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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•
22 Aug 2013TL;DR: An optical fiber has a core made of silica glass in which a rare earth element and aluminum have been added; an inner cladding layer that is formed around the core, is made of Silica glass, in which at least any one of an alkali metal and an alkaline earth metal has been added, and has a refractive index lower than a refraction index of the core; and an outer claddings layer that has a lower refraction than the inner layer.
Abstract: An optical fiber has: a core made of silica glass in which a rare earth element and aluminum have been added; an inner cladding layer that is formed around the core, is made of silica glass in which at least any one of an alkali metal and an alkali earth metal has been added, and has a refractive index lower than a refractive index of the core; and an outer cladding layer that is formed around the inner cladding layer and has a refractive index lower than the refractive index of the inner cladding layer.
14 citations
Patent•
13 Dec 1989
TL;DR: In this paper, a high light-transmissive dust proof body equipped with a holding frame to be mounted on a mask substrate and a transparent light transmissive film mounted on the holding frame is presented.
Abstract: A high light-transmissive dust proof body equipped with a holding frame to be mounted on a mask substrate and a transparent light-transmissive film mounted on the holding frame, wherein the light-transmissive film comprises an inorganic film having a thickness of 0.2 µm to less than 10 µm and transmitting light having wavelengths of 240 to 500 nm at an average light transmittance of at least 85%, wherein the light-transmissive film forms (i) a three-layer structure of a low refractive index layer/high refractive index layer/base layer, or (ii) a five-layer structure comprising a low refractive index layer/high refractive index layer/base layer/high refractive index layer/low refractive index layer, the high refractive index layer being an inorganic layer and the low refractive index layer being an organic polymer.
14 citations
TL;DR: In this article, a method for measuring the absolute refractive index dispersion of liquids using an array of photonic crystal resonant reflectors of varying periods is presented, which can perform measurements at arbitrary number of wavelengths and requires only a minute sample volume.
Abstract: Refractive index sensing plays a key role in various environmental and biological sensing applications. Here, a method is presented for measuring the absolute refractive index dispersion of liquids using an array of photonic crystal resonant reflectors of varying periods. It is shown that by covering the array with a sample liquid and measuring the resonance wavelength associated with transverse electric polarized quasi guided modes as a function of period, the refractive index dispersion of the liquid can be accurately obtained using an analytical expression. This method is compact, can perform measurements at arbitrary number of wavelengths, and requires only a minute sample volume. The ability to sense a material's dispersion profile offers an added dimension of information that may be of benefit to optofluidic lab-on-a-chip applications.
14 citations
TL;DR: In this paper, an analytical study on the role of intensity profile of writing UV beam on fringe intensity distribution and its effect on the refractive index modulation of fiber Bragg gratings (FBGs) written by the phase mask technique is presented.
14 citations
TL;DR: In this article, the refracted near field technique (RNF) was applied to the measurement of the refractive index profiles in multicore fibres (MCF) and the fiber core diameter and the intercore distances have been determined.
Abstract: The refracted near-field technique (RNF) has been applied to the measurement of the refractive index profiles in multicore fibres (MCF). The fibre core diameter and the intercore distances have been determined.
14 citations