Anti-phase reflection coating maximizing the directionality of grating couplers

We present numerical demonstrations that anti-phase reflection coatings (APRCs) on the core layers of grating couplers (GCs) return anti-phase field into the core layers and cancel the downward scattering from the gratings by destructive interference to improve the upward directionality of the GCs w...

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Bibliographic Details
Published inOptics express Vol. 24; no. 10; pp. 11075 - 11084
Main Authors Tokushima, Masatoshi, Ushida, Jun
Format Journal Article
LanguageEnglish
Published United States 16.05.2016
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Summary:We present numerical demonstrations that anti-phase reflection coatings (APRCs) on the core layers of grating couplers (GCs) return anti-phase field into the core layers and cancel the downward scattering from the gratings by destructive interference to improve the upward directionality of the GCs while the output power per unit length is reduced. Investigating simplified models of GC, we reveal the effect of APRCs semi-analytically and quantitatively. The APRCs can be combined with other enhancement measures, like deep gratings and backside mirrors, to tailor an appropriate output power per unit length while achieving high upward directionalities cooperatively.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.011075