Storing light near an exceptional point

Area of Science:

• Quantum Optics
• Nonlinear Optics
• Materials Science

Background:

• Light propagation is typically limited by its zero rest mass.
• Strong light-matter interactions in atomic systems can slow or halt light pulses.
• Exceptional points (EPs) are singularities in non-Hermitian systems that induce abrupt changes in dispersion.

Purpose of the Study:

• To experimentally demonstrate room-temperature light storage near an exceptional point.
• To utilize nonlinear Brillouin scattering in a chip-scale optical microcavity for light manipulation.
• To explore the potential of Parity-Time (PT) symmetry in optical-acoustical hybrid modes for slow and fast light phenomena.

Main Methods:

• Fabrication of a chip-scale optical microcavity (90-μm radius).
• Induction of nonlinear Brillouin scattering to create an exceptional point.
• Construction of Parity-Time (PT) symmetry in optical-acoustical hybrid modes.
• Observation of Brillouin scattering-induced absorption (BSIA) for slow and fast light effects.

Main Results:

• Successful demonstration of light storage at room temperature near an exceptional point.
• Achieved light storage in the smallest platform to date (90-μm radius optical microcavity).
• Observed a critical point transition from slow-to-fast light, enabling light pulse storage up to half a millisecond.

Conclusions:

• The developed compact, room-temperature scheme offers a novel method for storing light pulses.
• This technology has significant potential for applications in all-optical communications and quantum information processing.
• The use of exceptional points and PT symmetry in microcavities provides a powerful platform for light manipulation.