Mid-wave/long-wave dual-color infrared quantum cascade detector enhanced by antenna-coupled microcavity

Abstract

We have demonstrated a mid-wave/long-wave dual-color infrared quantum cascade detector enhanced by antenna-coupled microcavity. By optimizing the size of patches, the coupling wavelength of the antenna-coupled microcavity can be conveniently tuned to match the targeted intersubband transition energy. At 77 K, the peak responsivity of our detector is 4.1mA/W for long wave (10.4 mu m) and 0.6mA/W for mid wave (5.8 mu m), while the detectivity is 1.8x10(9) cm.Hz(1/2)/W (Jones) and 2.6x10(8) cm.Hz(1/2)/W (Jones), respectively. Compared with a reference device with a 45 degrees multi-pass geometry, the responsivity of our detector has been increased by a factor of 9.1 for the long wave and 2.7 for the mid wave. Our results illustrate how to realize a dual-color infrared detector and improve the optoelectronic performance through the concept of antenna-coupled microcavity. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.