Fig. 14: Plasmon-enhanced detectors.

a Plasmonic mid-infrared polarization detectors⁷. Schematic of the plasmonic photodetector, comprising a graphene transistor adorned with an array of metallic nanoantennas. b Calculated polarization ratio (PR) as a mapping of orientation angle (θ₁, θ₂) values. c Orientation-dependent photoresponse in tapered nanoantennas on graphene. d Calculation of the overall polarization-dependent photoresponse J(θ₁, θ₁, φ). e Photodetector responses for three distinct devices characterized by varying (θ1, θ2) values. f The polarization dependence showing a polarization-angle sensitivity. Reproduced with permission⁷. Copyright 2021 Springer Nature Limited. g Plasmonic silicon-aluminum-nanodisk-based color-sensitive photodetectors²³². Schematic illustration of the color-sensitive detector. h Absorptance spectrum for nanodisk array with a diameter D = 120 nm in Si. i Optical microscope reflection image of the device. j Measured photocurrent as as a function of D under the illumination laser with wavelengths of 488 nm (blue), 532 nm (green), and 633 nm (red). Reproduced with permission²³². Copyright 2022 American Association for the Advancement of Science.