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Improved Discontinuous Metal Films for Optical Storage

IP.com Disclosure Number: IPCOM000045961D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Jipson, VB: AUTHOR [+3]

Abstract

Thin discontinuous films of metallic particles carried in a transparentbinder provide an optical storage medium.

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Improved Discontinuous Metal Films for Optical Storage

Thin discontinuous films of metallic particles carried in a transparentbinder provide an optical storage medium.

Use can be made of both single layers and trilayers. In the single layer case the efficiency of the writing process is limited by the fact that about only 20% of the incident light is absorbed. This was a direct result of the fact that it was necessary to use very thin (325 ~) gold layers in order to insure film discontinuity. One can greatly improve the properties of these films by depositing the active layer (Au described here) onto a tilted substrate, as illustrated in Figs. l and 2. In Fig. 2, the substrate is tilted by angle P. This greatly increases the adatom velocity parallel to the substrate surface, which in turn increases the distance between nucleation sites. This allows for thicker films to be deposited while maintaining discontinuity. The table below gives a summary of the optical properties of various gold films. The properties of the films deposited at an angle show a marked improvement in optical properties (higher reflectivity and absorption) when compared to a normally deposited film. All the films in this table are discontinuous.

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A comparison of the laser writing characteristics of the first two films in the table is shown in Fig. 3 along with similar results for a 250 ~ continuous tellurium film. In all cases PMMA substrates were used. Note the large increased W...