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Dispersion engineering for vertical microcavities using subwavelength gratings.

Zhaorong Wang1, Bo Zhang1, Hui Deng1

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.

Physical Review Letters
|March 13, 2015
PubMed
Summary
This summary is machine-generated.

We demonstrate a new method to engineer the energy-momentum dispersion in semiconductor microcavities using subwavelength gratings. This technique allows for precise control over optical properties, enabling novel cavity quantum electrodynamics systems.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Quantum Physics

Background:

  • Vertical semiconductor microcavities are crucial for light-matter interactions.
  • Controlling the energy-momentum dispersion is key to tailoring optical properties.
  • Existing methods may limit cavity quality factor or active media integration.

Purpose of the Study:

  • To present a novel method for modifying the energy-momentum dispersion of vertical semiconductor microcavities.
  • To demonstrate the use of high-index-contrast subwavelength gratings (SWGs) as tunable cavity mirrors.
  • To enable the design of new cavity quantum electrodynamics (CQED) systems.

Main Methods:

  • Utilizing high-index-contrast subwavelength gratings (SWGs) as cavity mirrors.
  • Analyzing the angular dependence of the SWG reflection phase for dispersion engineering.
  • Designing specific dispersion profiles, including reduced/increased density of states and double-well shapes.

Main Results:

  • Successfully modified the energy-momentum dispersion of vertical semiconductor microcavities.
  • Demonstrated dispersion engineering principles through SWG reflection phase analysis.
  • Achieved engineered dispersions with tailored energy density of states and novel shapes.
  • Maintained high cavity quality factors and protected active media integration.

Conclusions:

  • Subwavelength gratings offer a powerful tool for dispersion engineering in microcavities.
  • This method is compatible with high-quality factor cavities and active media.
  • Enables the development of advanced cavity quantum electrodynamics systems with designed optical properties.