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Near field light generating device and heat assisted magnetic recording head with the same

  • US 7,742,368 B2
  • Filed: 07/26/2006
  • Issued: 06/22/2010
  • Est. Priority Date: 10/12/2005
  • Status: Expired due to Fees
First Claim
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1. A near field light generating device comprising:

  • a light source;

    a waveguide core which transmits light emitted from the light source; and

    a solid immersion mirror which generates near field light, comprising;

    an upper transmission surface through which light from the waveguide core is transmitted into the solid immersion mirror;

    a lower reflection surface, opposite the upper transmission surface, which reflects light incident thereon;

    lateral reflection surfaces, facing each other at sides of the solid immersion mirror, which reflect light incident thereon; and

    a lower transmission region disposed at a center of the lower reflection surface;

    wherein light reflected from the lateral reflection surfaces forms a light spot on the lower transmission region,wherein the waveguide core is a flat panel type;

    wherein the solid immersion mirror is a flat panel type;

    wherein the effective refractive index of the solid immersion mirror is greater than the effective refractive index of the waveguide core; and

    wherein the thickness of the solid immersion mirror is greater than the thickness of the waveguide core.

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