Advancing Detector Shielding with Thermo-Optic Defocusing in PMMA Integrated on Silicon Nitride

Soon Thor Lim, Thomas Ang, Zifeng Yuan, Thanh Xuan Hoang, Dewen Zhang, Ching Eng Png, Aaron Danner, Gandhi Alagappan

2025

Abstract

This study develops an on-chip optical power limiter (OPL) based on the thermo-optic defocusing effect in PolyMethyl-Methacrylate (PMMA) to protect an avalanche photodiode (APD) from high optical power damage. The OPL is designed to operate within a reduced power range of 0.1 mW to 10 mW by adjusting waveguide dimensions, taper widths, and free-space region (FSR) lengths. Detailed calculations, modelling, and simulations are presented, demonstrating the efficacy of the OPL in limiting optical power reaching the APD, preventing damage and ensuring stable performance in high-power applications.

Paper Citation

in Harvard Style

Lim S., Ang T., Yuan Z., Hoang T., Zhang D., Png C., Danner A. and Alagappan G. (2025). Advancing Detector Shielding with Thermo-Optic Defocusing in PMMA Integrated on Silicon Nitride. In Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS; ISBN 978-989-758-736-8, SciTePress, pages 92-94. DOI: 10.5220/0013148400003902

in Bibtex Style

@conference{photoptics25,
author={Soon Lim and Thomas Ang and Zifeng Yuan and Thanh Hoang and Dewen Zhang and Ching Png and Aaron Danner and Gandhi Alagappan},
title={Advancing Detector Shielding with Thermo-Optic Defocusing in PMMA Integrated on Silicon Nitride},
booktitle={Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS},
year={2025},
pages={92-94},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0013148400003902},
isbn={978-989-758-736-8},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS
TI - Advancing Detector Shielding with Thermo-Optic Defocusing in PMMA Integrated on Silicon Nitride
SN - 978-989-758-736-8
AU - Lim S.
AU - Ang T.
AU - Yuan Z.
AU - Hoang T.
AU - Zhang D.
AU - Png C.
AU - Danner A.
AU - Alagappan G.
PY - 2025
SP - 92
EP - 94
DO - 10.5220/0013148400003902
PB - SciTePress