Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 6: Solid State Quantum Optics I

Q 6.7: Talk

Monday, March 11, 2024, 12:30–12:45, HS 3118

Towards ultra-small superconducting Nb-based plasmonic fiber coupled photodetectors arrays — •Philipp Karl, Sandra Mennle, 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

Quantum technologies require high-quality and efficient photodetectors and the ability to detect single photons, which can be provided by superconducting nanowire single photon detectors.

We present a superconducting niobium-based plasmonic perfect absorber detector and with near-100% absorption efficiency in the near-infrared spectral range.

To reach the near-100% absorption over a wide spectral range, we take advantage of resonant plasmonic perfect absorber effects and their high resonant absorption cross-section, to enable ultra-small active areas and short recovery times.

To ensure the perfect coupling, we utilize directly coupled single mode fibers in combination with high NA micro optics, which are printed onto the fibers.

With this knowledge, we demonstrate a scalable pixel detector design, which inherits all the previous excellent detector properties.

Keywords: Plasmons; Plasmonic perfect absorber; Superconducting nanowire single photon detectors; Fiber coupling