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Refractive Index Image Recording

IP.com Disclosure Number: IPCOM000053170D
Original Publication Date: 1981-Sep-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Grant, BD: AUTHOR [+2]

Abstract

Various materials schemes have been described to date that result in photochemically induced index of refraction changes. They include photochromic systems, photodimerizations and photopolymerizations, all of which result in relatively small index of refraction changes (delta n~/=.01), but require no solvent processing. The highest efficiency materials (delta n=0.1) are dichromated gelatin and bleached silver halide films, but these each require wet processing steps that are both inconvenient and can result in dimensional changes of the exposed image.

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Refractive Index Image Recording

Various materials schemes have been described to date that result in photochemically induced index of refraction changes. They include photochromic systems, photodimerizations and photopolymerizations, all of which result in relatively small index of refraction changes (delta n~/=.01), but require no solvent processing. The highest efficiency materials (delta n=0.1) are dichromated gelatin and bleached silver halide films, but these each require wet processing steps that are both inconvenient and can result in dimensional changes of the exposed image.

We have now found a method of engineering high index of refraction changes in polymer films that exploits the concept of mass transport by evaporation.

The recent literature has described the photochemistry of alkyl geminal diiodides to proceed as shown in equation (1):

We propose exploiting this photoinduced production of I(2), a volatile product, to engineer index of refraction changes in polymer films. Halogen-containing organic compounds are known to possess large indices of refraction relative to hydrocarbon compounds. Representative data for a series of methane derivatives is given below. This data and the photochemistry shown in equation
(1) suggest the following as excellent organic refractive-index image recording systems: 1) a photostable aliphatic polymer matrix doped with an alkyl geminal diiodide, and 2) a polymer composed of an aliphatic unit and a geminal diiodide unit...