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Scar Selection in an Optical Fibre

100%

Doya V., Legrand O., Michel C., Mortessagne F.

Acta Physica Polonica A

2007

vol. 112

issue 4

607-617

A multimode optical fiber with a D-shaped cross-section has already been proved to constitute a privileged system to image wave functions of a chaotic system. Nevertheless, diffraction of light at the fiber input precludes the excitation of individual wave functions and particularly the scar modes we want to investigate. We show that a mechanism of scar modes selection can be induced by the introduction of a localized gain.

Direct Observation of Localized Modes in an Open Disordered Microwave Cavity

88%

Mortessagne F., Laurent D., Legrand O., Sebbah P., Vanneste C.

Acta Physica Polonica A

2007

vol. 112

issue 4

665-672

We present measurements of the spatial intensity distribution of localized modes in a two-dimensional open microwave cavity randomly filled with cylindrical dielectric scatterers. The robustness of these modes with respect to a modification of the boundaries of the scattering region is successfully established. From a comparison with numerically calculated modes, we can extract precise values of the localization length which are in agreement with the measured spectral widths. These results constitute unambiguous signatures of the existence of strongly localized electromagnetic modes in two-dimensional open random media.

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2 Acta Physica Polonica A

2 2007

2 Legrand O.

2 Mortessagne F.

1 Doya V.

1 Laurent D.

1 Michel C.

1 Sebbah P.

1 Vanneste C.

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Scar Selection in an Optical Fibre

Direct Observation of Localized Modes in an Open Disordered Microwave Cavity