Langmuir-Blodgett Film of a Processable Polydiacetylene with Tricyanovinyldialkylaniline Chromophore

1999 ◽  
Vol 598 ◽  
Author(s):  
D.-C. Lee ◽  
L. Li ◽  
L. A. Samuelson ◽  
D. J. Sandman
Keyword(s):  
Second Harmonic ◽  
Visible Absorption ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Compression Direction ◽  
Ir Studies ◽  
Out Of Plane ◽  
New Strategy ◽  
Uv Visible ◽  
Langmuir Blodgett Film

ABSTRACTA soluble and processable polydiacetylene (PDA) with functionalizable N,N-dialkylaniline and glutamate ester substituted alkylurethane side groups was synthesized. This PDA was further reacted with tetracyanoethylene to effect postpolymerization functionalization. This new strategy further functionalizes conjugated polymers and introduces a tricyanovinyl (TCV)-aniline chromophore. The resulting polymer was soluble in common organic solvents. Asymmetric multilayers of the tricyanovinylated PDA were fabricated using the Langmuir-Blodgett (LB) technique. Thickness, visible absorption, and second harmonic (SH) intensity were found to increase linearly as a function of the number of layers. Polarized UV-visible and IR studies revealed that the main chain preferentially orients vertical to the compression direction with out-of-plane orientation of the TCV-aniline group with respect to the glass substrate. The resonant enhanced second-order nonlinear optical (NLO) coefficient (d33) of the 20 LB layers was found to be 21 pm/V at 1.064 µm, while no SHG signal was observed for cast or spincoated films.

Langmuir-Blodgett Film and Second Harmonic Generation of C60(C4H8N2)

1994 ◽  
Vol 98 (48) ◽  
pp. 12459-12461 ◽  
Author(s):  
L. B. Gan ◽  
D. J. Zhou ◽  
C. P. Luo ◽  
C. H. Huang ◽  
T. K. Li ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Film

Preparation of Chromophoric Dipolar Dendrons as Second-Order Nonlinear Optical Material

1997 ◽  
Vol 488 ◽  
Author(s):  
S. Yokoyama ◽  
S. Mashiko
Keyword(s):  
Thin Films ◽  
Second Harmonic ◽  
Nonlinear Optical Material ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Molecular Hyperpolarizability ◽  
Donor Acceptor ◽  
Film Transfer ◽  
Azobenzene Chromophore ◽  
Langmuir Blodgett Film

AbstractDendritic macromolecules, called “dendrons,” having a branching structure modified with an electron donor/acceptor functionalized azobenzene chromophore have been synthesized. The structurally different dendrons possess different numbers, 1, 3, 7, and 15, of chromophore units. The second harmonic generation (SHG) of dendrons was measured in the molecular oriented thin films prepared by the Langmuir-Blodgett film transfer technique. In such structurally organized thin films, individual chromophores coherently contribute to the increase in the molecular hyperpolarizability of dendrons. The SHG activity became large as the numbers of branching units of dendrons increased. The highest molecular hyperpolarizability was found to be <8000×10−30 esu for dendron containing 15 chromophoric units. The SHG results suggest that the structure of dendrons synthesized is uniaxially dipolar, and that there is a particular merit in this structure for the generation of SHG.

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