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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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All-dielectric unidirectional dual-grating output coupler.

Andrew B Greenwell, Sakoolkan Boonruang, M G Moharam

|June 18, 2009

Summary

A new all-dielectric double-grating coupler offers efficient, unidirectional light output. This robust design is tolerant to fabrication errors, achieving high coupling efficiency without complex phase-matching or resonances.

Area of Science:

Photonics and optical engineering
Dielectric nanostructures
Diffractive optics

Background:

Dielectric nanostructures are crucial for advanced optical devices.
Efficient light coupling is essential for integrated photonic circuits.
Unidirectional couplers minimize signal loss and crosstalk.

Purpose of the Study:

To propose and analyze a novel all-dielectric unidirectional output double-grating coupler.
To demonstrate a robust and efficient light coupling mechanism.
To investigate the performance of the proposed coupler under varying grating properties.

Main Methods:

Rigorous theoretical analysis of a double-grating structure.
Numerical simulations to evaluate diffraction orders and coupling efficiency.

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Parametric study of grating periodicities and dimensions.

Main Results:

A double-grating coupler design with no propagating diffracted orders in the superstrate.
Single diffracted order achieved in the substrate region for unidirectional output.
High coupling efficiency up to 96% from the substrate-side grating.
Robust performance demonstrated, tolerant to fabrication errors and requiring no phase-matching or resonances.

Conclusions:

The proposed all-dielectric double-grating coupler is a highly efficient and robust solution for unidirectional light output.
This design offers significant advantages for integrated photonics due to its fabrication tolerance and simplicity.
The concept paves the way for advanced photonic devices with improved performance and reliability.