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Updated: Jul 6, 2026

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

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Efficiency-enhanced third-order grating coupler.

S Ura¹, T Fujii, T Suhara

¹Department of Electronic Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-Oka, Suita, Osaka 5650871, Japan. ura@ele.eng.osaka-u.ac.jp

|March 6, 2008

Summary

This summary is machine-generated.

This study enhances grating coupler efficiency by using a third-order design with a reflection film. Optimized buffer layer thickness suppresses unwanted diffraction, directing power to the desired output wave.

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Area of Science:

Photonics
Optical Engineering
Nanotechnology

Background:

Grating couplers are essential for integrated optics, but efficiency is often limited.
First-order gratings suffer from significant power loss into unwanted diffraction orders.

Purpose of the Study:

To enhance the efficiency of grating couplers.
To investigate a third-order grating coupler design with integrated reflection film.
To optimize optical buffer layer thickness for improved power distribution.

Main Methods:

Designed a third-order grating coupler with a grating period three times that of a first-order grating.
Integrated a reflection film between the optical buffer layer and the substrate.
Analyzed interference effects to determine optimal optical buffer layer thickness.
Fabricated and experimentally evaluated a demonstrator at a wavelength of 0.82 micrometers.

Main Results:

Achieved a measured output coupling efficiency of 40% for the third-order grating coupler.
Theoretical predictions indicated a potential efficiency of 60%.
Demonstrated suppression of first- and second-order diffraction waves.

Conclusions:

The third-order grating coupler design with an integrated reflection film shows promise for efficiency enhancement.
Optical buffer layer thickness is a critical parameter for controlling power distribution and suppressing unwanted diffraction.
Further optimization is needed to bridge the gap between theoretical predictions and measured efficiencies.