Pre-recording type optical recording medium with surface plasmon super-resolution layer
AssigneeRitek Corporation
InventorsDin Ping Tsai, Chwei-Jin Yeh
Life of this patent
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Abstract
A pre-recording type optical recording medium includes a surface plasmon super-resolution layer. The surface plasmon super-resolution layer is a three-layer structure including a first dielectric layer, a second dielectric layer, and a metal layer sandwiched between said first dielectric layer and said second dielectric layer. The metal layer with a certain thickness performs the surface plasmon effect when a laser beam with a suitable wavelength irradiates thereon. By the design and arrangement of the surface plasmon super-resolution layer, the small size of information-carrying pits in the range of around 100 nm is accessible. As a result, the super-resolution without the limit of the optical diffraction is achieved.
Claims6
A high density pre-recording type optical recording medium comprising:
- a transparent substrate provided with a plurality of pits thereon;
- a first dielectric layer formed on said transparent substrate;
- a metal layer formed on said first dielectric layer;
- a second dielectric layer formed on said metal layer;
- and
- a UV coating layer formed on said second dielectric layer, thereby a surface plasmon is generated in the interface between said second dielectric layer and said metal layer when a laser beam with a wavelength in the range from 300 nm to 800 nm irradiates toward said UV coating layer, and obtains the enhancement effect of the near-field intensity so as to achieve a high resolution for distinguishing said pits.
Dependencies are inferred from the claim text.