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Published byDeirdre Lee Modified over 9 years ago
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Dept. Elect. Eng. Technion – Israel Institute of Technology Rotating Beams Yoav Y. Schechner 1 Joint studies with J. Shamir, R. Piestun, A. Greengard
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Yoav Schechner Waves having a Phase Dislocation propagation direction a helical wavefront
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Yoav Schechner propagation direction helical wavefront surface local k -vectors (normals to the wavefront surface) have azimuthal component local k -vectors orbital angular momentum in the wave k vector : momentum Waves having a Phase Dislocation
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Schechner & Shamir propagation direction Isotropic dislocation: helical wavefront propagation direction Anisotropic dislocation Parameterizations Morphological: Stretch angle Eccentricity Dark fringe: a limit of eccentricity Physical: Superposition of isotropic waves Dark fringe: annihilation of isotropic dislocations Angular momentum Anisotropic Dislocations
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Rotating PSF Schechner
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Schechner et. al, Physical Review E 1996 Computer-Generated Hologram (Diffractive Optical Element)
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Utopian Geometric PSF Width changes linearly with z z Yoav Schechner
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Standard PSF Width changes with z …by just a 2 nd order z
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Rotating PSF Standard PSF Greengard, Schechner, Piestun
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Greengard, Schechner, Piestun: Depth from diffracted rotation
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