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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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Journal ArticleDOI
TL;DR: A wave optics numerical analysis of the force and torque on a semicylindrical optical wing is presented and it is found that the dominant rotationally stable angle of attack at α≈-15° is relatively invariant to changes in radius and refractive index.
Abstract: A wave optics numerical analysis of the force and torque on a semicylindrical optical wing is presented. Comparisons with a recently reported ray optics analysis indicate good agreement when the radius is large compared with the wavelength of light, as expected. Surprisingly, we find that the dominant rotationally stable angle of attack at α≈−15° is relatively invariant to changes in radius and refractive index. However, the torsional stiffness at the equilibrium point is found to increase, approximately, as the cubic power of the radius. Quasi-resonant internal modes of light produce complex size-dependent variations of the angle and magnitude of the optical lift force.

36 citations

Journal ArticleDOI
TL;DR: In this article, a closed-form expression of the surface integral for plane-wave incidence and far-field observation is derived for both the frequency and time domains, where the integral is converted to the time domain and interpreted as a Radon transform.
Abstract: Physical optics (PO) is a well-known asymptotic technique for evaluating the fields scattered from an object. Evaluation of a surface integral forms the crux of this technique. In this paper, the PO integral is formulated for plane-wave incidence and far-field observation. Then, this integral is converted to the time domain and interpreted as a Radon transform. When the integration domain is a triangle, this interpretation yields a closed-form expression that can be employed in both the frequency and time domains. The efficacy of using the derived closed-form expression in the frequency domain is demonstrated through numerical examples. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 284–288, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20612

36 citations

Journal ArticleDOI
TL;DR: In this article, a high-frequency analysis is presented for the scattering by vertices in a curved surface with curvilinear edges and relatively general boundary conditions, under the physical optics (PO) approximation.
Abstract: A new high-frequency analysis is presented for the scattering by vertices in a curved surface with curvilinear edges and relatively general boundary conditions, under the physical optics (PO) approximation. Both, impenetrable (e.g., impedance surface, coated conductor) as well as transparent thin sheet materials (e.g., thin dielectric, or frequency selective surface) are treated, via their Fresnel reflection and transmission coefficients. The PO scattered field is cast in a uniform theory of diffraction (UTD) ray format and comprises geometrical optics, edge and vertex diffracted rays. The contribution of this paper is twofold. First, we derive PO-based edge and vertex diffraction coefficients for sufficiently thin but relatively arbitrary materials, while in the literature most of the results (especially for vertex diffraction) are valid only for perfectly conducting objects. Second, the shadow boundary transitional behavior of edge and vertex diffracted fields is rigorously derived for the curved geometry case, as a function of various geometrical parameters such as the local radii of curvature of the surface, of its edges and of the incident ray wavefront. For edge diffracted rays, such a transitional behavior is found to be the same as that obtained heuristically in the original UTD. For vertex diffracted rays, the PO-based transitional behavior is a novel result providing offers clues to generalize a recent UTD solution for a planar vertex to treat the present curved vertex problem. Some numerical examples highlight the accuracy and the effectiveness of the proposed ray description.

36 citations

Journal ArticleDOI
TL;DR: A model of a non-modulated pyramid wavefront sensor (P-WFS) based on Fourier optics has been presented and it was observed that in poor visibility the new calibration is better than the conventional.
Abstract: A model of a nonmodulated pyramid wavefront sensor (P-WFS) based on Fourier optics has been presented. Linearizations of the model represented as Jacobian matrices are used to improve the P-WFS phase estimates. It has been shown in simulations that a linear approximation of the P-WFS is sufficient in closed-loop adaptive optics. Also a method to compute model-based synthetic P-WFS command matrices is shown, and its performance is compared to the conventional calibration. It was observed that in poor visibility the new calibration is better than the conventional.

36 citations

Journal ArticleDOI
TL;DR: In this paper, a reliable method based on facet-based asymptotical model, geometrical optics and physical optics (GO-PO) was developed to calculate composite scattering from 3D complex ship targets over a rough sea surface.
Abstract: A reliable method based on facet-based asymptotical model, geometrical optics and physical optics (GO-PO) is developed to calculate composite scattering from 3-D complex ship targets over a rough sea surface. The backward ray-tracing is described to identify the visibilities of patches to the incident wave and the reflected wave of other patches on the target and facets on the sea surface. Both the scattering from target, including higher orders of scattering and the interactions between the target and rough sea surface, can be treated handily by the proposed GO-PO method. The accuracy of the target scattering and composite scattering is demonstrated by comparing with Multi-level fast multipole method (MLFMM), method of equivalent currents, and four-path model. Moreover, numerical examples of radar cross section estimation, electric current distribution, and synthetic aperture radar imagery simulation from a real ship target over a randomly rough sea surface are presented and discussed.

36 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202357
2022157
202196
2020140
2019141
2018162