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Total external reflection

About: Total external reflection is a research topic. Over the lifetime, 829 publications have been published within this topic receiving 22213 citations.


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TL;DR: In this paper, the surface guided electromagnetic wave (SGEW) excitation by a beam incident at a CLC film from the side of a boundary without total internal reflection (TIR) is investigated.
Abstract: Excitation of Surface guided electromagnetic waves (SGEW) of optical wave range in chiral liquid crystals (CLC) are theoretically examined in the framework of dynamical diffraction theory. In contrast to the traditionally discussed method of SGEW excitation by means of attenuated total external reflection (ATER) the SGEW excitation by a beam incident at a CLC film from the side of a boundary without total internal reflection (TIR) is investigated. In the general case an analytical description of the SEW excitation can not be carried out. It is why the limiting case allowing simplification of the problem, namely, SGEW of the second order diffraction. is examined in details.
Proceedings ArticleDOI
05 Aug 2010
TL;DR: In this article, a 45°•90°•45° triangular prism is placed with its diagonal face downwards on a convex lens surface of large radius of curvature, and an air film at the tiny contact area is seen blue.
Abstract: During total internal reflection of a beam of light in a denser medium, its electric field penetrates into the rarer medium, up to a distance of the order of wavelength. Thus, if same denser medium is also placed at a gap of the order of wavelength, reflection is partial. In this low‐cost experiment, a 45°‐90°‐45° triangular prism is placed with its diagonal face downwards on a convex lens surface of large radius of curvature. Due to unevenness in the two surfaces, there is an air film at the tiny “contact area”. Its thickness can be finely manipulated by applying pressure at the 90°‐edge of prism. At the right thickness of this air film, contact area is seen blue.
Journal ArticleDOI
TL;DR: In this paper, the spectral-angular and angular distributions of parametric X-ray radiation (PXR) and diffracted transition radiation (DTR) are obtained taking into account the multiple scattering of the relativistic electrons by the atoms of the target.
Abstract: The dynamic theory of coherent X-ray radiation, excited in a periodic layered medium by a divergent beam of relativistic electrons in the Bragg scattering geometry, is developed. In framework of the two-wave approximation of the dynamic theory of diffraction, expressions describing the spectral-angular and angular distributions of parametric X-ray radiation (PXR) and diffracted transition radiation (DTR) are obtained taking into account the multiple scattering of the relativistic electrons by the atoms of the target. Based on the expressions obtained, the possibilities of the manifestation of the effects of dynamical diffraction in coherent X-rays were investigated. The influence of the asymmetry of the electron Coulomb field reflection with respect to the target surface (the reflecting layers situate nonparallel to target surface) on the spectral-angular characteristics of the PXR and the DTR under conditions of the electron multiple scattering is estimated. It is shown that at a fixed Bragg angle the width of the PXR spectrum increases when the angle of incidence of the electron on the target decreases, which leads to an increase in the PXR angular density. In the same conditions the width of the frequency domain of total external reflection and the amplitude of the DTR spectrum also increase, which leads to a significant increase in the angular density of the DTR. The obtained analytical expressions can be used to determine the optimal parameters of the experiment on confirmation of the predicted dynamic effects.
01 Jan 2017
TL;DR: In this paper, an analysis of X-ray passage through a single monocapillary under the regime of an one reflection is presented, where a qualitative estimation of the phenomenon observed and computer simulation by a wave theory are given.
Abstract: In the paper an analysis of X-ray passage through a single monocapillary under the regime of an one reflection ispresented. It is shown that a ray approximation does not explain the results obtained experimentally. A qualitative estimation of the phenomenon observed and computer simulation by a wave theory are given.Keywords:X-ray, monocapillary, ray optics, wave optics, capillary optics 1. INTRODUCTION A possibility of X-rays control by the multiple total external reflection into hollow tubes is well-known, however,to use the systems of capillaries packed in a definite order for collecting, controlling and forming X-ray beams wassuggested comparatively recently (a detail analysis was presented in the paper [1]). The recent research results on transmission of X-ray radiation through capillary systems showed that passedradiation distribution behind these systems may present a complex character[2]. Under the specific ratio betweenbeam and system parameters the wave properties may be observed.Studying an X-ray transmission through single monocapillaries discovered that in this case the effects, whichare unusual by the ray optics, are observed[3,4]. In the work presented a theoretical analysis on process of X-ray
Journal ArticleDOI
TL;DR: In this paper, the authors investigated the total reflection of a pulsed light beam at the interface between vacuum and a negative permittivity medium, the electromagnetic fields and the associated energy-flux patterns in the two media are investigated analytically and numerically.
Abstract: For total reflection of a pulsed light beam at the interface between vacuum and a negative permittivity medium, the electromagnetic fields and the associated energy-flux patterns in the two media are investigated analytically and numerically. For a TE (transverse electric) polarized pulsed beam with positive Goos–Hanchen shift, energy reflection occurs not only in the second medium but also in the first medium because of interference between the incident and reflected fields. However, for TM (transverse magnetic) polarization where the Goos–Hanchen shift is negative, reflection of energy flux occurs in the first medium (or in front of the interface). At the same time, the energy flux around the interface forms time-dependent loops which absorb energy from the incoming flux in the front edge of the pulse but release energy into the outgoing flux in the later edge of the pulse to ensure energy conservation. Therefore, the so-called causality paradox in TM polarization is caused by the fact that interference between incident and reflected fields in the first medium and energy-flux loops around the interface offer a shorter path for reflection of energy flux (or photons).

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20224
20214
20206
20198
20189
201710