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Miyazaki, Hideki T; Mano, Takaaki; Kasaya, Takeshi; Osato, Hirotaka; Watanabe, Kazuhiro; Sugimoto, Yoshimasa; Kawazu, Takuya; Arai, Yukinaga; Shigetou, Akitsu; Ochiai, Tetsuyuki; Jimba, Yoji; Miyazaki, Hiroshi
Nature communications, 01/2020, Letnik: 11, Številka: 1Journal Article
Optical patch antennas sandwiching dielectrics between metal layers have been used as deep subwavelength building blocks of metasurfaces for perfect absorbers and thermal emitters. However, for applications of these metasurfaces for optoelectronic devices, wiring to each electrically isolated antenna is indispensable 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. Antennas connected with optimally folded wires are applied to intersubband infrared photodetectors with a single 4-nm-thick quantum well, and a polarization-independent external quantum efficiency as high as 61% (responsivity 3.3 A W , peak wavelength 6.7 μm) at 78 K, even extending to room temperature, is demonstrated. Applications of synchronously wired antennas are not limited to photodetectors, but are expected to serve as a fundamental architecture of arrayed subwavelength resonators for optoelectronic devices such as emitters and modulators.
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