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Q: Fachverband Quantenoptik und Photonik
Q 70: Nanophotonics I
Q 70.8: Vortrag
Freitag, 14. März 2025, 12:45–13:00, HS I PI
Luminescence thermometry based on photon emitters in nanophotonic silicon waveguides — Kilian Sandholzer1,2, Stephan Rinner1,2, Justus Edelmann1,2, •Nilesh Goel1,2, and Andreas Reiserer1,2 — 1Technical University of Munich, TUM School of Natural Sciences, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), 85748 Garching, Germany
The reliable measurement and accurate control of the temperature within nanophotonic devices is a crucial prerequisite for their application in classical and quantum technologies. Established approaches use sensors attached to the components, which offer a limited spatial resolution and thus impede the measurement of local heating effects. We study an alternative temperature sensing technique based on measuring the luminescence of erbium emitters directly integrated into nanophotonic silicon waveguides. To cover the entire temperature range from 295 K to 2 K, we investigate two approaches: The thermal activation of non-radiative decay channels for temperatures above 200 K and the thermal depopulation of spin- and crystal-field levels at lower temperatures. The achieved sensitivity is 0.22(4) %/K at room temperature and increases up to 420(50) %/K at approximately 2 K. Combining this with spatially selective implantation promises precise thermometry from ambient to cryogenic temperatures with a spatial resolution down to a few nanometers.
Keywords: Thermometry; Erbium emitters; Silicon waveguides; Nanophotonics; Precision measurement