Nondestructive readout of a three-dimensional photochromic optical memory with a near-infrared differential phase-contrast microscope

Toriumi, A.; Herrmann, Juergen M.; Kawata, Seiichi

doi:10.1364/ol.22.000555

Cited by 85 publications

(38 citation statements)

References 10 publications

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“…Therefore, a polymeric material is preferred due to its advantages in 3-D erasable storage memory [31][32][33] and the photochromism of complex 1 was investigated in PMMA films.…”

Section: Photochromism Of Complex 1 In Pmma Filmmentioning

confidence: 99%

A photochromic AgBF 4 complex with cis -1,2-dicyano-1,2-bis(2′,4′,5′-trimethyl-3′-thienyl)ethene: Synthesis, structure and photochromism

Han

et al. 2017

Inorganica Chimica Acta

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“…Therefore, a polymeric material is preferred due to its advantages in 3-D erasable storage memory [31][32][33] and the photochromism of complex 1 was investigated in PMMA films.…”

Section: Photochromism Of Complex 1 In Pmma Filmmentioning

confidence: 99%

A photochromic AgBF 4 complex with cis -1,2-dicyano-1,2-bis(2′,4′,5′-trimethyl-3′-thienyl)ethene: Synthesis, structure and photochromism

Han

et al. 2017

Inorganica Chimica Acta

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“…[10][11][12][13] Nishikubo et al [14][15][16][17] reported that polymers containing certain norbornadiene (NBD) moieties in the main and side chains showed high photochemical reactivity, and had a high photo-energy storage capability. NBD is converted to quadricyclane (QC) under UV irradiation, and the resulting polymers are expected to be good photo-energy transformation systems.…”

Section: Calixarene Derivatives As Refractive-index-changing Materialsmentioning

confidence: 99%

Development of Novel Photo-Functional Materials Based on Cyclic Oligomers

Kudo

Nishikubo

2009

Polym. J.

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Novel photo-functional materials, such as refractive-index-changing materials, argon fluoride (ArF) resist materials, and electron beam (EB) resist materials, were designed based on the structures of calixarenes, cyclodextrin, and noria. The synthesis and refractive-index properties of calixarene derivatives containing photo-reactive groups, including azobenzene, norbornadiene, anthracene, cinnamate, and chalcone, were examined, and refractive-index changes (Án D 's) of between 0.007 and 0.061 were observed. The synthesis and patterning properties of a single-layer ArF photoresist system of -CD derivative containing t-butyl ester and fluorine were examined, and a well-resolved 100 nm line and space pattern was obtained on a silicon wafer. A new ladder-like macrocycle, noria (water wheel in Latin), was also synthesized and its application as an EB resist material was examined. The noria derivatives noria-COO t Bu containing t-butyl ester groups, noria-BOC containing t-butyloxycarbonyl group, and noria-acetal containing acetal groups had good physical properties and photo-reactivity. EBresist based on noria-COO t Bu and noria-BOC provided clear line and space patterns at a resolution of 70 and 50 nm, respectively.The development of novel photo-functional materials has contributed substantially to progress in the electronic and optoelectronic industries. Photo-reactive groups, such as radical-or cation-polymerizable groups, photo-isomerizable groups, and photo-removable groups, are useful for obtaining ultraviolet (UV)-cured resins, refractive-index-changing materials, and photo-resist materials, respectively. The physical properties of photo-functional materials, such as film-forming characteristics, thermal stability, mechanical properties, and photo-reactivity, depend primarily on the polymer or oligomer structure. Generally, the photochemical reactivity increases with decreasing glass transition temperature (T g ), due to increase of the molecular motion of polymer chains and functional groups.The photo-chemical reactivity of oligomers is usually greater than that of polymers, due to the lower T g of oligomers compared with polymers. However, the mechanical properties, thermal stability and film-forming properties of oligomer derivatives are inferior to those of polymer derivatives. However, if a linear oligomer is changed to a cyclic oligomer by coupling reaction of the two ends, the physical properties of the resulting cyclic oligomer are expected to be superior to those of the linear oligomer. Therefore, we considered that photofunctional cyclic oligomers might combine the advantages of photo-functional polymers and photo-functional oligomers. That is, photo-functional cyclic oligomers might have both high photo-chemical reactivity and good physical properties.Calixarenes are typical cyclic oligomers containing many hydroxyl groups, and are prepared easily by the reaction of phenols with aldehydes (Scheme 1). 1Although it is well known that calixarenes are attractive materials for use as host molecules in th...

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“…Photoisomerization is a reversible one and is applicable to write-readerase (WRE) recordings and switching devices. [1][2][3][4][5][6][7] Typical compounds used for photoisomerization are azobenzene, spirobenzopyran, and diarylethene derivatives. Photopolymerization, photolocking, and photoelimination are irreversible reactions, and can be used for readonly holographic memories, waveguide lithography, microlenses, and other optical elements.…”

Section: Introductionmentioning

confidence: 99%

Large Photoinduced Refractive Index Changes of Transparent Polymer Films Containing Photoeliminable Diazo and Azido Groups

Murase

Horie

1999

Macromolecules

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We measured photoinduced refractive index changes of polymer films containing various compounds, such as R-diazoketone derivatives, azide derivatives, and others which induce the loss of nitrogen molecules during photoirradiation. PMMA films containing 20 wt % of 2-diazo-1-indanone (2DI) and -azidostyrene ( -AS) showed large refractive index changes of 0.015 during photolysis, keeping transparency throughout the entire visible region. The fact that the chemical structure of the substituents at R-position of the diazo group and hence the resonance effect do not affect the photoinduced changes in refractive indices much indicates the major contribution of the elimination effect of nitrogen molecules to the refractive index changes. Azide derivatives except for -AS showed small refractive index changes which may be related to the chemical structure of the photoproducts. Discussion is given on the estimation of the molar refraction and the contribution of the changes in electronic structure and in density to the refractive index of the systems.

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Nondestructive readout of a three-dimensional photochromic optical memory with a near-infrared differential phase-contrast microscope

Cited by 85 publications

References 10 publications

A photochromic AgBF 4 complex with cis -1,2-dicyano-1,2-bis(2′,4′,5′-trimethyl-3′-thienyl)ethene: Synthesis, structure and photochromism

A photochromic AgBF 4 complex with cis -1,2-dicyano-1,2-bis(2′,4′,5′-trimethyl-3′-thienyl)ethene: Synthesis, structure and photochromism

Development of Novel Photo-Functional Materials Based on Cyclic Oligomers

Large Photoinduced Refractive Index Changes of Transparent Polymer Films Containing Photoeliminable Diazo and Azido Groups

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