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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TL;DR: In this paper, organo-metallic chalcones were synthesised via Knovoenagel reactions of ferrocen carboxaldehyde with two active methylene compounds.
Abstract: Purpose - To discuss synthesis and evaluation of organo-metallic chalcones as second-order nonlinear optical (SONLO) materials. Design/methodology/approach - The new chalcones have been synthesised via Knovoenagel reactions of ferrocen carboxaldehyde with two active methylene compounds. Findings - The ferrocenyl chalcones prepared have shown bathochromic shift and thermal stability in polymeric film. On heating the dye films up to 80°C the extent of degradation reached up to 12 per cent and very small amount of degradation was observed at 43 and 60°C. Originality/value - The paper shows that these compounds have UV-Vis bathochromic shift, enabling them to be used as SONLO materials in the blue domain as well as dyes. © Emerald Group Publishing Limited.
1 citations
TL;DR: In this article, theoretical calculations were carried out on a group of molecules with cationic centers, using finite field approach, to get a fundamental clear understanding of the structure-polarizability correlation.
Abstract: In order to get a fundamental clear understanding of the structure-polarizability correlation, theoretical calculations were carried out on a group of molecules with cationic centers, using finite field approach. The cationic design is very flexible and allows for a lot of tinkering and tuning by the incorporation of monomeric and polymeric, chiral or achiral anions to achieve the desired properties. Synthesis of the promising molecules are being carried out.
1 citations
20 Aug 2009
TL;DR: In this paper, the role of the conjugated spacer in the optimization of the first hyperpolarizability of organic============chromophores was investigated and interpreted in the context of the quantum limits.
Abstract: We investigate the role of the conjugated spacer in the optimization of the first hyperpolarizability of organic
chromophores. We propose a novel strategy for the optimization of the first hyperpolarizability that is based on the
variation of the degree of conjugation for the bridge that separates the donor and acceptors at the end of push-pull type
chromophores. The correlation between the type of conjugated spacer and the experimental nonlinear performance of the
chromophores is investigated and interpreted in the context of the quantum limits.
1 citations
Cites background from "Nonlinear optical properties of org..."
...All-optical information transmission, storage and retrieval, and manipulation requires good nonlinear-optical materials.[1-3] While at present, inorganic piezoelectric single crystals, such as LiNiO3 , are used in conjunction with laser diode sources to provide electro-optic amplitude modulation for long-haul optical data transmission systems, the purely electronic response of organic photonic materials would provide higher modulation frequencies, and, hence, wider bandwidths when used in modulator devices....
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TL;DR: In situ studies of second-harmonic generation in monolayers of pure hemicyanine dyes and their mixtures with arachidic acid at the air/water interface were performed as mentioned in this paper.
Abstract: In situ studies of second-harmonic generation (SHG) in monolayers of pure hemicyanine dyes and their mixtures with arachidic acid at the air/water interface were performed. The studies revealed an unexpected chemical instability of the hemicyanine dyes involving a cleavage of the stilbene double bond when deposited onto the water surface. This reaction occurred especially rapidly in the presence of the arachidic acid. Dilution with arachidic acid did not lead to a significant enhancement of the harmonic intensity.
1 citations
Cites background from "Nonlinear optical properties of org..."
...L-B deposition or organic noncentrosymmetric single crystals active side chains or guest molecules in polymers are frequently oriented in a strong electric field using electrodes or corona poling [2,3]....
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01 Jan 1991
TL;DR: In this article, it has been shown that polyacetylene can achieve metallic conductivity approaching that of copper when oxidized or reduced chemically or electrochemically (doping) (see Fig. 1 ).
Abstract: Over the past five or six years, rapid advances have been made in the field of photonics, or the manipulation of light by light. Although organic polymers have been generally regarded as insulators in the electronics industry, research advances in the area of electroactive materials have shown that polymers such as polyacetylene can achieve metallic conductivity approaching that of copper when oxidized or reduced chemically or electrochemically (doping). More recently, it has been recognized in our laboratory and others that electroactive materials also have exceptionally high optical nonlinearities. Research on these materials holds the promise that they indeed may be suitable for the eventual design of many nonlinear and electro-optic devices, including an all-optical computer.
1 citations