Open AccessPatchwork metasurface quantum well photodetectors with broadened photoresponse
Author(s) -
Mel Hainey,
Takaaki Mano,
Takeshi Kasaya,
Yoji Jimba,
Hiroshi Miyazaki,
Tetsuyuki Ochiai,
Hirotaka Osato,
Kazuhiro Watanabe,
Yoshimasa Sugimoto,
Takuya Kawazu,
Yukinaga Arai,
Akitsu Shigetou,
Hideki T. Miyazaki
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.408515
Subject(s) - photodetector , responsivity , optoelectronics , optics , quantum well infrared photodetector , broadband , wideband , wavefront , detector , dielectric , quantum , quantum efficiency , bandwidth (computing) , physics , materials science , quantum well , computer science , laser , telecommunications , quantum mechanics
Complex lightwave manipulation such as broadband absorption has been realized with metasurfaces based on laterally arranged metal-dielectric-metal cavities with different geometries. However, application of these metasurfaces for optoelectronic devices by incorporating functional dielectrics remains challenging. Here, we integrate a quantum well infrared photodetector (QWIP) with a metasurface made of a patchwork of square cavities with different dimensions arranged in a subwavelength unit cell. Our detector realizes wideband photoresponse approaching the entire responsivity spectrum of the QWIP-single-sized square cavities can utilize only 60% of the possible bandwidth-and external quantum efficiencies of up to 78% at 6.8 µm. Our highly flexible design scheme enables integration of photodetectors and metasurfaces with arbitrary arrangements of cavities selectively responding to incidence with a specific wavefront.