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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Sub-wavelength grating assisted mode order converter on the SOI substrate.

Zhuo Cheng, Jun Wang, Zeyuan Yang

|December 28, 2019

Summary

Three novel mode order converters were designed for silicon photonics. These devices achieve high-efficiency conversion between transverse electric modes (TE₀-to-TE₁, TE₀-to-TE₂, TE₀-to-TE₃) with compact footprints and simplified fabrication.

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Area of Science:

Photonics
Integrated Optics
Nanophotonics

Background:

Mode order converters are crucial components in silicon photonics for manipulating light.
Existing designs often face challenges with device size, efficiency, or fabrication complexity.

Purpose of the Study:

To design and simulate three novel mode order converters on a silicon-on-insulator (SOI) substrate.
To achieve efficient conversion between different transverse electric (TE) modes (TE₀-to-TE₁, TE₀-to-TE₂, TE₀-to-TE₃).

Main Methods:

Utilized sub-wavelength gratings integrated onto an SOI platform.
Performed detailed optical simulations to evaluate device performance and characteristics.

Main Results:

Achieved high conversion efficiencies: >94.4% for TE₀-to-TE₁, >95.7% for TE₀-to-TE₂, and >83.7% for TE₀-to-TE₃.
Demonstrated compact device lengths: 8.72 µm, 4.98 µm, and 14.54 µm, respectively.
Operated effectively across a wavelength range of 1.5 µm to 1.6 µm.

Conclusions:

The proposed sub-wavelength grating mode order converters offer excellent performance in terms of efficiency and size.
A single-etch fabrication process simplifies manufacturing, making these devices advantageous for integrated photonic circuits.