A Two-Legged Spacer Molecule for Alternate Layer LB Film Deposition with Optically Nonlinear Dyes

1992 ◽  
Vol 247 ◽  
Author(s):  
G. J. Ash Well ◽  
W. A. Crossland ◽  
P. J. Martin ◽  
P. A. Thompson ◽  
A. T. Hewson ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Film Deposition ◽  
Nonlinear Optical Susceptibility ◽  
Langmuir Blodgett ◽  
Lb Film ◽  
Active Layers ◽  
Optical Susceptibility ◽  
Langmuir Blodgett Films ◽  
Alternate Layer

ABSTRACTSecond harmonic generation from Langmuir-Blodgett films of E-N-octadecyl-4-(2-(4-dimethylaminophenyl)ethenyl)pyridinium iodide (a hemicyanine) interleaved with 4, 4'-dioctadecyl-3, 5, 3', 5'-tetramethyldipyrrylmethene hydrobromide (spacer) increases quadratically with the number of active layers, the second-order nonlinear optical susceptibility of film structures comprising from 1 to 150 bilayers being 70 pm/V. The synthesis and nonlinear optical properties are reported.

Langmuir-Blodgett Films of Novel Diacetylene-Containing Polymers with High Second Order Nonlinear Optical Susceptibility

2006 ◽  
Vol 446 (1) ◽  
pp. 209-217
Author(s):  
Ma. del Pilar Carreón-Castro ◽  
Jesús Ramírez ◽  
Margarita Rivera ◽  
Takeshi Ogawa ◽  
Yukie Kawazu ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Order ◽  
Nonlinear Optical Susceptibility ◽  
Langmuir Blodgett ◽  
Optical Susceptibility ◽  
Langmuir Blodgett Films

Second harmonic generation from alternate-layer LB films: quadratic enhancement with film thickness

1994 ◽  
Vol 445 (1924) ◽  
pp. 385-398 ◽  
Keyword(s):  
Optical Properties ◽  
Second Harmonic Generation ◽  
Film Thickness ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Alternate Layer ◽  
Order Susceptibility

The second harmonic generation (SHG) from alternate-layer Langmuir-Blodgett (LB) films of stilbazolium dyes and 4, 4'-dioctadecyl-3, 5, 3', 5'-tetramethyldipyrryl-methene hydrobromide increases as I 2ω(N) = l 2ω(1) N 2 for N ≥ 2 bilayers, but the equivalent monolayer signal ( I 2ω(1) ) is significantly less than the intensity from LB monolayers of the corresponding dye on glass. This is attributed, in part, to the different molecular tilts and, in part, to the position of the anion which influences the charge distribution within the chromophore. For alternate-layer films of E-N-octadecyl-4-[2-(4-dimethylaminophenyl)ethenyl]pyridinium octadecylsulphate (dye I) the second-order susceptibility and chromophore tilt angle are χ (2) zzz = 45 pm V -1 and ϕ = 30° respectively, whereas the methoxy congener, E-N-octadecyl-4-[2-(4-methoxyphenyl)ethenyl]pyridinium octadecylsulphate (dye II), has χ (2) zzz = 11 Pm V -1 and ϕ = 35°. The nonlinear optical properties of such films are dependent upon the compatibility of the dye and spacer.

LANGMUIR–BLODGETT FILMS AND MOLECULAR ELECTRONICS

2009 ◽  
Vol 23 (29) ◽  
pp. 3437-3451 ◽  
Author(s):  
SYED-ARSHAD HUSSAIN ◽  
D. BHATTACHARJEE
Keyword(s):  
Molecular Electronics ◽  
Molecular Level ◽  
Film Deposition ◽  
Main Concern ◽  
Preparation Technique ◽  
Langmuir Blodgett ◽  
Lb Film ◽  
Interdisciplinary Field ◽  
Langmuir Blodgett Films ◽  
The Subject

Molecular electronics is a new, exciting and interdisciplinary field of research. The main concern of the subject is to exploit the organic materials in electronic and optoelectronic devices. On the other hand, the Langmuir–Blodgett (LB) film deposition technique is one of the best among few methods used to manipulate materials at the molecular level. In this article, the LB film preparation technique is discussed briefly with an emphasis on its application towards molecular electronics.

SECOND ORDER NONLINEAR OPTICAL PROPERTIES OF LANGMUIR–BLODGETT FILMS CONSISTING OF NON-AMPHIPHILIC POLAR MOLECULES

2004 ◽  
Vol 13 (03n04) ◽  
pp. 355-358 ◽  
Author(s):  
JUN KAWAMATA ◽  
SHOICHIRO HIRAKAWA ◽  
SEIJI TANI ◽  
YUICHIRO OGATA ◽  
AKIHIKO YAMAGISHI
Keyword(s):  
Optical Properties ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Single Layer ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Langmuir Blodgett Films

We have prepared hybrid Langmuir–Blodgett (LB) films consisting of a clay single layer and a non-amphiphilic polar molecule, 2,5-bis(p-dimethylaminocinnamylidene)-cyclopentanone. LB films deposited on solid substrates were characterized by means of UV-vis absorption spectroscopy and optical second-harmonic generation (SHG) measurements.

Improved Second Harmonic Generation from Langmuir-Blodgett Films of an Azacrown Ether Fullerene Derivative

1994 ◽  
Vol 349 ◽  
Author(s):  
David A. Leigh ◽  
Frances Wade ◽  
Terry A. King ◽  
David West ◽  
Gurmit S. Bahra
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Fullerene Derivative ◽  
Azacrown Ether ◽  
Langmuir Blodgett ◽  
Lb Film ◽  
Film Forming ◽  
Langmuir Blodgett Films ◽  
Order Susceptibility

The amphiphilic fullerene derivative (1-aza-18-crown-6)-hydrofullerene-60 (C60-1A18C6, 1) exhibits improved Langmuir and Langmuir-Blodgett (LB) film forming properties and the resulting LB films exhibit a nonlinear second order susceptibility, X(2)pp of 3.2 pm/V, the highest yet reported for a fullerene or fullerene derivative.

Nonlinear Optical Susceptibility of Tetragonal BaTiO3

2011 ◽  
Vol 222 ◽  
pp. 275-278
Author(s):  
Arnis Gulbis
Keyword(s):  
Power Series ◽  
Nonlinear Optical ◽  
Lattice Distortion ◽  
Second Harmonic ◽  
Optical Rectification ◽  
Nonlinear Optical Susceptibility ◽  
Optical Susceptibility ◽  
Order Of Magnitude ◽  
Low Symmetry ◽  
Tetragonal Batio

In the framework of the vibronic theory of ferroelectricity for the transparency region of tetragonal BaTiO3 components and of nonlinear optical susceptibility responsible for the second harmonic generation and the optical rectification are calculated. Selection rules for dipole transitions in the Γ point of the first Brilouin zone are extended over the whole zone. Calculations are confined to lowest order in expansion of susceptibilities in power series of low symmetry lattice distortion. Numerical values of susceptibilities have experimentally observed order of magnitude. The spectral behavior of and is calculated as well.

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