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QI: Fachverband Quanteninformation
QI 1: Implementations: Atoms, Ions and Photons
QI 1.3: Vortrag
Montag, 20. September 2021, 11:45–12:00, H4
Superconducting Nb-based plasmonic perfect absorbers for tunable near- and mid-IR photodetection — •Philipp Karl1, Sandra Mennle1, Monika Ubl1, Ksenia Weber1, Mario Hentschel1, Philipp Flad1, Jing-Wei Yang2,3, Yu-Jung Lu2,3, and Harald Giessen1 — 14th Physics Institute, Research Center SCoPE, and IQST, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan — 3Department of Physics, National Taiwan University, Taipei 10617, Taiwan
Quantum technologies require the provision of high-quality and efficient photodetectors, as well as the ability to detect single photons, which can be provided by superconducting nanowire single photon detectors. To reach near-100% absorption with our structures we are utilizing resonant plasmonic perfect absorber effects. This is aided by the angle insensitivity and the high resonant absorption cross section and of plasmonic resonances, which enable ultra-small active areas and short recovery times. In this work, we present simulations as well as measurements of tunable superconducting niobium based plasmonic perfect absorber structures with near-100% absorption efficiency in the infrared spectral range and use the tunable plasmonic resonance to create a polarization dependent photodetector. To demonstrate the resonant plasmonic behavior, which manifests itself through a polarization dependence detector response, we investigated the detector structure with an external light source, as well as with a directly coupled single mode fiber.