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Title: Enhanced photodetection in graphene-integrated photonic crystal cavity

We demonstrate the controlled enhancement of photoresponsivity in a graphene photodetector by coupling to slow light modes in a long photonic crystal linear defect cavity. Near the Brillouin zone (BZ) boundary, spectral coupling of multiple cavity modes results in broad-band photocurrent enhancement from 1530 nm to 1540 nm. Away from the BZ boundary, individual cavity resonances enhance the photocurrent eight-fold in narrow resonant peaks. Optimization of the photocurrent via critical coupling of the incident field with the graphene-cavity system is discussed. The enhanced photocurrent demonstrates the feasibility of a wavelength-scale graphene photodetector for efficient photodetection with high spectral selectivity and broadband response.
Authors:
;  [1] ; ; ;  [2] ; ;  [3] ; ;  [4]
  1. Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  2. Department of Electrical Engineering, Columbia University, New York, New York 10027 (United States)
  3. Department of Mechanical Engineering, Columbia University, New York, New York 10027 (United States)
  4. Air Force Research Laboratory, Sensors Directorate, WPAFB, Dayton, Ohio 45433 (United States)
Publication Date:
OSTI Identifier:
22253809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BRILLOUIN ZONES; CRYSTALS; DEFECTS; GRAPHENE; OPTIMIZATION; PEAKS; RESONANCE; WAVELENGTHS