Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Poster V
Q 39.5: Poster
Mittwoch, 13. März 2024, 17:00–19:00, Aula Foyer
Effects of Pyroelectricity on the Fabrication Yield of Integrated Superconducting Detectors on Lithium Niobate — •Johanna Biendl1, Felix Dreher1, Maximilian Protte1, Jan Philipp Höpker1, Varun B. Verma2, and Tim J. Bartley1 — 1Institute for Photonic Quantum Systems, Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn — 2National Institute of Standards and Technology, CO 80305 Boulder, USA
Reconfigurable photonic quantum systems require a combination of integrated photon sources, modulators and detectors. The best candidates for the realization of on-chip detection are superconducting detectors due to their high efficiency, low dark count rate and good timing accuracy. For the integration of photonic devices, z-cut lithium niobate has proven as an excellent material because of its strong second-order nonlinearity and electro-optic effect. However, the pyroelectric effect causes irreversible damage to integrated superconducting detectors when cooling them down to cryogenic temperatures due to sudden discharges of fields generated by pyroelectric charges. This limits detector fabrication yield to less than 5%. To overcome this limitation we investigate different methods including coating materials, detector dimensions and shorting schemes to compensate the generated charges without constraining the functionality of integrated devices and optical waveguides.
Keywords: SNSPD; Lithium Niobate; Pyroelectricity