Fano resonances of dielectric gratings: symmetries and broadband filtering

Fano resonances of dielectric gratings: symmetries and broadband filtering

The guided mode resonances (GMRs) of diffraction gratings surrounded by low index materials can be designed to produce broadband regions of near perfect reflection and near perfect transmission. These have many applications, including in optical isolators, in hybrid lasers cavities and in photovolta...

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Bibliographic Details
Published in:Optics express Vol. 23; no. 24; pp. A1672 - A1686
Main Authors: Sturmberg, Björn C P, Dossou, Kokou B, Botten, Lindsay C, McPhedran, Ross C, de Sterke, C Martijn
Format: Journal Article
Language:English
Published: United States 30-11-2015
Online Access:Get full text
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Summary:The guided mode resonances (GMRs) of diffraction gratings surrounded by low index materials can be designed to produce broadband regions of near perfect reflection and near perfect transmission. These have many applications, including in optical isolators, in hybrid lasers cavities and in photovoltaics. The excitation of rapid GMRs occurs in a background of slowly varying Fabry-Perot oscillation, which produces Fano resonances. We demonstrate the critical role of the polarity of adjacent Fano resonances in the formation of the broadband features. We design gratings for photovoltaic applications that operate at wavelengths where material absorption must be considered and where light is incident at non-normal angles.
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content type line 23
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.0A1672