Recent Studies On The Nonlinear Optical Properties Of Conjugated Linear Chains And Rigid Rod Polymers

1988 ◽  
Author(s):  
A. F. Garito ◽  
J. R. Heflin ◽  
K. Y. Wong ◽  
O. Zamani-Khamiri
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Linear Chains ◽  
Rigid Rod

Microwave Irradiation Synthesis of Mo(W)/Tl/S Linear Chains and Their Nonlinear Optical Properties in Solution

1996 ◽  
Vol 35 (26) ◽  
pp. 7924-7927 ◽  
Author(s):  
Jianping Lang ◽  
Kazuyuki Tatsumi ◽  
Hiroyuki Kawaguchi ◽  
Jianmei Lu ◽  
P. Ge ◽  
...  
Keyword(s):  
Optical Properties ◽  
Microwave Irradiation ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Linear Chains

Third-order nonlinear optical properties of conjugated rigid-rod polyquinolines

1992 ◽  
Vol 96 (7) ◽  
pp. 2837-2843 ◽  
Author(s):  
Ashwini K. Agrawal ◽  
Samson A. Jenekhe ◽  
Herman Vanherzeele ◽  
Jeffrey S. Meth
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Third Order ◽  
Rigid Rod

Preparation and Third-Order Nonlinear Optical Properties of Host-Guest Molecular Composites

1992 ◽  
Vol 277 ◽  
Author(s):  
Samson A. Jenekhe ◽  
Michael F. Roberts ◽  
Jeffrey S. Meth ◽  
Herman Vanherzeele
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Nylon 66 ◽  
The Matrix ◽  
Molecular Composites ◽  
Important Approach ◽  
Ladder Polymers ◽  
Rigid Rod ◽  
Linear And Nonlinear

ABSTRACTHost-guest molecular composites of conjugated rigid-rod polymers in the matrix of flexible-chain polymers were prepared from blend solutions of the Lewis acid complexes of the component polymers. Molecular composites of poly(p-phenylene benzobisthiazole) (PBZT) with the polyamides Nylon 66 and PTMHT were prepared and their linear and nonlinear optical properties were investigated by optical absorption and third harmonic generation spectroscopy, respectively. Dispersion of PBZT in a polyamide matrix was found to result in reduced π-electron interactions as evidenced by the narrowing of the main absorption band. The χ(3) spectra of composites were measured in the wavelength range 0.8–2.4μm which spans the resonant and nonresonant regions. Nonresonant χ(3) at 1.9μtm was studied as a function of composite composition and linear and nonlinear dependences of χ(3) with mole fraction of PBZT were observed for nylon 66 and PTMHT composites respectively. Our findings that both χ(3) and χ(3)/α can be enhanced in molecular composites suggest that this is an important approach to optimize materials for nonlinear optics. Preliminary results of our studies of other new molecular composites of rigid-rod and ladder polymers are also discussed.

Third-Order Nonlinear Optical Properties of a Series of Systematically Designed Conjugated Rigid-Rod Polyquinolines

1992 ◽  
Vol 247 ◽  
Author(s):  
Ashwini K. Agrawal ◽  
Samson A. Jenekhe ◽  
Herman Vanherzeele ◽  
Jeffrey S. Meth
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Scaling Law ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Properties ◽  
Model Compounds ◽  
Third Order ◽  
Third Harmonic ◽  
The Third ◽  
Rigid Rod

ABSTRACTThe third-order nonlinear optical properties of thin films of two series of conjugated rigid-rod polyquinolines, exemplified by poly(2, 2'-(l, 4-phenylene)-6, 6'-bis(4-phenyl quinoline)) (PPPQ, 2d) and poly(2, 7-(l, 4-phenylene)-4, 9-diphenyl-l, 6-anthrazoline) (PPDA, 3d), were investigated by third harmonic generation spectroscopy. Of the nine polyquinolines with diverse backbone structures, PPPQ has the largest optical nonlinearity with a χ(3) (-3ω; ω, ω, ω) value of 3.2 × 10−12 esu and 3.3 × 10−11 esu in the off-resonant and three-photon resonant regions, respectively. A comparison of the nonresonant χ(3) of the series of nine systematically derived polyquinolines showed that a scaling law of the form χ(3) ∼ (λmax)v ∼ Eg-v does not hold; in fact, the nonresonant χ(3) was essentially independent of the optical bandgap. These results suggest that structure-χ(3) propeny relationships in polymers cannot be inferred from those of oligomers and model compounds.

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