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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Optical modes in oxide-apertured micropillar cavities.

Cristian Bonato1, Jan Gudat, Keesjan de Vries

  • 1Huygens Laboratory, Leiden University, P.O. Box 9504, RA Leiden 2300, The Netherlands. c.bonato@tudelft.nl

Optics Letters
|November 21, 2012
PubMed
Summary

We characterized optical modes in micropillar cavities, finding they have Hermite-Gaussian profiles for easy external matching. We also linked mode splitting to the Purcell factor and developed a method to map refractive index profiles.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Micropillar cavities are key components in photonic devices.
  • Understanding their optical modes is crucial for device performance.

Purpose of the Study:

  • To experimentally characterize spectral and spatial properties of optical modes in oxide-apertured micropillar cavities.
  • To establish a relationship between transverse mode frequency splitting and the Purcell factor.
  • To develop a method for determining the refractive index distribution within the cavity.

Main Methods:

  • Detailed experimental characterization of confined optical modes.
  • Derivation of the relation between frequency splitting and Purcell factor.
  • Development of a technique using spatial mode profiles to retrieve refractive index distribution.

Main Results:

  • Observed good-quality Hermite-Gaussian profiles for optical modes.
  • Established a correlation between frequency splitting of transverse modes and the Purcell factor.
  • Successfully retrieved the confining refractive index profile from spatial mode profiles.

Conclusions:

  • Oxide-apertured micropillar cavities exhibit well-defined Hermite-Gaussian modes suitable for external coupling.
  • The derived relation provides insights into enhancing light-matter interactions via the Purcell factor.
  • The developed technique offers a non-invasive method for characterizing cavity properties.