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Polarization-independent 2×2 high diffraction efficiency beam splitter based on two-dimensional grating.

Bin Zhou, Wei Jia, Changcheng Xiang

|October 7, 2021

Summary

This summary is machine-generated.

This study presents a novel 2D silver cylindrical array grating for beam splitting, achieving high polarization-independent diffraction efficiency (DE) over the communication band. This advanced grating offers significant performance improvements for optical applications.

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Last Updated: Oct 17, 2025

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Area of Science:

Optics and Photonics
Nanotechnology
Materials Science

Background:

Current two-dimensional (2D) gratings require enhanced performance, including polarization independence, high efficiency, and wide bandwidth.
Beam splitting applications demand advanced grating designs for improved functionality.

Purpose of the Study:

To propose and demonstrate a 2x2 2D silver cylindrical array grating with superior polarization-independent diffraction efficiency (DE).
To achieve high DE for beam splitting applications within the communication band.

Main Methods:

Rigorous Coupled Wave Analysis (RCWA) for theoretical calculation and design optimization.
Fabrication using holographic exposure technology, wet chemical development, and electron beam evaporation.
Experimental verification of calculated performance through measurement of the fabricated grating.

Main Results:

Achieved over 24% DE for four first diffraction orders at 1550 nm.
Demonstrated excellent polarization independence with only 1.43% nonuniformity for both transverse electric (TE) and transverse magnetic (TM) polarizations.
Experimental results validated the accuracy of the RCWA calculations.

Conclusions:

The proposed 2D silver cylindrical array grating exhibits excellent polarization-independent high diffraction efficiency.
This grating design shows significant potential for applications in optical communication, semiconductor manufacturing, and displacement measurement.