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Q: Fachverband Quantenoptik und Photonik

Q 60: Photonics IV

Q 60.3: Talk

Friday, March 10, 2023, 11:30–11:45, A320

3D lithography for single-photon level spectroscopy with superconducting detectors — •Johanna Biendl, Maximilian Protte, Timon Schapeler, Thomas Hummel, and Tim J. Bartley — Institute for Photonic Quantum Systems, Paderborn University, Germany

Wavelength is a characteristic property of light, the study of which is a crucial technique in many areas of physics. However, measuring wavelength at the single-photon level is a challenging task. Superconducting detectors have shown excellent single photon counting capabilities, however they are typically broadband devices. We aim to combine the advantages of superconducting single-photon detectors with spectrally selective elements at the microscale under cryogenic operating conditions. Using 3D lithography, we fabricated an array of Fabry-Pérot etalons that encodes the spectral information of incident light by generating a unique transmission pattern. By measuring these transmission spectra with superconducting nanowire single-photon detectors, we demonstrated functionality at the single-photon level. The combination of the etalon array with superconducting detectors will therefore enable a reconstructive single-photon spectrometer that can be operated in the near-infrared wavelength range.