Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 39: Poster V
Q 39.14: Poster
Mittwoch, 13. März 2024, 17:00–19:00, Aula Foyer
Sensitivity optimization of diamond infrared-absorption based magnetometry — •Anil Palaci1, Julian M. Bopp1,2, Jonas Wollenberg1, Felipe Perona2, and Tim Schröder1,2 — 1Department of Physics, Humboldt-Universität zu Berlin, 12489 Berlin, Germany — 2Ferdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
Negatively charged nitrogen vacancy (NV) color centers in diamond serve as excellent sensors for magnetic fields, electric fields, and temperature. By utilizing their spin-state dependent photoluminescence or absorption, NV centers enable the precise measurement of various physical and biological signatures under ambient conditions.
In this work, we exploit the NV center’s infrared (IR) 1 E ↔1A 1 transition for absorption-based magnetometry. Using a 1042 nm laser to probe the IR transition allows for magnetic field-dependent absorption. The high saturation intensity of the IR transition enables the use of high-intensity probe light, improving sensitivity limited by shot noise. However, due to the IR transition’s low absorption cross-section, the implementation of a lock-in amplifier becomes necessary. To further enhance sensitivity, we optimize experimental parameters and settings of the lock-in amplifier. With the achieved sensitivity improvement, integration into highly sensitive compact systems becomes feasible without bulky optical setups.
Keywords: diamond; nitrogen-vacancy; NV center; magnetometry; sensing