By Gan Fuxi, Wang Yang
In the massive facts period, facts garage is without doubt one of the cores within the complete info chain, consisting of 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 prone want stories with larger density and means. furthermore, info garage within the immense facts functions may be eco-friendly, secure, and lengthy existence. The garage density of stories was once principally more advantageous lately as a result of the swift improvement of nanotechnology. The minimal characteristic dimension of optical, magnetic, and electric stories is already on the nanometer scale. in addition, the interdisciplinary cooperation of nanotechnology can facilitate the advance of knowledge garage expertise to accomplish larger operation pace, decrease strength intake, and elevated retention time. This ebook compiles the state of the art examine growth of nanometer-scale information garage. the most subject matters coated comprise optical reminiscence, random entry reminiscence, magnetic reminiscence, and hybrid reminiscence. The textual content emphasizes more effective equipment for facts garage improvement and purposes.
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Additional info for Data storage at the nanoscale : advances and applications
Generally speaking, in the light far field, the limit size is only the half light wavelength. Therefore, the critical problem is optical diffraction limit: D l/NA, as shown in Fig. 6. For breakping through the diffraction barrier in the light far field, several super-resolution approaches have been proposed . 6 Schematic diagram of diffraction limit in light far field. 81. EUV light can come from the laser-produced plasma (LPP): Tin(Sn) drop irradiated by high power CO2 laser. It is easy to get 22 nm line space by EUV lithography.
12) 0 For n belts binary optics, (n = 1, 2, 3, …), the radius for each belt is rj, ( j = 1, 2, …, n), and rj – 1 < rj < rn = 1, r0 = 0, and the corresponding focusing angle is aj = arcsin (rjNA), thus rj = sin(aj)/NA. By making the transmission coefficient within each belt equal, the transmission function T(q) can be expressed as a function of the belt order and is given as T( j) = (–1) j+1. Thus Eq. 14) and i = √–1 , Erfi(x) is the imaginary error function. 13) describes the field on the optical axis generated by the system using the multi-belt p-phase binary optical element.
C and lq are, respectively, the phase modulation function and the amplitude modulation function. 3) where b0 and g are, respectively, the parameters that governs the amplitude modulation for the Gaussian distribution and the Bessel distribution. 1 shows the effect of a phase and amplitude mask applied on the focal spot of a radially polarized beam. For simplicity, an amplitude and phase mask with only two zones is selected to modulate the focal spot of radially polarized beam. qi is the maximum convergence angle of the inner zone.