Faculty of Natural Sciences and Mathematics
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Item type:Publication, Fermat's principle of least time in the presence of uniformly moving boundaries and media(IOP Publishing, 2007-02-13); Aleksandar SkeparovskiThe refraction of a light ray by a homogeneous, isotropic and non-dispersive transparent material half-space in uniform rectilinear motion is investigated theoretically. The approach is an amalgamation of the original Fermat's principle and the fact that an isotropic optical medium at rest becomes optically anisotropic in a frame where the medium is moving at a constant velocity. Two cases of motion are considered: a) the material half-space is moving parallel to the interface; b) the material half-space is moving perpendicular to the interface. In each case, a detailed analysis of the obtained refraction formula is provided, and in the latter case, an intriguing backward refraction of light is noticed and thoroughly discussed. The results confirm the validity of Fermat's principle when the optical media and the boundaries between them are moving at relativistic speeds. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Polarization Measurements - A Numerical Approach(2004-01-21)We developed a specific numerical fitting procedure, based on the least squares method, to calculate the parameters of the polarization ellipse by only using a single polarizer and a detection device for measuring the outgoing intensities. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Fraunhofer diffraction of a Laguerre–Gaussian laser beam by fork-shaped grating(Informa UK Limited, 2011-01-20); Janicijevic, LjiljanaIn this article we present a theoretical study for Fraunhofer diffraction of a Laguerre-Gaussian laser beam with zeroth radial mode number and azimuthal mode number l by diffractive grating with embedded fork-shaped dislocations of integer order p. Analytical expressions describing the diffracted wave field amplitude and intensity distributions in the Fourier plane are deduced and analyzed. They are also followed by the vortex radii expressions.