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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

High-efficiency single-order waveguide grating coupler.

I A Avrutsky¹, A S Svakhin, V A Sychugov

¹Institute of General Physics, Academy of Sciences of the USSR, 117942 Moscow, USSR.

|September 23, 2009

Summary

Researchers developed a double-sided corrugated cover film for efficient optical coupling. This method achieves over 90% outcoupling ratio for ion-exchanged waveguides into air.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Efficient coupling between guided and free-space optical modes is crucial for integrated photonic devices.
Existing grating couplers often suffer from low efficiency and limited applications.

Purpose of the Study:

To demonstrate high-efficiency single-order grating coupling between optical waveguide modes and volume waves.
To achieve a high outcoupling ratio into air for ion-exchanged waveguides.

Main Methods:

Utilized a double-sided corrugated cover film with phase-shifted undulations.
Fabricated and tested the grating coupler with weakly guiding ion-exchanged waveguides.

Main Results:

Achieved a single-order grating coupling with high efficiency.
Demonstrated an outcoupling ratio greater than 90% into air.
Established the conditions and tolerances for efficient coupling.

Conclusions:

The double-sided corrugated cover film enables efficient grating coupling.
This technique offers a promising solution for outcoupling light from waveguides.
The established conditions provide a guideline for future device design.