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Updated: May 28, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Optically controllable photonic structures with zero absorption.

Chris O'Brien1, Olga Kocharovskaya

  • 1Department of Physics and Astronomy, Texas A&M University, College Station, 77843-4242, USA. cobrien.physics@gmail.com

Physical Review Letters
|October 27, 2011
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate periodic modulation of refractive index in atomic media without absorption or gain. This breakthrough enables the creation of controllable photonic structures using external optical fields.

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Area of Science:

  • Atomic physics
  • Optical engineering
  • Materials science

Background:

  • Controlling light-matter interactions is crucial for advanced optical technologies.
  • Periodic modulation of material properties can lead to novel photonic phenomena.
  • Achieving dynamic control over refractive index without introducing losses remains a challenge.

Purpose of the Study:

  • To demonstrate the possibility of periodic refractive index modulation in a homogeneous resonant atomic medium.
  • To achieve this modulation while maintaining vanishing absorption or gain.
  • To propose a method for creating coherently controllable photonic structures.

Main Methods:

  • Utilizing periodic resonant enhancement of the refractive index.
  • Controlling the enhancement with an external optical field.
  • Exploring implementation in rare-earth doped crystals with excited state absorption.

Main Results:

  • Successfully showed the possibility of periodic refractive index modulation in space and/or time.
  • Demonstrated that this modulation can be achieved with vanishing absorption or gain.
  • Proposed a practical scheme for realizing these controllable photonic structures.

Conclusions:

  • Periodic refractive index modulation in resonant atomic media is achievable without significant optical loss.
  • This technique allows for the coherent control of photonic structures.
  • Rare-earth doped crystals offer a promising platform for implementing this method.