Nonlinear optical properties of organic and polymeric materials
About:
The article was published on 1983-09-29 and is currently open access. It has received 762 citations till now.read more
Citations
More filters
Journal ArticleDOI
Growth and characterization of an efficient new NLO single crystal L-phenylalanine D-methionine for frequency conversion and optoelectronic applications
Palanivelu Sangeetha,P. Jayaprakash,M. Nageshwari,C. Rathika Thaya Kumari,S. Sudha,M. Prakash,G. Vinitha,M. Lydia Caroline +7 more
Abstract: Optically active single crystals of L -phenylalanine D -methionine (LPDM) were grown by slow evaporation technique by co-crystallization of amino acids L -phenylalanine and D -methionine in water. The unit cell dimensions have been identified from single crystal X-ray diffraction technique. The existences of various hydrocarbyls were examined by FTIR and FT-Raman spectroscopy. The carbon and hydrogen environment of the grown crystals were analyzed by FT NMR spectrum. The optical absorption studies show that the crystal is transparent in the visible region with a lower cut-off wavelength of 259 nm and there by optical band gap energy E g is calculated to be 5.35 eV. The Urbach energy, extinction coefficient, reflectance were calculated from UV-absorption data. Further, the thermal stability and accurate melting point has been investigated by TG/DSC techniques. The Kurtz powder SHG was confirmed using Nd:YAG laser with fundamental wavelength of 1064 nm. The dielectric behavior of the specimen has been determined for various temperatures (313 K, 333 K, 353 K, 373 K) at different frequencies. Fluorescence study and the time resolved decay calculation was also performed for the LPDM crystal. Optical nonlinear susceptibility was measured in LPDM and the real and imaginary part of χ 3 was evaluated by Z-scan technique using open and closed apertures.
Journal ArticleDOI
Coupled-Hartree—Fock calculations of the third-order hyperpolarizabilities of substituted polydiacetylenes
TL;DR: In this paper, Coupled-Hartree-Fock calculations of the static third-order hyperpolarizabilities (γ) in the chain direction for regular polydiacetylene and several donor-acceptor (A) substituted oligomers through C 42 H 24 are carried out at the level of the INDO approximation.
Journal ArticleDOI
Development of Polymeric Nonlinear Optical Material
Thomas M. Leslie,Ronald N. DeMartino,E. Won Choe,Garo Khanarian,David R. Haas,Greg Nelson,James B. Stamatoff,Dago E. Sizietz,Chia-Chi Teng,Hyun-Nam Yoon +9 more
TL;DR: The molecular structural characteristics which give rise to large optical nonlinearities have been delineated by several key steps and has led to the development of a structural algorithm for the design of β molecules with high susceptibilities as discussed by the authors.
Journal ArticleDOI
Conformational dependence of the quadratic hyperpolarisabilities of a series of push-pull diaryl acetylenes: An experimental and computational investigation
TL;DR: In this paper, a combination of experimental and computational data are necessary to investigate the nonlinear optical response of push-pull diaryl acetylenes, and they have found, by using the AM1 semi-empirical method, that the molecules exist as conformational mixtures in solution.
Journal ArticleDOI
Optical, electro-optic and optoelectronic properties of natural and chemically modified DNAs
TL;DR: In this article, the optical, electro-optic, and optoelectronic properties of natural and modified DNAs have been investigated, including optical and fluorescence properties of organic lasing composites, nonlinear optical properties of light-emitting diodes, and photovoltaic cells based on natural and chemically modified DNA.