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Area of Science:

  • Nanophotonics
  • Quantum Optics
  • Materials Science

Background:

  • Scalable quantum photonic technologies need integrated photonic components.
  • Hexagonal boron nitride (hBN) shows promise due to hyperbolic phonon-polaritons and quantum emitters.
  • Fabricating high-quality optical resonators in hBN is crucial for on-chip applications.

Purpose of the Study:

  • To design and engineer suspended photonic crystal cavities from hBN.
  • To demonstrate high quality factors and tunable properties of these cavities.
  • To advance the development of on-chip nanophotonic circuits using van der Waals materials.

Main Methods:

  • Design and fabrication of suspended hexagonal boron nitride (hBN) photonic crystal cavities.
  • Characterization of cavity quality (Q) factors.
  • Deterministic, iterative tuning of individual cavities using electron-beam-induced etching (EBIE).

Main Results:

  • Achieved quality (Q) factors exceeding 2000 for hBN cavities.
  • Demonstrated successful deterministic and iterative tuning of cavities via EBIE.
  • Showed minimal degradation of Q-factors after tuning, preserving optical performance.

Conclusions:

  • Engineered tunable, high-Q hexagonal boron nitride (hBN) photonic crystal cavities.
  • Established a robust processing method for hBN nanophotonics.
  • Opened new possibilities for integrated quantum photonics, polaritonics, and cavity quantum electrodynamics (QED).