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Dipole radiation into grating structures

Rigneault1, Lemarchand, Sentenac

  • 1Laboratoire d'Optique des Surfaces et des Couches Minces, Ecole Nationale Superieure de Physique de Marseille, Domaine Universitaire de St Jerome, France. herve.rigneault@enspm.u-3mrs.fr

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|June 13, 2000
PubMed
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Crossed gratings can couple all light from an electric source into guided modes. This electromagnetic analysis shows potential for controlling light emission direction, useful for microcavity structures.

Area of Science:

  • Electromagnetism
  • Optics
  • Materials Science

Background:

  • Controlling light emission from sources within structures is crucial for optical devices.
  • Grating structures offer possibilities for manipulating light propagation.

Purpose of the Study:

  • To analyze the electromagnetic radiation of an electric source within grating structures.
  • To investigate the light-coupling capabilities of crossed gratings.
  • To explore applications in spontaneous emission control.

Main Methods:

  • Detailed electromagnetic analysis using the differential method.
  • Application of the scattering-matrix algorithm.
  • Computation of far-field radiation patterns for various grating etch depths.

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Main Results:

  • Crossed gratings can couple the totality of emitted light into the structure's guided modes.
  • The emission can be confined in a direction near the sample normal.
  • Etching depth significantly influences the radiation patterns.

Conclusions:

  • Crossed gratings provide an effective method for total light coupling into guided modes.
  • The directional confinement of light emission is a key finding with implications for microcavity applications.
  • This analysis offers a pathway for advanced control over light-source interactions in nanophotonic devices.