Non-volatile holographic storage in doubly doped lithium niobate crystals
Reads0
Chats0
TLDR
In this paper, the authors used a large number of lithium niobate crystals with two different deep electron traps (iron and manganese) to construct a red-light interference pattern that can be read in the absence of ultraviolet light.Abstract:
Photorefractive materials are being widely investigated for applications in holographic data storage1. Inhomogeneous illumination of these materials with an optical interference pattern redistributes charge, builds up internal electric fields and so changes the refractive index. Subsequent homogeneous illumination results in light diffraction and reconstructs the information encoded in the original interference pattern. A range of inorganic and organic photorefractive materials are known2, in which thousands of holograms of high fidelity can be efficiently stored, reconstructed and erased. But there remains a problem with volatility: the read-out process usually erases the stored information and amplifies the scattered light. Several techniques for ‘fixing’ holograms have been developed3,4,5,6, but they have practical disadvantages and only laboratory demonstrators have been built7,8,9,10. Here we describe a resolution to the problem of volatility that should lead to the realization of a more practical system. We use crystals of lithium niobate — available both in large size and with excellent homogeneity — that have been doped with two different deep electron traps (iron and manganese). Illumination of the crystals with incoherent ultraviolet light during the recording process permits the storage of data (a red-light interference pattern) that can be subsequently read, in the absence of ultraviolet light, without erasure. Our crystals show up to 32 per cent diffraction efficiency, rapid optical erasure of the stored data is possible using ultraviolet light, and light scattering is effectively prevented.read more
Citations
More filters
Journal ArticleDOI
Three-dimensional optical holography using a plasmonic metasurface
Lingling Huang,Lingling Huang,Xianzhong Chen,Holger Mühlenbernd,Hao Zhang,Shumei Chen,Shumei Chen,Benfeng Bai,Qiaofeng Tan,Guofan Jin,Kok Wai Cheah,Cheng-Wei Qiu,Jensen Li,Thomas Zentgraf,Shuang Zhang +14 more
TL;DR: Huang et al. as mentioned in this paper developed ultrathin plasmonic metasurfaces to provide 3D optical holographic image reconstruction in the visible and near-infrared regions for circularly polarized light.
Journal ArticleDOI
Holographic data storage
J. Ashley,M.-P. Bernal,Geoffrey W. Burr,Hans J. Coufal,H. Guenther,John A. Hoffnagle,C. M. Jefferson,Brian Marcus,Roger M. Macfarlane,Robert M. Shelby,G. T. Sincerbox +10 more
TL;DR: An overview of the research effort on volume holographic digital data storage is presented, highlighting new insights gained in the design and operation of working storage platforms, novel optical components and techniques, data coding and signal processing algorithms, systems tradeoffs, materials testing and tradeoff, and photon-gated storage materials.
Journal ArticleDOI
High-Efficiency Broadband Meta-Hologram with Polarization-Controlled Dual Images
Wei Ting Chen,Kuang-Yu Yang,Chih Ming Wang,Yao-Wei Huang,Greg Sun,I-Da Chiang,Chun Yen Liao,Wei-Lun Hsu,Hao Tsun Lin,Shulin Sun,Lei Zhou,Ai Qun Liu,Din Ping Tsai,Din Ping Tsai +13 more
TL;DR: The flexibility demonstrated here for the meta-hologram paves the road to a wide range of applications related to holographic images at arbitrary electromagnetic wave region.
Journal ArticleDOI
Holographic data storage
Demetri Psaltis,Geoffrey W. Burr +1 more
TL;DR: Developments in holographic 3D memories are described, in which high density is achieved by superimposing many holograms within the same volume of recording material.
Journal ArticleDOI
Holographic Data Storage Systems
TL;DR: Fundamental issues underlying holographic data storage: grating formation, recording and readout of thick and thin holograms, multiplexing techniques, signal-to-noise ratio considerations, and read out techniques suitable for conventional, phase conjugate, and associative search data retrieval are discussed.
References
More filters
Journal ArticleDOI
Methods of Digital Video Microscopy for Colloidal Studies
John C. Crocker,David G. Grier +1 more
TL;DR: In this article, a set of image processing algorithms for extracting quantitative data from digitized video microscope images of colloidal suspensions is described, which can locate submicrometer spheres to within 10 nm in the focal plane and 150 nm in depth.
Journal ArticleDOI
Theory of the stability of strongly charged lyophobic sols and of the adhesion of strongly charged particles in solutions of electrolytes
B.V. Derjaguin,L Landau +1 more
Journal ArticleDOI
A photorefractive polymer with high optical gain and diffraction efficiency near 100
TL;DR: In this article, the authors describe a polymer composite with excellent photorefractive properties, achieving a diffraction efficiency approaching 100% and a net two-beam coupling gain of more than 200 cm-1.
Journal ArticleDOI
Like-charge attractions in metastable colloidal crystallites
TL;DR: In contrast to most conventional solids, colloidal crystals can be forced into metastable superheated states as discussed by the authors, and the structure and dynamics of these metastable crystals show evidence for strong long-range attractions between similarly charged spheres.
Journal ArticleDOI
Microscopic measurement of the pair interaction potential of charge-stabilized colloid.
John C. Crocker,David G. Grier +1 more
TL;DR: The measured spatial dependence of the potential is consistent with the screened Coulomb repulsion expected from the Derjaguin-Landau-Verwey-Overbeek theory of colloidal interactions.