By Junji Tominaga, Takashi Nakano
Optical disc is without doubt one of the winning companies on the planet, and large quantities of discs and drives were unfold world wide. greater than a thousand million discs are produced and disbursed each year. because the ?rst optical discs – Laser Discs and Compact Discs (CD) – have been shipped within the early Nineteen Eighties, they've got swiftly ruled the area track industry, and DVDs will exchange the video-tape marketplace within the close to destiny. The optical disc and force applied sciences encompass the main complex and built-in structures with reference to optics, physics, chemistry, arithmetic, electronics, mechanics and similar topics; a big variety of scientists and engineers have engaged within the learn and improvement of the platforms. one of many key elements of the advance of the optical disc platforms, after all, leads to the provision of inexpensive, reliable, and trustworthy semiconductor laser devices. Now, you could shop info as much as four. 7GB on a unmarried facet of the 12-cm DVD, and within the close to destiny, blue laser expertise will let garage of greater than 20GB at the similar dimension disc. we must always no longer even though fail to remember the opposite center applied sciences similar to focusing the beam at the floor of a spinning disc accurately, and encoding and interpreting electronic info. the information ability of optical discs has elevated from zero. 65GB to 25GB by way of the 12 months 2003, and we definitely think it's going to proceed to extend with new applied sciences.
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Additional resources for Optical Near-Field Recording: Science and Technology
4. Fourier simulation of two screen problems. Hence, the ﬁrst screen has two slits and the distance is taken to the ratio of 4:1 (aperture). The slit size of the second screen is 1/5 of that of the ﬁrst screen’s aperture 46 3 Basic Theory of Optical Near-Field and Surface Plasmon Polaritons Fig. 5. Fourier simulation with a diﬀerent aperture size. 1 Basic Theory of Optical Near-Field, Surface, and Local Plasmons 47 Fig. 6. Fourier simulation with the slit duty ratio of 1:1. Hence, the slit size of the second screen is the same as that of the ﬁrst screen plasmons .
1) Hence, the second screen position is taken as z = 0, and the two slit distance and the hole diameter are l and d, respectively. E0 is the incident electromagnetic ﬁeld. 2) In far-ﬁeld optics and normal optical microscope system, Z is far longer than the light wavelength used and one may think about the integration range between −ω/c and +ω/c because the term exp[−i(k 2 − kx2 )1/2 Z] beyond the range becomes real and is rapidly eliminated; the optical near-ﬁeld is thus the contribution from the outer integrated region.
Grooves are cut on the disc surface for the laser beam guiding for recording and readout, instead of using pre-mastered pits in a CD. The groove depth of a CD-R is much deeper than that of a CD-RW because the refractive indices of the organic dyes are relatively smaller than that of metal or metal alloys (phase-change materials) used in a CD-RW. The depth is approximately 80 nm to 120 nm in a CD-R. 6 µm. The fabrication method of the substrate discs is the same as that of a CD, and the dye ﬁlm is spin-coated.