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Optical disc head including a bowtie grating antenna and slider for optical focusing, and method for making

  • US 7,177,236 B2
  • Filed: 12/13/2002
  • Issued: 02/13/2007
  • Est. Priority Date: 12/13/2001
  • Status: Expired due to Fees
First Claim
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1. An illumination spot formation system comprising:

  • a first grating; and

    a second grating, wherein said first and second gratings are illuminated by incident radiation having a characteristic wavelength, where said first and second gratings comprise a plurality of grating elements, said first and second grating being separated a distance smaller than the characteristic wavelength, and where a grating antenna formed by said first and second gratings re-radiates the radiation forming a spot size of a desired size and polarization on a target medium.

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