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Browse Prior Art Database

Slider-Mounted Solid Immersion Lens for Optical Storage

IP.com Disclosure Number: IPCOM000116966D
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Albrecht, TR: AUTHOR [+3]

Abstract

Disclosed is a method for flying a Solid Immersion Lens (SIL) in close proximity to an optical data storage disk. The function of the SIL is to reduce the focused spot size and therefore increase the data storage density.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 90% of the total text.

Slider-Mounted Solid Immersion Lens for Optical Storage

      Disclosed is a method for flying a Solid Immersion Lens (SIL)
in close proximity to an optical data storage disk.  The function of
the SIL is to reduce the focused spot size and therefore increase the
data storage density.

      By focusing light rays through a SIL made from a high index of
refraction (n) material, the focused spot size can be reduced in
diameter by a factor of  n sup 2  over that obtained without the SIL.
The SIL consists of a truncated sphere of height r(1 + 1/n), where r
is the radius of the sphere (1).  When the SIL is incorporated into
an optical data storage device, the potential data density is
increased by a factor of n(4).  The SIL would be placed between a
focusing objective and the media and must be maintained at a distance
of much less than the wavelength of light from the media surface.

      To achieve this close spacing of the SIL to the media, the SIL
would be mounted onto a slider, similar to those used in magnetic
recording.  An air-bearing surface would be patterned onto the bottom
of the slider with the SIL at the point of closest spacing between
the slider and disk.  Several approaches could be taken to
manufacture such a slider, such as gluing the SIL into a hole in the
slider or injection molding the entire assembly.  The air-bearing
surface would be similar to that commonly used in magnetic recording,
such as rails or feet/pads on the slider bottom (*...