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Related Experiment Video

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High-resolution Fiber-optic Microendoscopy for in situ Cellular Imaging
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Fiber-tip endoscope for optical and microwave control.

Stefan Dix1, Jonas Gutsche1, Erik Waller2

  • 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Str. 46, 67663 Kaiserslautern, Germany.

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We developed a fiber-optic endoscope with integrated radio frequency (RF) capabilities for simultaneous optical and RF measurements. This device achieves high sensitivity for probing nitrogen-vacancy centers in diamond, enabling new microscopic sensing applications.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Traditional optical setups for probing fluorescent particles are often bulky and complex.
  • Simultaneous optical and radio frequency (RF) excitation and detection in a compact format is challenging.
  • Nitrogen-vacancy (NV) centers in diamond are sensitive quantum probes but require specialized instrumentation.

Purpose of the Study:

  • To develop a robust, fiber-based endoscope enabling simultaneous optical and RF signal delivery and detection.
  • To integrate a direct-laser-written silver RF antenna structure with an optical fiber.
  • To demonstrate the endoscope's capability for sensitive measurements of NV centers in diamond.

Main Methods:

  • Fabrication of a fiber-optic endoscope with a direct-laser-written silver RF antenna on the cladding.
  • Simultaneous optical excitation and RF probing of NV-doped microdiamonds.
  • Optically detected magnetic resonance (ODMR) measurements using the endoscope.
  • Comparison of magnetic sensitivity with confocal microscopy.

Main Results:

  • Achieved optimal RF intensity at the fiber facet due to near-field coupling.
  • Demonstrated a magnetic sensitivity of 17.8 nT/Hz for NV centers using the fiber endoscope.
  • Confirmed that the silver RF structure minimally impacts optical performance.
  • Showcased the device's potential for precise distance measurements via Rabi oscillations.

Conclusions:

  • The developed fiber-based endoscope offers a compact solution for simultaneous optical and RF measurements.
  • The device enables sensitive probing of quantum defects like NV centers, with potential for broader applications in fluorescent particle analysis.
  • This technology paves the way for miniaturized sensing systems combining optical and RF functionalities.