Solid immersion lens for near field optical storage

A technology of solid immersion lens and near-field light, which is applied in the directions of information storage, record information storage, optical recording/reproduction, etc., to achieve the effect of increasing tolerance

Inactive Publication Date: 2005-10-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, there is no report on the application of this artificial electromagnetic medium to solid immersion lenses for near-field optical storage.

Method used

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  • Solid immersion lens for near field optical storage
  • Solid immersion lens for near field optical storage
  • Solid immersion lens for near field optical storage

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Embodiment Construction

[0022] The present invention will be described in detail below according to the accompanying drawings.

[0023] Such as figure 2 As shown, the solid immersion lens 11 of the present invention is coated with a negative refraction medium layer 11b on the lower surface of the solid immersion lens 11a. The negative refractive medium layer 11b can be a homogeneous material with a negative refractive index, or an artificial microstructure with a negative equivalent refractive index, such as a photonic crystal.

[0024] image 3 It is a schematic diagram of the near-field optical storage system of the solid immersion lens of the present invention. In the figure, the near-field optical storage system of the solid immersion lens is composed of a laser diode 1, a collimator lens 2, a beam splitter 3, an aperture 4, an objective lens 5, an air gap 7, a disc 8, a detector 10 and a solid immersion lens 11 of the present invention. . Solid immersion lens 11 replaces figure 1 The tradi...

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Abstract

The solid immersion lens for near field optical storage has one negative refraction medium layer coated to the lower surface of traditional solid immersion lens to re-focus laser beam focused onto the lower surface of the solid immersion lens onto the surface of CD. During using, the negative refraction medium layer and the air gap have relative dielectric constant and magnetic permeability matched under the work wavelength, and the air gap is designed in the same thickness as the negative refraction medium layer. In the condition without lowering the signal response in reading data and the resolution in reading / writing data, the present invention increases the distance between the lower surface of the solid immersion lens and the CD to relax the requirement on servo system, mechanical transmission system and record environment.

Description

technical field [0001] The invention relates to the field of optical storage technology and artificial electromagnetic medium, in particular to a solid immersion lens for near-field optical storage. Background technique [0002] Optical storage technology has revolutionized the field of information technology. Optical storage uses photons as information carriers, and it can enter the fields of ultra-high storage density, ultra-fast storage rate, parallel input / output, and high interconnection that electronic carriers cannot enter. At present, various optical disc drives use an optical head containing an objective lens to read or write, and complete focus and track tracking servo control. Since the objective lens is far away from the medium (millimeter level), it is called far-field storage. The improvement of its storage density will eventually be limited by the diffraction resolution limit (0.5λ / NA). Therefore, it is particularly urgent to seek new optical storage principl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G11B7/1387
Inventor 刘柳何赛灵陶淘
Owner ZHEJIANG UNIV
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