to c 2019 Journal of Advanced Engineering and Computation (JAEC)
GMR eect arises as an evanescent diraction phenomenon occurring at an interface between gratings and free-space when an incident light is coupled into the guided mode of the waveguide component and propagates in it at specic optical parameters of wavelength, angle and polarization modes of the incident light [5, 6]
Summary
Guided-mode resonance (GMR) or waveguidemode resonance is known as a phenomenon in which the resonant waveguide modes are excited in phase-matching elements such as slab waveguide gratings and photonic crystal slabs [1]. GMR gratings and photonic crystal slabs are usually used for optical ltering application thanks to their unique spectral response. GMR lters might have many useful characteristics which include narrow band, high peak eciency, exible structures [2], [711], etc. They have been widely studied for lter applications with practical demands such as narrow band, total reection, and the others [12, 13]. We introduced innovative all-optical switching devices with low switching power and high bistability eciency thanks to the induced GMR in the gratings and photonic crystal slab waveguides [17].
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