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Optical Storage and Recording Using Surface Polaritons on Grating Structure

IP.com Disclosure Number: IPCOM000051838D
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 20K

Publishing Venue

IBM

Related People

Philpott, MR: AUTHOR [+2]

Abstract

An optical storage and recording system using surface polaritons has a prism free structure in which the surface of the surface active medium is molded in the shape of a periodic grating. As shown in the drawing, the system 10 includes a periodic grating 12 of a surface active material, such as Cu, Ag, Au or Al, that is coated with the optical storage or recording medium 14. Medium 16 is the substrate or a second optical storage or recording medium that can be accessed from below. Alternatively a composite structure addressable from both sides consists of two systems 10 joined back to back via substrates 16.

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Optical Storage and Recording Using Surface Polaritons on Grating Structure

An optical storage and recording system using surface polaritons has a prism free structure in which the surface of the surface active medium is molded in the shape of a periodic grating. As shown in the drawing, the system 10 includes a periodic grating 12 of a surface active material, such as Cu, Ag, Au or Al, that is coated with the optical storage or recording medium 14. Medium 16 is the substrate or a second optical storage or recording medium that can be accessed from below. Alternatively a composite structure addressable from both sides consists of two systems 10 joined back to back via substrates 16.

The light beam 18 excites the surface waves on the grating 12 where the grating 12 itself supplies the mismatch in momentum. The grating 12 may be generated by conventional ruling techniques and replicated into the appropriate material by pressing, or it may be generated holographically via the interference of two beams of light in either a thermoplastic or photoresist to give the desired structure which can also be replicated by pressing.

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