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MultiMonomoleculear Film Materials for Acoustic & Optical Devices

IP.com Disclosure Number: IPCOM000074888D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 3 page(s) / 49K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR [+2]

Abstract

This description is directed to materials for use in the fabrication of durable unimolecular organic films. More particularly, it relates to the fabrication of multilayer films of controlled thickness and contour, and which can be used in a wide range of optical and acoustic guided wave devices.

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MultiMonomoleculear Film Materials for Acoustic & Optical Devices

This description is directed to materials for use in the fabrication of durable unimolecular organic films. More particularly, it relates to the fabrication of multilayer films of controlled thickness and contour, and which can be used in a wide range of optical and acoustic guided wave devices.

The forming of unimolecular layers of organic materials has been described in the publication "Monomolecular Layers & Light", Karl H. Drexhage, Scientific American, March 1970, pp.108-119.

In making this device, there are employed materials such as shown in Fig. A. These materials are suitable for deposition in a manner similar to that described in the above-mentioned publication and, in addition, have the important advantage of being polymerizable. Thus, they adhere to the substrate and to each other quite strongly, thereby giving rise to a much more durable and permanent structure. The polymerization can be achieved without changes in the film or successive layers. Polymerization is induced by irradiation with ultraviolet light or with an electron beam. In this connection, styrenes and acrylates are known to undergo polymerization. Cinnamates undergo dimerization. Sensitizers or initiators may be incorporated. However, this is not essential. Figs. B and C illustrate monomeric and polymerized films, respectively.

A structure incorporating these materials is shown in Fig. D. The structure comprises a suitable substrate 10, having thereon an optical or acoustic wave- guide device 12 comprising layers 14 of the above materials. Each layer is on the order of 50 angstroms thick and has different acoustic or optical properties. Gratings are used to transfer energy vertically. The layers give rise to the desired dispersive characteristics and may contain nonlinear dopants such as dye-molecules. Discontinuities in the layers are employed to match impedances. Metallic layers can be interspersed among the other layers or at the top and bottom. The latter structure would gi...