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Related Experiment Video

Updated: May 30, 2026

Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

All-optically controlled concurrent slow-fast light pair.

Anil K Patnaik1, Sukesh Roy, James R Gord

  • 1Air Force Research Laboratory, Propulsion Directorate, Wright-Patterson AFB, Ohio 45433, USA. anil.patnaik@wpafb.af.mil

Optics Letters
|August 18, 2011
PubMed
Summary
This summary is machine-generated.

Researchers achieved simultaneous control over light speeds, creating slow-fast light pairs with high group indices and gain. This breakthrough enables concurrent normal and anomalous dispersion in optical systems.

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Light-matter interactions

Background:

  • Electromagnetically induced transparency (EIT) enables manipulation of light propagation.
  • Nonlinear optical processes, particularly third-order nonlinearity (χ((3))), are crucial for generating gain and controlling dispersion.
  • Controlling group velocities of light is essential for optical buffering and signal processing.

Purpose of the Study:

  • To demonstrate concurrent realization of normal and anomalous dispersion for a pair of weak probes.
  • To achieve independent and simultaneous control over the group velocities of these probes.
  • To explore the potential for creating slow-fast, slow-slow, and fast-fast light pairs within the same optical element.

Main Methods:

  • Utilizing a doubly driven double-ladder atomic configuration.
  • Employing electromagnetically induced transparency (EIT) for slow light.
  • Leveraging a χ((3))-based gain process to control light propagation and introduce gain.
  • Performing analytical and numerical simulations to verify the proposed scheme.

Main Results:

  • Concurrent normal and anomalous dispersion achieved for a pair of weak probes.
  • Realization of a slow-fast light pair with group indices of approximately ±10^7.
  • Observed gain or relatively small absorption (down to ~25%) in the slow-fast light pair.
  • Identified parameter regions for concurrent slow-slow and fast-fast light pairs with reduced absorption.

Conclusions:

  • The proposed doubly driven double-ladder configuration offers a versatile platform for controlling light propagation.
  • Simultaneous manipulation of group velocities and dispersion regimes (normal and anomalous) is feasible.
  • The findings have implications for developing advanced optical delay lines, buffers, and signal processing devices.