Abstract
Plasma-chemical gas-phase deposition has been used to fabricate a luminescent asymmetric planar waveguide based on an amorphous silicon carbide film of micron thickness deposited on a circular quartz substrate with a transparent cylindrical side surface. When photoluminescence is excited in an asymmetric planar waveguide, peaks of linearly polarized (P and S) radiation are recorded in the emission spectra from the side surface of the substrate, caused by emission in the leaky modes of the planar waveguide. A spherical mirror converted the radiation coming out of the side surface of the sample substrate located at the center of the mirror into a cylindrical light beam. The spectra of the P- and S-polarized radiation have been studied at different points of the cross section of the cylindrical beam. It is shown that the cylindrical beam possesses radial and azimuthal polarizations.
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