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Patchwork metasurface quantum well photodetectors with broadened photoresponse

2020; Optica Publishing Group; Volume: 29; Issue: 1 Linguagem: Inglês

10.1364/oe.408515

1094-4087

Mel F. 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,

Advanced Antenna and Metasurface Technologies

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.