A New Medium for Two-Photon Volumetric Data Recording and Playback

Shipway, Andrew N.; Greenwald, Moshe; Jaber, Nimer; Reisman, Benjamin J.

doi:10.1143/jjap.45.1229

Cited by 14 publications

(15 citation statements)

References 19 publications

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“…A functioning 2PA based 3D optical storage system was reported recently [8]. It offered an interlayer separation of 5 µm and depth of up to 600 µm.…”

Section: Introductionmentioning

confidence: 99%

Theory and computations of two-photon absorbing photochromic chromophores

Masunov

Михайлов

2010

Eur. J. Chem.

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KEYWORDSExponential growth in information technology generates ever increasing amounts of data, making recording density of the storage media crucially important. Two-photon absorption was proposed as a basis for high-density multi-layer technology for optical memory and logic devices. This technology suggests to use polymers, doped with photochromic compounds that undergo a reversible photoinduced isomerization, or photoswitching. In this review we consider recent theoretical works and benchmarking studies of the DFT-based methods, capable to predict two-photon absorption (2PA) and photochemical activity, Next we review the applications of these methods to design a prototype molecule that combines the photonmode recording property of photochromic compounds with large 2PA cross-section. We conclude that a posteriori Tamm-Dancoff approximation to the second order CEO approach in Density Functional Theory is the powerful tool for both quantitative predictions and qualitative understanding of the excited state processes in photophysics and photochemistry. We also emphasize general principles for the rational design of a two-photon operated photoswitch.TDDFT Organic photochemistry Photocyclization Photoinduced reactions Two-photon absorption State-to-state transition dipoles

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“…A functioning 2PA based 3D optical storage system was reported recently [8]. It offered an interlayer separation of 5 µm and depth of up to 600 µm.…”

Section: Introductionmentioning

confidence: 99%

Theory and computations of two-photon absorbing photochromic chromophores

Masunov

Михайлов

2010

Eur. J. Chem.

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“…A functioning 2PA-based 3D optical storage system was reported recently. 11 It offered an interlayer separation of 5 µm and depth of up to 600 µm. However, the diode laser commonly used in DVD (digital video disc) devices was not able to provide sufficient intensity to record information, and a higher-power solid-state laser was used for recording.…”

Section: Introductionmentioning

confidence: 99%

DFT-Based Methods in the Design of Two-Photon Operated Molecular Switches

2009

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Conjugated organic molecules with photochromic properties are being extensively studied as prospective optical switching and data storage materials. Among different photochromic compounds, diarylethenes demonstrate thermal stability, fatigue resistance, and high quantum yield. The mechanism of photoswitching in diarylethenes involves a symmetry-allowed conrotatory electrocyclic reaction, initiated by UV light. Replacement of one UV photon with two near-IR ones would offer a number of practical advantages, including drastic increase in storage capacity via three-dimensional multilayer design. For this purpose we designed a prototype molecule with a two-photon absorbing (2PA) pendant substituent, attached to the photochromic diarylethene moiety. However, this molecule was experimentally shown to have lost the photoswitching properties. We analyze reasons for this loss using quantum chemistry tools. Analysis of the nodal structure of the frontier Kohn-Sham orbitals, allowed us to trace the route of the problem to the lone pair orbital of the 2PA substituent falling within the HOMO-LUMO (highest occupied molecular orbital-lowest unoccupied molecular orbital) gap of the photoreactive diarylethene moiety. We suggest a chemical modification of the 2PA substituent in order to restore the order of the orbitals. Potential energy plots along the reaction coordinate at the M05-2X/6-31G* theory level for the prototype 2PA photochromic molecule before and after the modification confirm the predictive capability of the proposed orbital approach. The Slater transition state method was used to obtain geometries along the reaction pathway by the constrained optimization of excited states, whereas potential energy curves were plotted using the recently proposed (Mikhailov, I. A.; Tafur, S.; Masunov, A. E. Phys. Rev. A 2008, 77 (1), 012510) a posteriori Tamm-Dancoff approximation to the time-dependent density functional theory in second order of the external field. We show that this combination is able to produce accurate potential surfaces for 1B and 2A excited states, as compared to available experimental data and results of high-level multireference wave function theory methods.

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“…It has provided proof-of-concept write-read-erase cycle demonstrations towards rewritable and stable multilevel optical data storage at the nanocrystal level. This approach could overcome many of the hurdles currently facing the implementation of 3D optical data storage, since it allows for high conversion efficiency and low read-out power, with high thermodynamic stability [27]. The results presented in this paper could lay the groundwork for future 2D and 3D data storage demonstrations with terabyte-or higher-level storage capacities exploiting the very unique properties of samarium-doped matlockites.…”

Section: Discussionmentioning

confidence: 88%

Towards rewritable multilevel optical data storage in single nanocrystals

et al. 2018

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Novel approaches for digital data storage are imperative, as storage capacities are drastically being outpaced by the exponential growth in data generation. Optical data storage represents the most promising alternative to traditional magnetic and solid-state data storage. In this paper, a novel and energy efficient approach to optical data storage using rare-earth ion doped inorganic insulators is demonstrated. In particular, the nanocrystalline alkaline earth halide BaFCl:Sm is shown to provide great potential for multilevel optical data storage. Proof-of-concept demonstrations reveal for the first time that these phosphors could be used for rewritable, multilevel optical data storage on the physical dimensions of a single nanocrystal. Multilevel information storage is based on the very efficient and reversible conversion of Sm to Sm ions upon exposure to UV-C light. The stored information is then read-out using confocal optics by employing the photoluminescence of the Sm ions in the nanocrystals, with the signal strength depending on the UV-C fluence used during the write step. The latter serves as the mechanism for multilevel data storage in the individual nanocrystals, as demonstrated in this paper. This data storage platform has the potential to be extended to 2D and 3D memory for storage densities that could potentially approach petabyte/cm levels.

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A New Medium for Two-Photon Volumetric Data Recording and Playback

Cited by 14 publications

References 19 publications

Theory and computations of two-photon absorbing photochromic chromophores

Theory and computations of two-photon absorbing photochromic chromophores

DFT-Based Methods in the Design of Two-Photon Operated Molecular Switches

Towards rewritable multilevel optical data storage in single nanocrystals

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