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MonographDOI

Nonlinear optical properties of organic and polymeric materials

29 Sep 1983-
About: The article was published on 1983-09-29 and is currently open access. It has received 762 citations till now.
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Book ChapterDOI
01 Jan 1990
TL;DR: In this paper, the synthesis of porphyrins and phthalocyanines using macrocycles has been described, and the different ways to use the macrocycles for the mentioned properties.
Abstract: Phthalocyanines and related complexes are important compounds due to their special electrical and optical properties. This article describes, after a more preparative part on the synthesis of porphyrins and phthalocyanines, the different ways to use the macrocycles for the mentioned properties.

152 citations

Journal ArticleDOI
TL;DR: In this article, the electronic and dipolar properties of the all-trans retinyl polyene in light-adapted bacteriorhodopsin were examined by using two-photon double resonance spectroscopy to assign the Franck-Condon maxima, the absolute twophoton absorptivities and the change in dipole moments upon excitation of the low-lying "forbidden"" 1A*−g "like and "allowed" 1B*+u "like" states.
Abstract: The electronic and dipolar properties of the all‐trans retinyl polyene in light‐adapted bacteriorhodopsin are examined by using two‐photon double resonance spectroscopy to assign the Franck–Condon maxima, the absolute two‐photon absorptivities and the change in dipole moments upon excitation of the low‐lying ‘‘forbidden’’ 1A*−g ‐like and ‘‘allowed’’ 1B*+u ‐like π, π* excited singlet states. The second‐order hyperpolarizability is also determined. The two‐photon double resonance spectrum, collected with laser excitation from 820–1200 nm in 10 nm steps, displays two maxima, an intense band at ∼18 000 cm−1 assigned to the 1B*+u ‐like π, π* excited singlet state and a weaker shoulder at ∼21 000 cm−1 assigned to the 1A*−g ‐like π, π* excited singlet state. Thus, the 1A*−g ‐like state is 3500±500 cm−1 above the 1B*+u ‐like state, which is indicative of a protonated Schiff base chromophore.A log‐normal fit of the two‐photon spectrum indicates that the maximum two‐photon absorptivity of the 1B*+u ‐like state is 2...

150 citations

Journal ArticleDOI
TL;DR: In this paper, a new organic stilbazolium derivative crystal 2-[2-(3-hydroxy-4-methoxy-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate dehydrate (C25H23NO5S·2H2O) (VSNS) was synthesized successfully.
Abstract: A new organic stilbazolium derivative crystal 2-[2-(3-hydroxy-4-methoxy-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate dehydrate (C25H23NO5S·2H2O) (VSNS) was synthesized successfully. Single crystals were grown in a mixed solvent of methanol–acetonitrile (1 : 1) using a slow evaporation method at room temperature. Solubility of the synthesized VSNS material was experimentally determined for various temperatures using a methanol–acetonitrile mixed solvent. A single crystal X-ray diffraction study confirmed the crystal structure and morphology of VSNS. The crystalline nature of the title material was analyzed by powder X-ray diffraction analysis, and the presence of expected functional groups and the molecular structure of VSNS was identified by FT-IR and 1H NMR spectroscopic studies. Optical absorption was recorded using UV-Vis-NIR spectral analysis, and linear optical constants such as the absorption coefficient, band gap, extinction coefficient, refractive index and reflectance were calculated. The luminescence property of the crystal grown showed green emission radiation. The thermal stability of the crystal was analyzed by TG–DTA studies, and the hardness, Meyer index, yield strength, and elastic stiffness constant were estimated using a Vickers microhardness tester. Layer growth pattern was observed in chemical etching studies using a Carl Zeiss optical microscope at 50× magnification. Laser damage threshold energy was measured using an Nd:YAG laser (1064 nm). Variation of the dielectric response of the grown crystal was studied at room temperature. The third-order nonlinear optical property of VSNS was investigated in detail using a Z-scan technique with He–Ne laser at 632.8 nm. The second-order molecular hyperpolarizability γ of the crystal grown was 7.986 × 10−34 esu. This encouraging result of the Z-scan studies suggests that the VSNS crystal is a candidate material for photonics devices, optical switches, and optical power limiting applications.

145 citations