Quantum Lattice Fluctuations and the Linear and Nonlinear Optical Susceptibility of Degenerate Ground State Conjugated Polymers

1993 ◽  
Vol 113 ◽  
pp. 65-81 ◽  
Author(s):  
T. W. Hagler ◽  
A. J. Heeger
Keyword(s):  
Conjugated Polymers ◽  
Ground State ◽  
Nonlinear Optical ◽  
Nonlinear Optical Susceptibility ◽  
Quantum Lattice ◽  
Optical Susceptibility ◽  
Degenerate Ground State ◽  
Linear And Nonlinear ◽  
Lattice Fluctuations

The Nonlinear Optical Properties of Polyacetylene within the Intermediate Exciton Formalism

1992 ◽  
Vol 247 ◽  
Author(s):  
David Yaron ◽  
Robert Silbey
Keyword(s):  
Ground State ◽  
Nonlinear Optical ◽  
Characteristic Length ◽  
Infinite Chain ◽  
Ring Size ◽  
Third Order ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
P Type ◽  
Ci Approximation

ABSTRACTWithin the Singles-CI approximation, the perturbation theory expression for γ (the non-resonant third-order nonlinear optical susceptibility) contains a class of terms which correspond to (i) the creation of an s-type exciton (ii) a transition to a p-type exciton, and (iii) a return to the ground state through an s-type exciton. The contribution of these terms to γ is considered in the limit of an infinite chain of polyacetylene. The infinite chain limit is obtained by considering a ring of polyacetylene and allowing the ring size to go to infinity. The limit is approached using three methods, each of which reveals a different characteristic length of the system. The form of the excitons is found to be independent of ring size for rings which are larger than the size of the exciton.

Quantum Lattice Fluctuations and Nonlinear Optics of Conducting Polymers

1989 ◽  
Vol 173 ◽  
Author(s):  
J. Yu ◽  
B. Friedman ◽  
W. P. Su
Keyword(s):  
Optical Properties ◽  
Nonlinear Optics ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Nonlinear Optical ◽  
Molecular Model ◽  
Nonlinear Optical Properties ◽  
Quantum Lattice ◽  
Quantitative Calculations ◽  
Lattice Fluctuations

ABSTRACTQuantum lattice fluctuations of conjugated polymers in the form of virtual soliton-antisoliton pairs have important effects on the nonlinear optical properties. Quantitative calculations of nonlinear susceptibilities based on the solitonic molecular model are presented.

Third Order Nonlinear Optical Susceptibility of Trans-(CH)x: A Degenerate Ground State Conjugated Polymer

1987 ◽  
Vol 109 ◽  
Author(s):  
M. Sinclair ◽  
D. Moses ◽  
K. Akagi ◽  
A. J. Heeger
Keyword(s):  
Oscillator Strength ◽  
Nonlinear Optical ◽  
Nonlinear Effects ◽  
Fast Response ◽  
Charge Carriers ◽  
Third Order ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
Degenerate Ground State ◽  
Time Regime

ABSTRACTThe promise of conducting polymers as fast response nonlinear optical materials has been recently emphasized [1,3]. Polymers such as polyacetylene, polythiophene and the soluble (and processible) poly(3-alkylthienylenes) contain a high density of x-electrons, and they are known to exhibit photoinduced absorption and photoinduced bleaching, indicating major shifts of oscillator strength upon photoexcitation [2,4]. For polyacetylene, these nonlinear effects have been studied in detail in the picosecond [5a,b] and sub-picosecond [5c] time regime and correlated with the photoproduction of charge carriers through fast photoconductivity measurements [6]. The data have demonstrated ultra-fast response with nonlinear shifts in oscillator strength occurring at times of the order of 10-13 seconds. These resonant nonlinear optical properties are intrinsic; they originate from the nonlinearity of the self-localized photoexcitations [7] which characterize this class of polymers: solitons, polarons and bipolarons [4].

scholarly journals Lithium borate Li3B5O8(OH)2with large second harmonic generation and a high damage threshold in the deep-ultraviolet spectral range

2017 ◽  
Vol 19 (45) ◽  
pp. 30703-30714 ◽  
Author(s):  
A. H. Reshak
Keyword(s):  
Electronic Structure ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Damage Threshold ◽  
Lithium Borate ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
Deep Ultraviolet ◽  
Linear And Nonlinear

The electronic structure and linear and nonlinear optical susceptibility dispersions of lithium borate Li3B5O8(OH)2are comprehensively investigated.

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