A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

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Principles Of Optics Electromagnetic Theory Of Propagation Interference And Diffraction Of Light

Physical Review B

This Review article provides an overview of the fundamental origins and important applications of the main spin–orbit interaction phenomena in modern optics that play a crucial role at subwavelength scales. Light carries both spin and orbital angular momentum. These dynamical properties are determined by the polarization and spatial degrees of freedom of light. Nano-optics, photonics and plasmonics tend to explore subwavelength scales and additional degrees of freedom of structured — that is, spatially inhomogeneous — optical fields. In such fields, spin and orbital properties become strongly coupled with each other. In this Review we cover the fundamental origins and important applications of the main spin–orbit interaction phenomena in optics. These include: spin-Hall effects in inhomogeneous media and at optical interfaces, spin-dependent effects in nonparaxial (focused or scattered) fields, spin-controlled shaping of light using anisotropic structured interfaces (metasurfaces) and robust spin-directional coupling via evanescent near fields. We show that spin–orbit interactions are inherent in all basic optical processes, and that they play a crucial role in modern optics.

Spin-orbit interactions of light

Imaging polarimetry has emerged over the past three decades as a powerful tool to enhance the information available in a variety of remote sensing applications. We discuss the foundations of passive imaging polarimetry, the phenomenological reasons for designing a polarimetric sensor, and the primary architectures that have been exploited for developing imaging polarimeters. Considerations on imaging polarimeters such as calibration, optimization, and error performance are also discussed. We review many important sources and examples from the scientific literature.

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Review of passive imaging polarimetry for remote sensing applications

We show how several probability distributions can be restored from the distribution of one single observable. The method is directly applicable to polarimetric measurements with limited control over the experimental conditions.

Reconstructing anisotropic polarizabilities from a single polarimetric measurement

We present a spatiotemporal coherence-gated dynamic light scattering technique that permits continuously assess non-equilibrium, long-term dynamical processes. We demonstrate it experimentally by characterizing the evolution of mechanical properties in viscoelasticity-modulated biopolymer hydrogels.

Continuous characterization of viscoelasticity-modulated biopolymer hydrogels

Scattered light contains information about the obstruction that scattered it. Using three dimensional polarimetry, we determine the shape anisotropy of scattering particles.

Scattering of Three Dimensional Optical Radiation

We present an optical technique capable of measuring simultaneously hydrodynamic size and mass density of colloidal suspensions. The technique is fiber optic-based, non-invasive, and permits continuous online measurements over a broad range of colloidal parameters.

Real-time full characterization of colloidal dynamics

Near-field measurements on mesoscopic, strongly scattering media and systematic numerical calculations are used to establish the dependence between intensity distributions and the statistical homogeneity of random structures with controlled disorder.

Aristide Dogariu

Papers

Reconstructing anisotropic polarizabilities from a single polarimetric measurement

Continuous characterization of viscoelasticity-modulated biopolymer hydrogels

Scattering of Three Dimensional Optical Radiation

Real-time full characterization of colloidal dynamics

Near-Field Intensity Fluctuations: the Role of Disorder Correlations