High-efficiency and high-speed germanium photodetector enabled by multiresonant photonic crystal
Autor: | Cheng Zeng, Jinwen Song, Chengcong Cui, Yuxi Wang, Jinsong Xia, Zhiyong Li, Shuai Yuan, Alan X. Wang |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Materials science
Guided-mode resonance QC1-999 Photodetector chemistry.chemical_element Germanium 02 engineering and technology 01 natural sciences 010309 optics 020210 optoelectronics & photonics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering germanium photodetector Electrical and Electronic Engineering Photonic crystal business.industry Physics high-efficiency guided-mode resonance Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials high-speed chemistry Optoelectronics business photonic crystal Biotechnology |
Zdroj: | Nanophotonics, Vol 10, Iss 3, Pp 1081-1087 (2020) |
ISSN: | 2192-8614 2192-8606 |
Popis: | 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 design high-efficiency, high-speed, normal incidence germanium photodetectors for optical interconnect systems. |
Databáze: | OpenAIRE |
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