Optical disc head including a bowtie grating antenna and slider for optical focusing, and method for making
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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Abstract
A slider system have been developed to aid in the spacing between read/write heads and the storage medium, and a grating antenna amplifier has been developed to improve illumination spot size and polarization characteristics. The grating antenna can be attached to a grayscale slider to obtain a distance between the illumination spot and antenna that lies in the near field region.
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Citations
23 Claims
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1. An illumination spot formation system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of forming an illumination spot comprising:
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positioning first and second gratings, where the first and second gratings are separated a predetermined distance, where said first and second gratings comprise a plurality of grating elements; and illuminating the first and second gratings with an incident radiation having a characteristic wavelength greater than the predetermined distance, where the first and second gratings, upon illumination, re-radiate forming a spot of desired size and polarization on a provided target medium. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A read and write optical system comprising:
- an amplifying antenna 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 are separated a distance smaller than the characteristic wavelength, and where the amplifying antenna re-radiates the radiation forming a spot size of a desired size and polarization on a target medium; and a moveable delivery system, wherein said delivery system comprises;
a lens structure, where the lens structure contains an integrated portion that condenses and focuses an incident illumination, where the condensed and focused incident illumination becomes the incident radiation illuminating said first and second gratings, and where the orientation of said first and second gratings are maintained with respect to the lens structure; and
a read and write circuit where the read and write circuit sets the polarization of the target medium in the spot, and reads the polarization in the target medium in a predetermined region. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
- an amplifying antenna comprising;
Specification