index of refraction


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index of refraction

[′in‚deks əv ri′frak·shən]
(optics)
The ratio of the phase velocity of light in a vacuum to that in a specified medium. Also known as absolute index of refraction; absolute refractive constant; refractive constant; refractive index.
References in periodicals archive ?
This is because in a Luneburg lens, the index of refraction varies across the spherical lens body, making it very different than a normal lens.
7), originates from the presence of BODIPY dye in the microsphere, and we combined it linearly with the real part of the index of refraction of styrene to yield the total index of refraction of the microsphere.
Her study overcomes two limitations of these materials - too much light is "lost," or absorbed by metals such as silver and gold contained in the metamaterials, and the materials need to be more precisely tuned so that they possess the proper index of refraction.
Secondly, it changes the optical composition of tissue because the glycerol that replaces the water within it has an index of refraction which matches certain tissue components, such as collagen.
Motter points out that as the difference in the index of refraction between the polymer layers increases, fewer layers are needed to attain the necessary level of reflectivity.
Cohen stresses that the invisibility cloak is plasmonic and does not invoke transformational optics or a negative index of refraction.
Prior Information Notice: Delivery "device for measuring the index of refraction and dispersion of materials" by m-line.
Consequently a commercial spectrophotometer with an IS detector could be used to determine microsphere diameter, the concentration of microsphere suspension, and the wavelength dependence of the index of refraction of the microsphere material.
PPG Industries has obtained a patent for a coated substrate comprised of a substrate having an index of refraction; an undercoating comprised of a graded layer comprised of a mixture of at least two materials selected from titania and at least one of tin oxide, silica, and alumina deposited on at least a portion of the substrate, wherein the undercoating consists of inorganic materials; and an outermost functional coating having an index of refraction deposited on at least a portion of the undercoating, wherein the functional coating is a single layer, photocatalytic coating comprised of anatase crystalline titania, and wherein the undercoating is configured such that the coated substrate has a visible reflectance of no greater than 25% as measured from the coated side of the substrate.

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