Highly-efficient absorber based on a patterned ultrathin Ge-on-insulator slab for photodetection

Yijin Zhang; Xiyuan Cao; Hanyue Li; Yi Jin; Aimin Wu

doi:10.1117/12.2646128

23 January 2023 Highly-efficient absorber based on a patterned ultrathin Ge-on-insulator slab for photodetection

Yijin Zhang, Xiyuan Cao, Hanyue Li, Yi Jin, Aimin Wu

Proceedings Volume 12556, AOPC 2022: Optoelectronics and Nanophotonics; 125560L (2023) https://doi.org/10.1117/12.2646128
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

High efficient photodetectors are of paramount importance in optical communications as the advent of the big data era. The bandwidth-efficiency trade-off of detectors has always been being a limiting problem. We demonstrate here that ultrahigh absorption more than 85% can be achieved at wavelength 1300 nm by only patterning an ultrathin germanium (Ge) slab with a periodic array of air holes, which is about 3 times comparing with that of a uniform Ge slab of the same thickness. The enhanced absorption is mainly attributed to the critical coupling of the guided resonance of the photonic crystal slab. This work paves a way for high-responsivity surface-illuminated photodetection with a patterned ultrathin Ge slab.

Citation Download Citation

Yijin Zhang, Xiyuan Cao, Hanyue Li, Yi Jin, and Aimin Wu "Highly-efficient absorber based on a patterned ultrathin Ge-on-insulator slab for photodetection", Proc. SPIE 12556, AOPC 2022: Optoelectronics and Nanophotonics, 125560L (23 January 2023); https://doi.org/10.1117/12.2646128

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