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, the authors investigated the problem of plane wave diffraction by a wedge in the context of the spectral domain approach, which exploits the relationship between the induced current on a scatterer and its far field, and showed how the exact solution to the wedge diffraction problem can be manipulated in a form which enables one to interpret the far scattered field as the Fourier transform of the physical optics current on the two faces of the wedge augmented by the fringe current near the tip of a wedge.
Abstract: The canonical problem of plane wave diffraction by a wedge in the context of the spectral domain approach which exploits the relationship between the induced current on a scatterer and its far field is investigated. It is shown how the exact solution to the wedge diffraction problem can be manipulated in a form which enables one to interpret the far scattered field as the Fourier transform of the physical optics (PO) current on the two faces of the wedge augmented by the fringe current near the tip of the wedge. A uniform asymptotic expansion for the total field which slightly modifies the Ansatz in the uniform asymptotic theory of electromagnetic edge diffraction is constructed.
18 citations
TL;DR: In this article, the reflectometer phase and power sensitivity from a two-dimensional physical optics model were analyzed for fluctuation and density profile measurements, and it was shown that a tightly focused reflectometer beam was more appropriate for fluctuations, while a larger beam diameter appeared more suitable for density profiles.
Abstract: Simulation results of the reflectometer phase and power sensitivity from a two-dimensional physical optics model show that a tightly focused reflectometer beam is most appropriate for fluctuation measurements, while a larger beam diameter appears more appropriate for density profile measurements.
18 citations
22 May 2011
TL;DR: In supercooled nanodisordered KLTN as mentioned in this paper, light propagation where wavelength is cancelled by nonlinearity ceases: beams form solitons of any size and intensity, even arbitrarily low, allowing ultraresolved imaging microscopy.
Abstract: In supercooled nanodisordered KLTN we report light propagation where wavelength is cancelled by nonlinearity. Diffraction is not compensated, but ceases: beams form solitons of any size and intensity, even arbitrarily low, allowing ultraresolved imaging microscopy.
18 citations
Journal Article•
TL;DR: In this paper, the authors presented a PO-based visualization of the scattering and diffraction phenomena and tried to provide the intuitive understanding of local property of high frequency (HF) diffraction as well as the relations between PO and the ray techniques such as GTD, UTD etc.
Abstract: High frequency (HF) diffraction is known as local phenomena, and only parts of the scatterer contribute to the field such as the edge, comer and specular reflection point etc. Many HF diffraction techniques such as Geometrical Theory of Diffraction (GTD), Uniform Theory of Diffraction (UTD) and Physical Theory of Diffraction (PTD) utilize these assumptions explicitly. Physical Optics (PO), on the other hand, expresses the diffraction in terms of radiation integral or the sum total of contributions from all the illuminated parts of scatterers, while the PO currents are locally defined at the point of integration. This paper presents PO-based visualization of the scattering and diffraction phenomena and tries to provide the intuitive understanding of local property of HF diffraction as well as the relations between PO and the ray techniques such as GTD, UTD etc. A weighting named eye function is introduced in PO radiation integrals to take into account of local cancellation between rapidly oscillating contributions from adjacent currents; this extracts important areas of current distribution, whose location moves not only with the source but also with the observation point. PO visualization illustrates both local property of HF scattering and defects associated with ray techniques. Furthermore, careful examination of visualized image reminds us of the error factor in PO as applied for curved surfaces, named fictitious penetrating rays. They have been scarcely recognized if not for visualization, though they disturb the geometrical shadow behind the opaque scatterer and can be the leading error factors of PO in shadow regions. Finally, visualization is extended to slot antennas with finite ground planes by hybrid use of modified edge representation (MER) to assess the significance of edge diffraction.
18 citations
TL;DR: It is shown that metrological resolution in the detection of small phase shifts provides a suitable generalization of the degrees of coherence and polarization.
Abstract: We show that metrological resolution in the detection of small phase shifts provides a suitable generalization of the degrees of coherence and polarization. Resolution is estimated via Fisher information. Besides the standard two-beam Gaussian case, this approach provides also good results for multiple field components and nonGaussian statistics. This works equally well in quantum and classical optics.
18 citations