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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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

V Dolores-Calzadilla, D Heiss, M Smit

|May 3, 2014

Summary

This summary is machine-generated.

We designed a metal grating coupler for membrane photonic circuits, achieving up to 89% fiber-to-chip coupling efficiency. This versatile coupler works with various layer stacks for applications like silicon photonics integration and thermal isolation.

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Area of Science:

Photonics
Optical Engineering
Materials Science

Background:

Membrane photonic circuits require efficient fiber-to-chip coupling.
Current coupling methods face limitations with diverse underlying layer stacks.

Purpose of the Study:

To design a metal grating coupler compatible with membrane photonic circuits.
To achieve high fiber-to-chip coupling efficiency and broad bandwidth.
To ensure compatibility with various underlying layer stacks for diverse applications.

Main Methods:

Design of a buried metal grating and metal mirror coupler.
Analysis of nonapodized and apodized designs.
Theoretical efficiency and bandwidth calculations at 1.55 μm.

Main Results:

Nonapodized design achieved up to 73% coupling efficiency.
Apodized designs reached theoretical efficiencies as high as 89%.
3 dB bandwidths of 61 nm (nonapodized) and 78 nm (apodized) were observed.
Coupling efficiency is independent of the underlying layer stack.

Conclusions:

The metal grating coupler offers high efficiency and bandwidth for membrane photonic circuits.
Its layer-stack independence enables flexible integration for applications like III-V/silicon photonics and thermal isolation.
This design enhances the versatility and applicability of membrane photonic platforms.