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High-efficiency and High-speed Germanium Photodetector Enabled by Multiresonant Photonic Crystal by Jinwen Song; Shuai Yuan; Chengcong Cui; Yuxi Wang; Zhiyong Li; Alan X. Wang; Cheng Zeng; Jinsong Xia is a Engineering article available to read on EtoBox.

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High-efficiency and high-speed photodetectors with broadband responses are playing pivotal roles for wavelength-division multiplexing optical communications. Germanium photodetectors on silicon platforms exhibit potential cost advantage due to the compatibility for monolithic integration with silicon-based electronic circuits for signal amplification and processing. In this article, we report a normal incidence, germanium photodetector enabled by guided-mode resonances in photonic crystal, which successfully resolved the compromise between quantum efficiency, wavelength coverage and bandwidth requirement, a drawback usually faced by conventional photodetectors operating at normal incidence. The resonant photonic crystal structure is designed to support multiple resonances in the target wavelength range. With an intrinsic absorption layer thickness of 350 nm, the device achieved a high external quantum efficiency of 50% at 1550 nm, along with an enhancement around 300% for the entire C-band. Using a mesa diameter of 14 μm, the fabricated device exhibited a 3-dB bandwidth of 33 GHz and obtained clear eye diagrams at bit rate up to 56 Gbps. This work provides a promising method to des

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Author

Jinwen Song; Shuai Yuan; Chengcong Cui; Yuxi Wang; Zhiyong Li; Alan X. Wang; Cheng Zeng; Jinsong Xia

Publisher

Walter de Gruyter GmbH

Published

2020

Language

EN

Field

Engineering (Physical Sciences)