Normal incidence narrowband transmission filtering capabilities using symmetry-protected modes of a subwavelength, dielectric grating

We computationally study a normal incidence narrowband transmission filter based on a subwavelength dielectric grating that operates through Fano interference between supported guided leaky modes of the system. We characterize the filtering capabilities as the cross section of the grating is manipul...

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Bibliographic Details
Published in:Optics letters 2015-06, Vol.40 (11), p.2637-2640
Main Authors: Foley, Justin M, Phillips, Jamie D
Format: Article
Language:English
Subjects:
Cross sections
Dielectrics
Diffraction gratings
Filtering
Filtration
Gratings (spectra)
Incidence
Narrowband
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Summary:We computationally study a normal incidence narrowband transmission filter based on a subwavelength dielectric grating that operates through Fano interference between supported guided leaky modes of the system. We characterize the filtering capabilities as the cross section of the grating is manipulated and suggest techniques for experimental demonstration. Using group theory, we study the plane wave coupling to the supported modes that leads to broadband reflectance and narrowband transmittance responses for rectangular, pentagonal, rhomboidal, and right trapezoidal cross-sectional geometries.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.40.002637