Information record mdeium, information recored method and information replay method

Abstract

The information recording medium accosting to the preferred embodiment of the present invention achieves high-speed, high-density recording. The layer, in which ultra-particles made from an optical absorption metal, dielectric, or recording material are formed into regular arrays, is deposited. Resonant Plasmon excitation and resonance absorption of ultra-particles enable the edges of the recorded marks to be identified clearly and intense absorption to occur only in the given layer depending on the wavelength in the case of the multi-layer medium, achieving high-density, large-capacity recording.

Description

technical field [0001] The present invention relates to an information recording medium, an information recording method, and an information recording device for recording information using light. Background technique [0002] Various principles of recording information by irradiating a recording film with light are known, and among them, the principle of utilizing a change in atomic arrangement due to heat, such as a phase transition of a film material, has the advantage of being able to obtain an information recording medium that can be rewritable many times. For example, as described in Japanese Unexamined Patent Publication No. 2001-344807, the basic structure in the case of these phase-change optical discs consists of a protective layer on a substrate, a recording film such as a GeSbTe group, a protective layer, and a reflective layer. [0003] On the other hand, CD-R and DVD-R are practically used optical discs in which an organic material is used as a recording layer....

AI Technical Summary

Problems solved by technology

[0006] In order to perform ultra-high-density recording on optical disks, photoelectric disks, and thermal disks, there are binary recording or multi-valued recording methods in which the length of the recording mark is finely adjusted. Although this method can increase the density in principle, it cannot In fact, due to various reasons, the start and end of the recording mark are wobbled, and it is difficult to increase the density.

In addition, in order to actually increase the recording density, multi-layering is ideal, but since recording is performed by changing the position of the focal point in a method such as a 2-layer DVD, spherical aberration is likely to occur on a recording medium with more than 3 layers. It is a problem to have a bad influence on the light absorption of the layer on the light incident side

In addition, in multilayer (3-dimensional) recording using 2-photon absorption of a material transparent to recording light, there is a problem that a very large or short-pulse laser is required because the transition probability of 2-photon absorption is low.

In addition, in wavelength multiplex recording using latex balls, there is a problem that the intensity of the reproduced signal varies greatly depending on the wavelength due to the inability to control the distribution of ball sizes.

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