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Photothermally induced transparency.

Jinyong Ma1, Jiayi Qin1, Geoff T Campbell1

  • 1Centre for Quantum Computation and Communication Technology, Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia.

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|March 5, 2020
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Summary
This summary is machine-generated.

We introduce photothermally induced transparency (PTIT), a new optical effect where heating makes materials transparent. This phenomenon allows for controlling light propagation, enabling slow light with potential applications in optical devices.

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Area of Science:

  • Optics and Photonics
  • Nonlinear Optics
  • Thermal Optics

Background:

  • Induced transparency is a key optical phenomenon where opaque materials become transparent under specific conditions.
  • Established mechanisms include electromagnetically induced transparency (EIT) in atomic systems and optomechanically induced transparency (OMIT).
  • These effects are crucial for controlling light-matter interactions and developing advanced optical devices.

Purpose of the Study:

  • To introduce and investigate a novel mechanism for induced transparency: photothermally induced transparency (PTIT).
  • To explore the potential of PTIT in modifying optical resonator behavior and controlling light propagation.
  • To demonstrate the feasibility of achieving slow and fast light using PTIT.

Main Methods:

  • Investigated nonlinear optical behavior in an optical resonator induced by optical heating.
  • Analyzed the suppression of coupling between the optical resonator and a traveling optical field via PTIT.
  • Characterized the dispersion properties of the resonator to demonstrate slow and fast light effects.

Main Results:

  • Successfully demonstrated photothermally induced transparency (PTIT) in an optical resonator.
  • Observed suppression of resonator-field coupling, analogous to EIT and OMIT.
  • Achieved tunable slow and fast light phenomena due to modified resonator dispersion.
  • Measured a narrow PTIT bandwidth of 2π × 15.9 Hz, indicating potential for very low group velocities.

Conclusions:

  • PTIT presents a new pathway for achieving induced transparency through thermal nonlinearities.
  • The ability to control light propagation, including slow light, opens avenues for novel optical device applications.
  • The slow thermal response dictates the bandwidth, offering unique characteristics compared to other induced transparency mechanisms.