Topic
Physical optics
About: Physical optics is a research topic. Over the lifetime, 5342 publications have been published within this topic receiving 101388 citations. The topic is also known as: wave optics.
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TL;DR: In this article, a comparison between the statistical properties of phase and power signals from a homodyne reflectometer on the STOR-M tokamak and simulated signals from two-dimensional distorted surface model is made.
Abstract: A comparison is made between the statistical properties of phase and power signals from a homodyne reflectometer on the STOR‐M tokamak and simulated signals from a two‐dimensional distorted surface model. Experimental results from edge density fluctuations show phase fluctuations of less than half a fringe with a Gaussian distribution and no phase ramping. Reflected power fluctuations are substantial (up to 45%) and are non‐Gaussian distributed. Both phase and power signals display broadband turbulent frequency spectra with spectral indexes of −3.5. Fluctuations in the scattered electric field are calculated in the model using physical optics principles with a Gaussian reflectometer incident beam profile and structured surface distortions to replicate variations in the plasma cutoff layer. Simulation results display a wide range of features depending on three parameters, surface fluctuation amplitude, transverse wavenumber spectrum, and incident beam width. With the beam width fixed by the experiment (50 ...
22 citations
TL;DR: The principles behind the design and operation of polarization-based optics for nuclear resonant scattering of synchrotron radiation are discussed in this article, where a general approach to optical activity is introduced, and the polarization dependence of the index of refraction is calculated for nuclear forward scattering for a medium with unidirectional symmetry.
Abstract: The principles behind the design and operation of polarization‐based optics for nuclear resonant scattering of synchrotron radiation are discussed. With perfect single crystals and collimated X‐rays emitted from undulator‐based third‐generation synchrotron radiation sources, polarization‐selective optics with a sensitivity of parts per billion can be obtained. A general approach to optical activity is introduced, and the polarization dependence of the index of refraction is calculated for nuclear forward scattering for a medium with unidirectional symmetry. Some recent experimental results are reviewed and future applications are discussed.
22 citations
17 Feb 1994
TL;DR: A vector beam propagation method for the modeling and simulation of electromagnetic wave propagation in optical guided-wave devices is proposed, based on a finite-difference scheme which takes into account the boundary conditions of the transverse electric fields over the waveguide cross section.
Abstract: Modeling and simulation are essential to the development of integrated optical guided- wave devices. In principle, the problems can be described precisely by Maxwell equations with given boundary conditions and constitutive relations that are connected with other physical aspects. These equations may be solved by various existing techniques in electromagnetics and other branches of physics. In practice, however, the extremely high ratio of device length and optical wavelength makes many well-established methods in other areas such as microwaves not feasible or effective. Despite constant effort in adapting and applying various sophisticated analytical and numerical methods to guided-wave optics in the past two decades, the most popular approaches in the field are still the effective index method (EIM) W, the coupled-mode theory (CMT) [2], and the beam propagation method (BPM)[3].
22 citations
TL;DR: Edge-dislocation waves, created in the diffraction of plane waves by an impedance half-plane, are examined by the method of modified theory of physical optics and the integrals are decomposed according to their boundaries and evaluated by using uniform asymptotic methods.
Abstract: Edge-dislocation waves, created in the diffraction of plane waves by an impedance half-plane, are examined by the method of modified theory of physical optics. The integrals, obtained by a related technique, are decomposed according to their boundaries and evaluated by using uniform asymptotic methods. The results are plotted and are investigated numerically.
22 citations
TL;DR: In this paper, an analytical method based on physical optics and the method of equivalent currents (MEC), in conjunction with the quasi-stationary method, was developed to predict the bistatic field scattered by a multiple skew-plated rotating fan.
Abstract: The electromagnetic scattering of rotating blades is investigated both theoretically and experimentally. We have developed an analytical method based on physical optics (PO) and the method of equivalent currents (MEC), in conjunction with the quasi-stationary method. We have predicted the bistatic field scattered by a multiple skew-plated rotating fan. Comparisons with a numerical calculation based on the method of moments and with measurements have given very satisfactory results. A comparison with previously published results has also been carried out. Physical interpretations are given both in time and frequency domains. Our analytical model correctly predicts the spreading and magnitude of the frequency response as a function of the scatterer's skew angles, its rotation frequency, and the directions of incidence and scattering.
22 citations