Three-dimensional optical disk data storage via the localized alteration of a format hologram

Abstract

Three-dimensional optical data storage is demonstrated in an initially homogenous volume by first recording a reflection grating in a holographic photopolymer. This causes the entire volume to be weakly reflecting to a confocal read/write head. Superposition of two or three such gratings with slightly different k-vectors creates a track and layer structure that specialized servo detection optics can use to lock the focus to these deeply-buried tracks. Writing is accomplished by locally modifying the reflectivity of the preexisting hologram. This modification can take the form of ablation, inelastic deformation via heating at the focus, or erasure via linear or two-photon continued polymerization in the previously unexposed fringes of the hologram. Storage by each method is demonstrated with up to eight data layers separated by as little as 12 microns.

Ultrahigh density data storage based on organic materials with SPM techniques

“…For the optical technique aspects, the main goals are to overcome the diffraction limit of 2D storage by near-field recording and to take advantage of volumetric storage by adding the third dimension, such as two-photon absorption storage and holographic data storage. 13,14 At present, besides magnetic storage and optical storage, the application of SPM technology (including scanning tunnelling microscopy (STM), 15,16 atom force microscopy (AFM), 17 scanning near-field microscopy (SNOM), 18 etc.) to realize ultrahigh density data storage has become an attractive research field.…”

The Mechanism of Downregulated Interstitial Fluid Drainage Following Neuronal Excitation

“…Because the ISF drains in a compartmentalized ECS system, the sensory-dependent neurotransmitters stay and act in the specific ECS division for approximately 2 h. During this stay, the produced lactic acid by glutamate astrocytic glycolysis has been verified to be associated with the formation of long-term memory [5,54,55]. The aforementioned local procedures are very similar to disk writing and recording in computer storage [56]. The recorded information might be copied, or mirror stored in the hippocampus by its physical connections with the thalamus [57,58].…”

A Review of the Optimisation of Photopolymer Materials for Holographic Data Storage

“…McLeod et al [64] demonstrated a three-dimensional optical data storage system in an initially homogenous volume by first recording a reflection grating in a holographic photopolymer. The volume data storage method used a single read/write head locked, in radius and depth, to a prefabricated volume servopattern.…”