Title
Synchronously wired infrared antennas for resonant single-quantum-well photodetection up to room temperature
Author
Hideki T. Miyazaki, Takaaki Mano, Takeshi Kasaya, Hirotaka Osato, Kazuhiro Watanabe, Yoshimasa Sugimoto, Takuya Kawazu, Yukinaga Arai, Akitsu Shigetou, Tetsuyuki Ochiai, Yoji Jimba & Hiroshi Miyazaki
Year
2020
Journal
Nature Communications volume 11, Article number: 565 (2020)
Abstract
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−1, 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.
Full Article
Instrument
FTIR-6200
Keywords
electronics, photonics and device physics, nanocavities, optical physics, metamaterials, FTIR