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Fully transparent GaN/InGaN LED as a position sensitive detector.

Christine K McGinn, Keith Behrman, Emily Bittle

|September 23, 2025

Summary

This summary is machine-generated.

Researchers developed a transparent position-sensitive detector (PSD) using gallium nitride LEDs. This device accurately locates laser beams in two dimensions, crucial for optical technologies and laser alignment.

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Area of Science:

Optoelectronics
Semiconductor Devices
Photonics

Background:

Commercial optical technologies require precise in-situ beam localization for laser alignment.
Existing methods may lack accuracy, transparency, or in-situ capabilities for certain applications.

Purpose of the Study:

To develop a fully transparent two-dimensional position-sensitive detector (PSD).
To leverage gallium nitride (GaN) light-emitting diodes (LEDs) with indium gallium nitride (InGaN) quantum wells for PSD fabrication.
To characterize the performance of fabricated PSD devices for laser beam detection.

Main Methods:

Fabrication of two distinct architectures for the transparent PSD using GaN LEDs.
Characterization of the fabricated devices to assess their position-sensing capabilities.
Testing with 405 nm laser light to evaluate detection accuracy and linearity.

Main Results:

Successfully and repeatably located 405 nm laser light in two dimensions within the PSD area.
Achieved a limit of detection as low as 8.4 micrometers (μm).
Demonstrated approximately 3% linearity in position detection.

Conclusions:

Gallium nitride LEDs with InGaN quantum wells are effective for creating transparent PSDs.
The developed PSD offers accurate, in-situ laser beam localization for optical applications.
The device shows promise for enhancing laser alignment in various commercial technologies.