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QI: Fachverband Quanteninformation
QI 23: Poster II (joint session QI/Q)
QI 23.20: Poster
Mittwoch, 8. März 2023, 16:30–19:00, Empore Lichthof
Miniaturized fiber-based endoscope with direct laser written antenna structures — •Stefan Dix1, Jonas Gutsche1, Erik Waller1,2, Georg von Freymann1,2, and Artur Widera1 — 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, 67663 Kaiserslautern, Germany
Fiber-based endoscopic sensors are established and widely applied as local fluorescence detectors for various samples, replacing bulky microscopes. Such sensors require the integration of sensing objects, such as nitrogen-vacancy (NV) centers in diamond and microwave antennas on small scales. Here, the microwave (MW) field addresses a transition in the NV center for magnetic field sensing. The MW fields needed are usually created using thin conducting wires or chip-based antennas close to the diamond sample. These approaches either lead to fragile, bulky, or inefficient sensor tips.
Here, we present a robust fiber-based endoscope with a direct laser written silver antenna structure close to a 50 µm multimode fiber core for optimal efficiency. Using such an endoscope, we measure an ODMR sensitivity of 17.8 nT /√Hz by probing 15 µm large diamonds entirely through the endoscope. Furthermore, we demonstrate a new method for measuring distances based on measurements of the Rabi frequency.