Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 6: Solid State Quantum Optics I

Q 6.6: Vortrag

Montag, 11. März 2024, 12:15–12:30, HS 3118

Niobium-based plasmonic superconducting photodetectors for near- and mid-IR up to 12 μm — •Sandra Mennle, Philipp Karl, Monika Ubl, Ksenia Weber, Pavel Ruchka, Philipp Flad, Mario Hentschel, and Harald Giessen — 4th Physics Institute, Research Center SCoPE, and IQST, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Photon-based applications such as quantum technologies have become an important field of research, which requires fast and reliable detectors. Moreover, applications in the mid-IR like spectroscopy are in need for highly efficient photodetection. Superconducting nanowire photon detectors feature a 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 is 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 and demonstrate nanostructures with 90% absorption in the 8-12 μm spectral range. By design, these plasmonic resonances feature a large bandwidth and with simple changes of the geometry the resonance can be easily tuned over a wide spectral range. Another advantage of the plasmonic approach is large angle independence, thus high-NA optics can be used to decrease the spot size, resulting in even smaller detector areas and therefore faster response.

Keywords: plasmonic; photodetectors