| 摘要 |
A method of increasing recording density and capacity of a compact disc. The compact disc has a transparent substrate and a data-recording region on the transparent substrate. To perform data access, a laser light beam emitting from a light source transmits through the transparent substrate and is incident on the data recording region. By inserting a optical plate with a super-resolution near-field structure between the light source and the compact disc, the light intensity of the laser light beam is increased and the aperture of the laser light beam is reduced. Therefore, the recording dimension of data recording region on the compact disc is reduced, and the recording density and capacity of the compact disc is increased. The super-resolution near-field structure is formed of a first dielectric layer, a second dielectric layer and an active layer sandwiched between the first and second dielectric layers. The material of the active layer is selected from one of gallium, germanium, arsenic, selenium, indium, antimony (stibium), tellurium and silver or gallium oxide, germanium oxide, arsenic oxide, selenium oxide, indium oxide, antimony oxide, tellurium oxide and silver oxide.
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