By Gan Fuxi, Wang Yang
In the massive facts period, info garage is without doubt one of the cores within the entire info chain, inclusive of construction, move, sharing, and at last processing. through the years, the expansion of knowledge quantity has been explosive. this day, a number of garage companies desire thoughts with better density and skill. furthermore, details garage within the significant facts purposes may be eco-friendly, secure, and lengthy existence. The garage density of stories used to be mostly stronger in recent times as a result of the fast improvement of nanotechnology. The minimal characteristic measurement 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, reduce strength intake, and elevated retention time. This publication compiles the state of the art study growth of nanometer-scale information garage. the most subject matters lined contain optical reminiscence, random entry reminiscence, magnetic reminiscence, and hybrid reminiscence. The textual content emphasizes more effective equipment for information garage improvement and functions.
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The resolution of this beam inside the cover layer is calculated and shown in Fig. 14, where Fig. 14a is the electric intensity image and Fig. 14b is the electric intensity profile. This beam has a size of FWHM = 100 nm, which can be used in the reading and writing of a disk with a capacity of 200 GB/layer. 12 Schematic of a near-field recording system using longitudinally polarized light, the air gap between the SIL and disk is 30 nm. 13 Structure of the wave plate used in Fig. 12, it consists of four-fan half-wave plates with their slow axis orientation marked in them.
12, it consists of four-fan half-wave plates with their slow axis orientation marked in them. 14 Light intensity distribution inside the cover layer of the disk, where the intensity is arbitrary value (a) electric intensity image, (b) electric intensity profile. 3 Near-Field Recording Using Optical Antennas To further increase the disk capacity to beyond one terabyte per layer, one needs to use optical antennas to localize light to 60 nm or below. The combination of a SIL lens with an optical antenna would be a good option.
One feature that needs to be aware of is that with each small laser spot is created, the redistribution of light could result in strong side lobes in either perpendicular or parallel to the laser propagation direction, which can cause the elongation or even splitting of the focal spot. The second approach is to modulate the effect of the illumination beams at the close vicinities of the focal region. It has taken over a decade for various techniques that utilize non-linear optical and material responses to break the diffraction limit.