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Step-index profile
About: Step-index profile is a research topic. Over the lifetime, 3104 publications have been published within this topic receiving 53199 citations.
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Patent•
19 Apr 1971TL;DR: In this article, the authors present a model of a trans-parent matrix consisting of a shape-meric matrix with an ORGANIC DILUENT THEREWITHIN, the DilUENT forming a Continuous Grader.
Abstract: IN REFRACTIVE INDEX EXTENDING IN A DIRECTION SUBSTANTIALLY PERPENDICULAR TO THE OPTICAL AXIS OF THE ELEMENT. THE ELEMENT HAS LENS-LIKE PROPERTIES. THE INVENTION RELATES TO A TRANSPARENT ELEMENT FOR THE DEFLECTION OF INCIDENT ELECTROMAGNETIC RADIATION HAVING AN OPTICAL AXIS EXTENDING THERETHROUGH. THE ELEMENT INCLUDES A SHAPED POLYMERIC MATRIX HAVING AN ORGANIC DILUENT THEREWITHIN, THE DILUENT FORMING A CONTINUOUS GRADIENT
57 citations
TL;DR: In this article, the environmental sensing behavior of long period gratings written in three fibers with different refractive index profiles: step, W and a progressive three layered fiber was compared and significant differences in the behaviour of the three fiber types were found.
56 citations
Patent•
28 Sep 2000
TL;DR: In this article, the antireflection film and polarizing plate are produced by laminating high refractive index layers which contain 5 to 65 vol.% of inorganic fine particles having 1 to 200 nm average particle diameter and having a core/shell structure and 35 to 95 vol.
Abstract: PROBLEM TO BE SOLVED: To obtain an antireflection film and a polarizing plate suitable for mass production and having a high refractive index layer which has an extremely high refractive index and which is excellent in transparency, physical strength (wear resistance or the like) and weather resistance (light resistance and wet heat resistance), and to provide an image display device in which reflection is prevented by a proper means using the aforementioned plate. SOLUTION: The antireflection film and polarizing plate are produced by laminating high refractive index layers which contains 5 to 65 vol.% of inorganic fine particles having 1 to 200 nm average particle diameter and having a core/ shell structure and 35 to 95 vol.% of an organic compound polymer and which has 1.65 to 2.40 refractive index, and low refractive index layers having 1.30 to 1.55 refractive index. The polarizing plate is used for the image display device.
56 citations
TL;DR: In this article, the effect of a thin overlay of higher refractive index than that of the cladding of a long-period fiber grating on the transmission spectrum was studied.
Abstract: A thin overlay of higher refractive index than that of the cladding of a long-period fiber grating induces in cladding modes strong variations in effective index, mode profile, cross-coupling coefficient with the core mode, and self-coupling coefficient. Some conditions must be met in order to obtain the highest inducement. The key parameters are the thickness and the refractive index of the overlay, and the ambient refractive index. Under optimum conditions, the sensitivity of the device to variations in any of the critical parameters is improved in a great manner. The result is large shifts of the attenuation bands in the transmission spectrum. If the refractive index of the overlay is complex, there is an additional phenomenon of vanishing of the attenuation bands in the transmission spectrum. This occurs for specific thickness values of the overlay. The problem is solved in two steps: a vectorial analysis of the modes and the application of coupled-mode theory.
56 citations
TL;DR: In this paper, a quantative explanation of the borosilicate refractive index behavior has been proposed based on the Sellmeier dispersion model and a molar refractivity analysis.
Abstract: A recent investigation of the binary borosilicate glass system has led to the realization of a useful cladding material for pure fused silica core fiber optical waveguides. The feature which makes the borosilicate glass useful is that its index of refraction is sufficiently less than that of pure fused silica to allow light guidance in silica core‐borosilicate clad fibers. The previous work offered no explanation for the observed but unexpected behavior of the borosilicate refractive index. Continued studies of this glass system have now led to a quantative explanation of the refractive index behavior. Two theoretical approaches are discussed. One is based on the Sellmeier dispersion model and the other on a molar refractivity analysis. The main quantities of interest turn out to be density, composition, structure, and ionicity. An important prediction based on this work is that properly quenched borosilicate glass can have a refractive index even lower than previously observed. This prediction was subseq...
56 citations