Please use this identifier to cite or link to this item: https://doi.org/10.1002/adom.202000337
Title: High-Responsivity Mid-Infrared Black Phosphorus Slow Light Waveguide Photodetector
Authors: Ma, Yiming 
Dong, Bowei 
Wei, Jingxuan 
Chang, Yuhua 
Huang, Li
Ang, Kah-Wee 
Lee, Chengkuo 
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Optics
Materials Science
black phosphorus
mid-infrared
photodetectors
slow light
waveguides
GRAPHENE PHOTODETECTOR
SILICON PHOTONICS
INTEGRATION
CHIP
Issue Date: 2020
Publisher: WILEY-V C H VERLAG GMBH
Citation: Ma, Yiming, Dong, Bowei, Wei, Jingxuan, Chang, Yuhua, Huang, Li, Ang, Kah-Wee, Lee, Chengkuo (2020). High-Responsivity Mid-Infrared Black Phosphorus Slow Light Waveguide Photodetector. ADVANCED OPTICAL MATERIALS 8 (13). ScholarBank@NUS Repository. https://doi.org/10.1002/adom.202000337
Abstract: Black phosphorus (BP) offers unique opportunities for mid-infrared (MIR) waveguide photodetectors due to its narrow direct bandgap and layered lattice structure. Further miniaturization of the photodetector will improve operation speed, signal-to-noise ratio, and internal quantum efficiency. However, it is challenging to maintain high responsivities in miniaturized BP waveguide photodetectors because of reduced light–matter interaction lengths. To address this issue, a method utilizing the slow light effect in photonic crystal waveguides (PhCWGs) is proposed and experimentally demonstrated. A shared-BP photonic system is proposed and utilized to fairly and precisely characterize the slow light enhancement. Close to the band edge around 3.8 µm, the responsivity is enhanced by more than tenfold in the BP photodetector on a 10 µm long PhCWG as compared with the counterpart on a subwavelength grating waveguide. At a 0.5 V bias, the BP PhCWG photodetector achieves a 11.31 A W responsivity and a 0.012 nW Hz noise equivalent power. The trap-induced photoconductive gain is validated as both the dominant photoresponse mechanism and the major limiting factor of the response speed. The BP slow light waveguide photodetector is envisioned to realize miniaturized high-performance on-chip MIR systems for widespread applications including environmental monitoring, industrial process control, and medical diagnostics. −1 −1/2
Source Title: ADVANCED OPTICAL MATERIALS
URI: https://scholarbank.nus.edu.sg/handle/10635/188707
ISSN: 21951071
21951071
DOI: 10.1002/adom.202000337
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