منابع مشابه
Photonic crystal multiple diffraction observed by angular-resolved reflection measurements
Angular-resolved reflection measurements suggest that higher-order Miller-index crystal planes of a fcc photonic crystal reflect specularly about the normal to the 111 planes. We suggest that this phenomenon results from a two-step diffraction process where light is first Bragg diffracted by higher-order Miller-index crystal planes and is then two-dimensionally diffracted by periodicities withi...
متن کاملOrbital and spin angular momentum in conical diffraction
Abstract The angular momentum Jinc of a light beam can be changed by passage through a slab of crystal. When the beam is incident along the optic axis of a biaxial crystal, which may also possess optical activity (chirality), the final angular momentum J can have both orbital (Jorb) and spin (Jsp) contributions, which we calculate paraxially exactly for arbitrary biaxiality and chirality and in...
متن کاملGeneration of continuously tunable fractional optical orbital angular momentum using internal conical diffraction.
When a left-circularly polarised Gaussian light beam, which has spin angular momentum (SAM) J(sp) = sigmah = 1h per photon, is incident along one of the optic axes of a slab of biaxial crystal it undergoes internal conical diffraction and propagates as a hollow cone of light in the crystal. The emergent beam is a superposition of equal amplitude zero and first order Bessel like beams. The zero ...
متن کاملEffective Method of Solving the Waves Diffraction Problems by Impedance Scatterers with Angular Boundary
In this paper, we present the results of solution of three-dimensional electromagnetic scattering problems by impedance bodies of revolution, using the Pattern Equations Method (PEM). The good convergence this results is shown on the example of a prolate spheroid and a cylinder with spherical rounding. Key-Words: Scattering pattern, scatterer, impedance, prolate spheroid, cylinder
متن کاملSupplemental Material Variable Aperture Light Field Photography: Overcoming the Diffraction-limited Spatio-angular Resolution Tradeoff
1. Additional Details for Wigner PSFs The Wigner Distribution Function (WDF) is a joint representation of space and spatial frequency. It can be considered as the local frequency spectrum of the signal [2]. Spatial frequencies are linked to the direction of propagation θ of light rays as u = sin θ λ . Hence, the WDF is sometimes also referred to as the ray spread function. It has been explored ...
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2008
ISSN: 1367-2630
DOI: 10.1088/1367-2630/10/10/103013