A group of researchers based at Solid State Physics recently reported on the first nanowire photodetector sensitive to long-wavelength infrared radiation. The infrared response from 3 to 20 μm is enabled by intersubband transitions in InAsP quantum discs synthesized axially within InP nanowires. The intriguing optical characteristics, including unexpected sensitivity to normal incident radiation, are explained by excitation of optical modes in the photonic crystal formed by the nanostructured portion of the detectors.The main advantages of the demonstrated detector include engineered broadband infrared sensitivity at normal incidence in a detector design compatible with silicon platforms.
Read the paper published in Nano Letters: “Intersubband Quantum Disc-in-Nanowire Photodetectors with Normal-Incidence Response in the Long-Wavelength Infrared” by M. Karimi, M. Heurlin, S. Limpert, V. Jain, X. Zeng, I. Geijselaers, A. Nowzari, Y. Fu, L. Samuelson, H. Linke, M. T. Borgström, and H. Pettersson. Nano Lett., 2018, 18 (1), pp 365–372 DOI: 10.1021/acs.nanolett.7b04217