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 article, a comparison between routine and non-routine methods of growing organic crystals are discussed and compared between these methods and those that are more suitable for inorganic or protein crystal growth.
20 citations
TL;DR: It is found that both linear and nonlinear optical responses are greatly enhanced by a single low-lying charge-transfer state.
Abstract: We have observed large second-order nonlinear optical and vibrational circular dichroism (VCD) responses in a charge-transfer-type L-Histidinium salt. Using X-ray Diffraction, VCD spectroscopy, and time-dependent density functional theory to characterize the compound, we employ a two-level model to explain and quantify the strongly enhanced optical signals. We find that both linear and nonlinear optical responses are greatly enhanced by a single low-lying charge-transfer state.
20 citations
TL;DR: In this article, the preparation and characterization of Langmuir-Blodgett films containing 4-(N-hydroxyalkyl)amino-4′-nitroazobenzene dyes (with alkyl≡hexyl and dodecyl) are discussed.
20 citations
TL;DR: A thermally cross-linkable, second-order nonlinear optical (NLO) polymer containing ethynyl groups has been synthesized in this article, which can undergo thermal intramolecular or intermolecular reactions with amide groups to form heterocyclic structures or cross linkages.
Abstract: A thermally cross‐linkable, second‐order nonlinear optical (NLO) polymer containing ethynyl groups has been synthesized The ethynyl groups in the polymer backbone can undergo thermal intramolecular or intermolecular reactions with amide groups to form heterocyclic structures or cross linkages The thermal curing of the polymer can be simultaneously effected during electric poling and second‐harmonic generation measurements indicated that the cured polymers indeed showed high stability in dipole orientation; no obvious decay at room temperature for more than 1000 h Long‐term stability of second‐harmonic coefficients was observed even at 90 °C, at least for 500 h
20 citations
TL;DR: Several aromatic polyisoimides were prepared, and their third-order nonlinear susceptibilities, χ (3) (−3 ω, ω, ω ), were measured by optical third-harmonic generation as discussed by the authors.
Abstract: Several aromatic polyisoimides were prepared, and their third-order nonlinear susceptibilities, χ (3) (−3 ω , ω , ω , ω ), were measured by optical third-harmonic generation. Obtained χ (3) values are in the order of 10 −12 e.s.u. at a fundamental wavelength of 1907 nm. The largest value, χ (3) =3.4×10 −12 e.s.u., was obtained for the polyisoimide prepared from pyromellitic dianhydride (PMDA) and p -phenylenediamine(PDA). Thermal stability of the polyisoimide prepared from PMDA and PDA was tested. The contents of isoimide structure decreases due to thermal imidization above 200°C.
20 citations