Highly-resonant two-polarization transmission guided-mode resonance filter
We theoretically demonstrate a mid-infrared polarization-independent guided-mode-resonance transmission filter. We designed a structure based on a deeply-etched 2D grating above a thin slab of the same material respectively supporting transverse magnetic and transverse electric fundamental modes wit...
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Published in: | AIP advances 2018-11, Vol.8 (11), p.115228-115228-7 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We theoretically demonstrate a mid-infrared polarization-independent guided-mode-resonance transmission filter. We designed a structure based on a deeply-etched 2D grating above a thin slab of the same material respectively supporting transverse magnetic and transverse electric fundamental modes with identical effective index, which propagate along orthogonal directions. This device relates to multi-resonant guided-mode-resonance filters, and more particularly to the concept of zero-contrast gratings (ZCG), which can operate either as wideband reflectors [R. Magnusson, Optics Letters 39, 4337 (2014)] or bandpass filters [M. Niraula, J. W. Yoon, and R. Magnusson, Optics Letters 40, 5062 (2015)]. However, contrary to the latter, this new generation of filters is not bound by stringent material requirements inherent to conventional ZCGs. In particular, ZCGs are demonstrated with high to low refractive index ratio below 2, using germanium as high-index material over a low-index zinc sulfide substrate. These filters exhibit a transmission peak with a full-width at half-maximum of about 30 pm, and a maximum transmission close to 100 % lying in a 46-nm-wide rejection window. |
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ISSN: | 2158-3226 2158-3226 |
DOI: | 10.1063/1.5051621 |