Photonic crystal enhanced Germanium photodetector on a CMOS compatible SOI platform

Aditya Jain; Richard Pitwon; Sarvagya Dwivedi; Anil Reddy

doi:10.1117/12.3001855

11 March 2024 Photonic crystal enhanced Germanium photodetector on a CMOS compatible SOI platform

Aditya Jain, Richard Pitwon, Sarvagya Dwivedi, Anil Reddy

Proceedings Volume 12892, Optical Interconnects XXIV; 1289206 (2024) https://doi.org/10.1117/12.3001855
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Germanium is the preferred photodetector material at C-band due to its broadband detection range and easy integration with Silicon on Insulator platforms. However, current non-resonant broadband Germanium detectors result in long device lengths, thus resulting in a low RC bandwidth. Smaller resonant detectors provide low parasitic constants at the expense of narrow optical bandwidth. This work presents a waveguide-coupled germanium detector on top of a lattice-shifted photonic crystal waveguide, operating at a broadband slow light mode. Slow light enhances light absorption inside a 14μm long Germanium stripe, resulting in a large responsivity of 0.47A/W at 1V reverse bias and a dark current of 82nA. The device also maintains high responsivity over a bandwidth of 30nm. This work provides a path to design small footprint, broadband, and low dark current Germanium detectors on a CMOS-compatible platform.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Aditya Jain, Richard Pitwon, Sarvagya Dwivedi, and Anil Reddy "Photonic crystal enhanced Germanium photodetector on a CMOS compatible SOI platform", Proc. SPIE 12892, Optical Interconnects XXIV, 1289206 (11 March 2024); https://doi.org/10.1117/12.3001855

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