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Tapered Optical Fibers Coated with Rare-Earth Complexes for Quantum Applications.

Ori Ezrah Mor1, Tal Ohana1, Adrien Borne1

  • 1Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 7610001, Israel.

ACS Photonics
|August 23, 2022
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Summary

Researchers developed a novel hybrid platform for optical systems by coating tapered optical fibers with rare-earth ion complexes. This approach minimizes inhomogeneity and enhances optical properties, matching state-of-the-art doped crystals.

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Area of Science:

  • Solid-state optics
  • Quantum technology
  • Materials science

Background:

  • Rare-earth (RE) ions in crystals and fibers are crucial for lasers, telecom, and quantum applications.
  • Doped crystals offer homogeneity, while doped fibers provide robust waveguides, but these platforms are typically exclusive.
  • Existing methods face limitations in controlling the ion environment and minimizing optical signal loss.

Purpose of the Study:

  • To introduce a hybrid platform combining the benefits of doped crystals and fibers.
  • To develop a method for isolating single rare-earth ions in a controlled environment.
  • To enhance the performance of optical systems by minimizing inhomogeneity and suppressing decay channels.

Main Methods:

  • Coating a tapered silica optical fiber with a monolayer of rare-earth ion complexes.
  • Utilizing highly luminescent Ytterbium (Yb3+) complexes, specifically Yb3+[Zn(II)MC(QXA)], to isolate individual ions.
  • Characterizing the optical transitions and excited-state lifetime of Yb3+ ions on the hybrid platform.

Main Results:

  • Demonstrated successful deposition of Yb3+ complexes onto a tapered optical fiber.
  • Confirmed retention of beneficial optical transitions of Yb3+ after deposition.
  • Observed an excited-state lifetime exceeding 0.9 ms, comparable to state-of-the-art Yb-doped crystals.

Conclusions:

  • The hybrid platform offers a new approach for creating advanced optical devices.
  • Coating optical fibers with tailored rare-earth ion complexes minimizes inhomogeneity and enhances optical properties.
  • This method provides a viable alternative to traditional doping techniques for applications in quantum technology and telecommunications.