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Millisecond Photon Lifetime in a Slow-Light Microcavity.

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Researchers achieved ultralong photon storage times in optical microcavities by using slow-light effects. This breakthrough in integrated nanophotonics resulted in a record quality factor of 3×10^12, paving the way for advanced optical memory.

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Area of Science:

  • Integrated nanophotonics
  • Quantum optics
  • Materials science

Background:

  • Optical microcavities are crucial for integrated nanophotonics, with current quality (Q) factors reaching 10^11 in single-crystal resonators and 10^10 in silica/glass.
  • Achieving ultralong photon storage times is essential for advanced photonic devices.

Purpose of the Study:

  • To enhance photon lifetime in active whispering-gallery-mode (WGM) microresonators by several orders of magnitude.
  • To overcome limitations imposed by fabrication imperfections and residual absorption in optical microcavities.
  • To explore the potential of slow-light effects for novel optical memory applications.

Main Methods:

  • Utilized an erbium-doped fluoride glass microsphere as an active WGM microresonator.
  • Induced slow-light effects through coherent population oscillations.
  • Achieved strong dispersion in the WGM, with a group index (n_g) of approximately 10^6.

Main Results:

  • Demonstrated a photon lifetime of up to 2.5 milliseconds at room temperature.
  • Attained a record quality factor of 3×10^12 at a wavelength of 1530 nm.
  • Successfully circumvented fabrication imperfections and residual absorption using the slow-light effect.

Conclusions:

  • The developed active WGM microresonator with slow-light effects offers a significant enhancement in photon storage time.
  • This technology presents a new pathway for creating optical memory microarrays with unprecedented storage capabilities.
  • The achieved Q factor of 3×10^12 highlights the potential of this approach for future integrated photonic systems.