Browse Prior Art Database

Use of Aerogel Films in Optical Storage Media

IP.com Disclosure Number: IPCOM000115630D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Garwin, RL: AUTHOR [+4]

Abstract

Disclosed is a thermal super-insulator material for use in optical storage media which can alleviate excessive output power demands on a laser source used to deposit thermal energy via irradiation during data writing and erasure. The material can be deposited in a layer as thin as 100nm in this application. The disclosure solves the prior problems of this technology: o Eliminates unwanted loss of heat energy deposited by a focused laser beam thus making thermally-driven writing more efficient; o Provides the above benefit using a process compatible with the fabrication of disks with thin film storage layers.

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Use of Aerogel Films in Optical Storage Media

      Disclosed is a thermal super-insulator material for use in
optical storage media which can alleviate excessive output power
demands on a laser source used to deposit thermal energy via
irradiation during data writing and erasure.  The material can be
deposited in a layer as thin as 100nm in this application.  The
disclosure solves the prior problems of this technology:
  o  Eliminates unwanted loss of heat energy deposited by a focused
      laser beam thus making thermally-driven writing more efficient;
  o  Provides the above benefit using a process compatible with the
      fabrication of disks with thin film storage layers.

      One places an ultra-low thermal conductivity thin film
(approximately 1000 A  50%) in a conventional quadrilayer film
stack in the dominant heat conduction path (Figure).  The material is
aerogel (1, 2).  Preferably, the aerogel is placed between the D2 and
reflector layers to minimize disturbance of the MO material during
the wet processing of aerogel deposition.  By controlling the
thickness of the aerogel film, one can retain desirable optical
performance of the film stack while enhancing the thermal isolation
of the storage film (MO) from heat sinks, and thereby improve the
thermal efficiency of the structure.  This will reduce the power
requirements on the diode laser for writing and erasing in an optical
disk system.
  Organic coating
  -------------------...