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Self-localization mechanisms and conditions of laser radiation in a cold collisionless plasma of spherical microcavity have been studied taking into account the striction nonlinearity and the relativistic effects connected with the stimulated oscillatory movement of electrons. A spherical plasmon localized close to the centre of microcavity has been shown to excite under nonlinear interaction of whispering-gallery modes with electron plasma. It is determined that the realization of self-localized spherical structures of electromagnetic field and spherical plasmons inside the microcavity filled with electron plasma is caused by manifestation of relativistic nonlinearity of the medium.

Localization of plasmon under nonlinear interaction of whispering-gallery modes with electron plasma of spherical microcavity