By Duanyi Xu
This ebook provides rules and functions to extend the cupboard space from 2-D to 3D or even multi-D, together with grey scale, colour (light with varied wavelength), polarization and coherence of sunshine. those actualize the advancements of density, ability and information move cost for optical information garage. furthermore, the utilized implementation applied sciences to make mass information garage units are defined systematically. a few new mediums, that have linear absorption features for various wavelength and depth to mild with excessive sensitivity, are brought for multi-wavelength and multi-level optical garage. This e-book can function an invaluable reference for researchers, engineers, graduate and undergraduate scholars in fabric technology, details technological know-how and optics.
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This e-book provides ideas and functions to extend the space for storing from 2-D to 3D or even multi-D, together with grey scale, colour (light with various wavelength), polarization and coherence of sunshine. those actualize the advancements of density, potential and information move price for optical facts garage.
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Extra info for Multi-dimensional Optical Storage
There are two types of SIL: Hemispherical SIL–Theoretically capable of increasing the numerical aperture of an optical system by n, the index of refraction of the material of the lens. Weierstrass SIL (superhemispherical SIL or super SIL) the height of the truncated sphere is (1 + 1/N)r, where r is the radius of the spherical surface of the lens. Theoretically capable of increasing the numerical aperture of an optical system is by N2. So the size of the focused spot is proportional to k0/NAeff (here k0 is the working wavelength in vacuum).
5 in this book. In order to miniaturization of the multi-wavelength and multilevel optical storage system, the pick up have to be integration in the ﬁrst. Based on the binary optics, subwavelength grating principles and coupled wave theory to design and develop a micro prototype of multi-wavelength and multilevel pick up, as shown in Fig. 5. 20 1 Introduction Fig. 5 The three wavelength optical pick up of hybrid integration and miniaturization with subwavelength grating, binary optical devices, lasers and photodetctors integration This is a typical multi-wavelength optical pick up with binary optics and MEOMs technology that is utilizing polycarbonate to be the substrate, which optical properties are similar very much each other.
If the material can be decompose at a certain temperature that can be writeable and add this function to conventional CD drive. 3 The Advanced Efforts for Multi-dimension Optical Storage 37 Fig. 20 The construction of M-DISC requires that compatible drives remain available, especially if the data or information want to preserve, even simple ﬁles like family pictures, but hard disk drives, tape, and typical CDs and DVDs won’t hold data for an inﬁnite period of time. They all degrade over time and most writable DVDs can lose data after just a couple of years.