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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

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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.