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Vertical directional coupling based grating emission engineering for optical phased arrays.

Jiazhu Duan, Weiming Yao, Xiangjie Zhao

|June 2, 2024

Summary

This summary is machine-generated.

A new vertical directional coupling waveguide grating (VDCWG) enables longer on-chip optical phased array antennas. This innovation enhances grating strength, paving the way for larger aperture optical phased arrays.

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Area of Science:

Photonics
Integrated Optics
Antenna Engineering

Background:

On-chip optical phased arrays (OPAs) require long waveguide grating antennas for large apertures.
Existing architectures face limitations in antenna length and grating strength control.

Purpose of the Study:

To propose and demonstrate a novel vertical directional coupling waveguide grating (VDCWG) architecture.
To enhance antenna length and provide precise control over grating emission strength for large-aperture OPAs.

Main Methods:

Theoretical analysis and numerical simulations of the VDCWG.
Experimental demonstration of a VDCWG antenna and a 16-channel OPA.

Main Results:

The VDCWG architecture allows grating strength adjustment over two orders of magnitude.
An effective grating length exceeding one centimeter is achievable.
A 1.5 mm VDCWG antenna exhibited a grating strength of 0.17 mm⁻¹ and a divergence angle of 0.061°.

Conclusions:

The VDCWG offers significant design freedom for engineering grating emission strength.
The VDCWG architecture shows strong potential for realizing large-aperture on-chip optical phased arrays.