By Gan Fuxi, Wang Yang
In the massive info period, info garage is likely one of the cores within the complete info chain, along with construction, move, sharing, and at last processing. through the years, the expansion of information quantity has been explosive. this present day, quite a few garage providers want thoughts with greater density and ability. in addition, details garage within the vast facts functions might be eco-friendly, secure, and lengthy existence. The garage density of stories used to be mostly more suitable lately due to the fast improvement of nanotechnology. The minimal function dimension of optical, magnetic, and electric stories is already on the nanometer scale. in addition, the interdisciplinary cooperation of nanotechnology can facilitate the improvement of information garage know-how to accomplish better operation pace, reduce strength intake, and elevated retention time. This publication compiles the state of the art examine development of nanometer-scale info garage. the most themes coated comprise optical reminiscence, random entry reminiscence, magnetic reminiscence, and hybrid reminiscence. The textual content emphasizes simpler equipment for info garage improvement and functions.
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Additional resources for Data Storage at the Nanoscale: Advances and Applications
85, the transmission of the aperture is T(q). The optimization of the binary optics can be done by making the intensity on the optical axis constant within a certain range, because the circular polarized light is rotationally symmetric and Ez is zero on the optical axis, the optimization can be achieved by only look at the Ex field intensity on the optical axis. 12) 0 For n belts binary optics, (n = 1, 2, 3, …), the radius for each belt is rj, (â•›â•›j = 1, 2, …, n), and rjâ•›–â•›1 < rj < rn = 1, r0 = 0, and the corresponding focusing angle is aj = arcsin (rjNA), thus rj = sin(aj)/NA.
Opt. Soc. Am. A, 26, 1882–1888. 15. , (2009). Optical antennas and their potential applications to 10 terabit/in 2 recording, Optical Data Storage Topical Meeting (ODS'09). 16. , and Vienne, G. (2012). Fighting against diffraction, apodizer and near field diffraction structures, Laser Photon. , 6, 354–392. au The data density of bit-by-bit optical recording depends on the smallest mark that a given recording mechanism can generate. Ernst Abbe found in 1873 that light with wavelength, traveling in a medium with refractive index n and converging to a spot with angle q will make a spot with Full width at half maximum (FWHM) d not smaller than d = l/(2nâ•›sinâ•›q).
Cooling or heating rate by common methods (sheet rolling) is only 107°C/s, but by short pulse laser irradiation it can reach 1012–14°C/s. Using ps (10–12 s) or fs (10–15 s) ultra-short laser pulse for irradiation and applying optical delay-system for relaxation behavior measurement and refractivity change as the signal, the following experimental results can be obtained: (1) Phase change with ps laser irradiation: The experimental results show that the phase change process of chalcogenide semiconductors performed in the nanosecond-scale, for example, from crystalline to amorphous and vice versa, takes 60 ns and 2–3 ns, respectively, for Ge2Sb2Te5, as shown in Fig.