[13a-B409-1~10] 3.12 Nanoscale optical science and near-field optics

[13a-B409-6] Metasurface Quantum Well Infrared Photodetectors Based on Synchronously Wired Antennas

〇Hideki T. Miyazaki¹, Takaaki Mano¹, Takeshi Kasaya¹, Hirotaka Osato¹, Kazuhiro Watanabe¹, Yoshimasa Sugimoto¹, Takuya Kawazu¹, Yukinaga Arai¹, Akitsu Shigetou¹, Tetsuyuki Ochiai¹, Yoji Jimba², Hiroshi Miyazaki³, Hainey Jr. Mel Forrest¹ (1.NIMS, 2.Nihon Univ., 3.Tohoku Univ.)

Keywords:photodetector, metasurface, infrared

Applications of metasurfaces for optoelectronic devices require wiring to each isolated antenna for biasing and current flow. Here we show that geometrically engineered metallic wires interconnecting the antennas can function to synchronize the optical phases for promoting coherent resonance, not only as electrical conductors. This synchronously wired antenna concept is applied to intersubbband infrared photodetectors with a single quantum well, and a polarization-independent external quantum efficiency as high as 61% and a detectivity approaching the theoretical limit at 78 K and 6.7 μm is demonstrated. The responsivity even extends to room temperature.