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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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Journal ArticleDOI
TL;DR: In this paper, a technique for the polymerization of aminoacids to form vertically oriented helices on gold surfaces was proposed, where the helical columns are oriented to a major extent vertically relative to the surface.
Abstract: A large number of criterion must be met for a material to be of practical value in the development of wave guide optical switches. We have taken the approach that optimal and permanent orientation is of prime importance. We have addressed the question of alignment by developing techniques for the polymerization of aminoacids to form vertically oriented helices on gold surfaces. Using this approach, we have been able to grow layers of alanine, methylalanine (ethylglycine), leucine, and phenylalanine on gold deposited on silicon that are 1 - 2000 A thick. Further, grazing angle, FTIR measurement are consistent with the presence of only helical peptides for alanine and 90–95% helical forms of the peptides derive from the other aminoacids. These helical columns are oriented to a major extent vertically relative to the surface. The key feature that of the technique is the use of a base attachment for the gold surface that maps out the correct surface area corresponding to that required for the helices...

22 citations

Journal ArticleDOI
TL;DR: In this paper, powder X-ray diffraction was used to compute unit cell parameters and dislocation density of 8-hydroxyquinolinium 2-carboxy-6-nitrophthalate monohydrate (8HQNP) crystal.

22 citations

Journal ArticleDOI
TL;DR: In this article, a correction vector method for the computation of linear and nonlinear optical properties of π-conjugated systems has been devised for use with a singly and doubly excited configuration interaction model (SDCI).
Abstract: The sum‐over‐states (SOS), time dependent perturbation theory expansion over molecular eigenstates method for the computation of molecular hyperpolarizabilities is briefly reviewed. A correction vector method for the computation of linear and nonlinear optical properties of π‐conjugated systems has been devised for use with a singly and doubly excited configuration interaction model (SDCI). The SOS approach and the correction vector method are equivalent when the same basis set of many‐electron configurations is used in both. It has been verified that the values obtained from the correction vector method and by direct summation over eigenstates are identical. The correction vector method has been found to be very efficient for larger systems, both in terms of central processing unit (CPU) time and storage requirements. The direct SOS summation has been used to study the approach to the final SDCI values as excited states are added in order of increasing energy. Using the methods described in the previous ...

22 citations

Journal ArticleDOI
TL;DR: In this paper, a quasi-cw 1064 nm Nd:YAG laser was used to generate green 532 nm light from organic nonlinear optical crystals of 4−(N,Ndimethylamino)−3−acetamidonitrobenzene (DAN) immersed in index matching fluid contained in an antireflection-coated cuvette.
Abstract: We have demonstrated intracavity second‐harmonic generation of green 532 nm light in a quasi‐cw 1064 nm Nd:YAG laser using organic nonlinear optical crystals of 4‐(N,N‐dimethylamino)‐3‐acetamidonitrobenzene (DAN) immersed in index matching fluid contained in an antireflection‐coated cuvette. This technique permits crystals to be used directly from solution growth without polishing or antireflection coating them. Up to 0.56 mW peak power of 532 nm light was generated from 2.3 W of intracavity 1064 nm peak power in 100 μs pulses. We also report preliminary results on true cw intracavity harmonic generation with antireflection‐coated DAN crystals.

22 citations

Journal ArticleDOI
TL;DR: In this article, the solubility of the synthesized material was determined in water, acetone, and water-acetone mixed solvents, based on which the single crystals of BHM were grown from the 4:5 water−acetone-mixed solvent by the solvent evaporation method.

21 citations