Abstract A novel read-only super-resolution optical disc structure (substrate/mask layer/dielectric layer) is proposed in this paper. By using a Si thin film as the mask layer, the recording pits with a diameter 380nm and a depth 50nm are read out on the dynamic measuring equipment; the laser wavelength α is 632.8nm and the numerical aperture is 0.40. In the course of reproduction, the laser power is 5mW and the rotation velocity of the disc is 4m·s-1. The optimum thickness of the Si thin film is 18nm and the signal-to-noise ratio is 32dB.
Received: 30 May 2002
Revised: 15 June 2002
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 59832060) and by the State Key Development Programme for Basic Research of China (Grant No 19990330).
Cite this article:
Wei Jin-Song (魏劲松), Ruan Hao (阮昊), Shi Hong-Ren (施宏仁), Gan Fu-Xi (干福熹) Read-out of a read-only super-resolution optical disc with a Si mask 2002 Chinese Physics 11 1073
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
