On-chip GaAs carrier lifetime investigation

Chawaphon Prayoonyong; Crispin Szydzik; Guanghui Ren; Bill Corcoran; Aditya Dubey; Caitlin E. Murray; Toby Mitchell; Arnan Mitchell

arXiv · 2503.12487

On-chip GaAs carrier lifetime investigation

Chawaphon Prayoonyong·Crispin Szydzik·Guanghui Ren·Bill Corcoran·Aditya Dubey·Caitlin E. Murray·Toby Mitchell·Arnan Mitchell

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Abstract

We propose an alternative way to determine GaAs carrier lifetime using pump-probe measurement based on fibre optics and integrated waveguides. We find that our GaAs samples have the lifetime ranging from 30-80 ps, supporting the bandwidth $\geq$ 12.5 GHz. The platform utilised in this work could offer a cost-effective way to investigate photocarrier lifetime. Moreover, it may have the potential for high-speed switches and detectors, or could be exploited for possible all-optical modulation.

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Chawaphon Prayoonyong, Crispin Szydzik, Guanghui Ren, Bill Corcoran, Aditya Dubey, Caitlin E. Murray, Toby Mitchell, Arnan Mitchell. 2025-03-16. On-chip GaAs carrier lifetime investigation. https://arxiv.org/abs/2503.12487

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