Opt Lett. 2014 May 01;39(9):2786-9. doi: 10.1364/OL.39.002786.

Highly efficient metal grating coupler for membrane-based integrated photonics.

Optics letters

V Dolores-Calzadilla, D Heiss, M Smit

PMID: 24784103 DOI: 10.1364/OL.39.002786

Abstract

We present the design of a metal grating coupler compatible with membrane photonic circuit platforms, consisting of a buried metal grating and a metal mirror. A nonapodized design provides a fiber-to-chip coupling efficiency at 1.55 μm up to 73%, whereas apodized designs show theoretical efficiencies as high as 89%, with a 3 dB bandwidth of 61 and 78 nm, respectively. An important advantage is that the coupling efficiency is independent from the underlying layer stack, enabling its use in diverse applications. For example, a thin buffer layer is required to achieve optical coupling for the heterogeneous integration of III-V and silicon photonics, whereas a thick buffer is of interest for thermal isolation between photonic membranes and CMOS circuits.

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• Journal Article