Holographic recording by excitation of metastable electronic states in Na 2 [Fe(CN) 5 NO]·2H 2 O: a new photorefractive effect

Imlau, Mirco; Haussühl, S.; Woike, Th.; Schieder, R.; Angelov, V.; Rupp, R. A.; Schwarz, K.

doi:10.1007/s003400050718

Cited by 58 publications

(54 citation statements)

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“…2-containing compounds, [6][7][8]14] , by analyzing the macroscopic photorefractive properties with respect to the microscopic changes in the metal-nitrosyl bonding, we obtain an exciting result: Photorefraction is a general property of the light-induced linkage isomers in [ML 5 NO] m± compounds containing a nitrosyl ligand, independent of the metals M, the ligands L, or the charge m of the complex. The implications of this conclusion are far reaching.…”

Section: No]mentioning

confidence: 96%

“…Furthermore we would like to point out that-although holographic light scattering is present in SNP, too-the huge refractive index amplitude up to Dn ∼ 10 -2 still enables an excellent signal-to-noise ratio for these nitrosyl compounds, qualifying them as suitable candidate materials for applications. [7] Experimental Crystals of [Ru(NH 3 ) 5 NO]Cl 3 · H 2 O (space group Pnma) were grown from aqueous solution by slow cooling. A seed crystal was used and the temperature lowered from 70°C to 30°C with 1 K h -1 , typically.…”

Section: No]mentioning

confidence: 99%

“…[15] Therefore, the entire process of pump-beam diffraction at photoinduced refractive index modulations is known as holographic light scattering. The initially weak scattered intensity is amplified up to a saturation value via beam-coupling processes or, as shown for SNP, [7] via the nonlinear photorefractive response. As in any other diffraction process, the diffraction at the recorded volume grating n i (r) obeys Bragg's law.…”

mentioning

confidence: 97%

“…Here an optical bistability is at the origin of photorefraction and the kinetics show a characteristic transient behavior. [5] The unique properties of this class were com- [6][7][8] where light irradiation induces a rotation of the NO ligand by 180°in the [Fe(CN) 5 NO] 2-complexes, [9] as illustrated in y. [10][11][12][13] In all these compounds light-induced linkage isomers of the NO ligand can be accessed by a metal-to-NO chargetransfer transition.…”

mentioning

confidence: 98%

“…Summarizing the experimental part, our results show that photorefraction appeared in the two compounds [Ru(NH 3 ) 5 -NO]Cl 3 · H 2 O and K 2 [Ru(NO 2 ) 4 (OH)NO], and that it was strictly related to photoinduced linkage isomers in analogy to the photorefractive response in SNP, that is, the light-induced linkage isomers are the cause of the photorefraction. [7] Consequently the photorefractive response is local, that is, the refractive index modulation is in phase with the light intensity pattern, and huge refractive index modulations can be expected, for example, Dn = 2 × 10 -2 in SNP.…”

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confidence: 99%

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Photoinduced Nitrosyl Linkage Isomers Uncover a Variety of Unconventional Photorefractive Media

et al. 2007

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The ongoing search for new photorefractive materials offering a high photosensitive flexibility is triggered by the limited tuning ability of conventional photorefractive materials, such as electro-optic crystals, photopolymers, or liquid crystals. One of the latest discovered photorefractive materials is Na 2 [Fe(CN) 5 NO] · 2H 2 O, in which metastable linkage isomers of the nitrosyl group can be generated by light irradiation resulting in huge changes of the refractive index up to Dn ∼ 10 -2 .Here we show that this type of photorefraction is a general property arising from the generation of linkage isomers and can thus be found in many compounds containing [ML 5 NO] m± complexes, where M is a transition metal, L a ligand, and m the formal charge of the anion/cation. The benefit of this generality is reflected in the tailoring properties of the photorefractive response such as the spectral sensitivity simply by selecting different representatives of the [ML 5 NO] m± compounds.Conventional photorefractive materials, [1] where the lightinduced modulation of the refractive index is caused by the linear electro-optic effect (Pockels effect), are widely applied in nonlinear optics.[2] They feature reversible photorefractivity without chemical processing allowing for dynamical holography, [3] and the kinetics of hologram formation is described by the well-known Kiev equations. [4] In recent years a second class of reversible photorefractive media for dynamical holography has been established, the unconventional photorefractive materials. Here an optical bistability is at the origin of photorefraction and the kinetics show a characteristic transient behavior.[5] The unique properties of this class were com-

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