SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 60: Photonics IV

Q 60.7: Vortrag

Freitag, 10. März 2023, 12:30–12:45, A320

Tunable niobium-based plasmonic superconducting photodetectors for the near- and mid-IR — •Sandra Mennle, Philipp Karl, Monika Ubl, Ksenia Weber, Pavel Ruchka, Mario Hentschel, Philipp Flad, and Harald Giessen — 4th Physics Institute, Research Center SCoPE, and IQST, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

In the last few years, photon-based applications such as quantum technologies have become a growing field of research. In particular, highly sensitive photodetectors in the near- and mid-IR spectral range are of high importance. Superconducting nanowire single photon detectors, utilizing the resistivity change during the transition from the superconducting to the normal conducting phase, have great potential due to their high efficiency and sensitivity.

To enhance the absorption at larger wavelengths in the IR spectral range, a plasmonic perfect absorber geometry can be used, which utilizes an impedance-matched plasmonic resonance in combination with a spacer layer and a reflector.

In this work we present detectors which reach an absorption of over 95% for wavelengths up to 4 μm. In contrast to cavities, our approach exhibits angle independence, thus high-NA optics can be used to decrease the spot size, resulting in even smaller detector areas and therefore faster response.

Another advantage of the plasmonic approach is the large bandwidth. Furthermore, with simple changes of the geometry the resonance can be easily tuned over a wide spectral range.