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.

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.

Nonlinear Magneto-Optical Kerr Effect in Gd-Containing Langmuir-Blodgett Films

1998 ◽  
Vol 517 ◽  
Author(s):  
N.V. Didenko ◽  
A.A. Fedyanisn ◽  
G.B. Khomutov ◽  
T.V. Murzina ◽  
O.A. Aktsipetrov
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Rayleigh Scattering ◽  
Second Harmonic ◽  
Rare Earth Ions ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Magneto Optical Kerr Effect ◽  
Wave Induced

AbstractMagnetization induced second harmonic generation (MSHG) is observed in Gd-containing Langmuir-Blodgett (LB) films. The nonlinear optical studies reveal significant alterations in the second harmonic generation (SHG) intensity and in the polarization and phase of the second harmonic (SH) wave induced by application of DC magnetic field. The violation of polarization selection rules and the diffusenes of the MSHG intensity indicates the inhomogeneity of LB structure and the hyper-Rayleigh scattering mechanism of MSHG. The latter proofs the existence of 2D-islands of Gd ions in the structural unit of the LB films which is composed by monolayer of rare-earth ions compressed between two layers of stearic acid molecules.

scholarly journals Functional 2D nanomaterials for optoelectronic equipment on the basis of langmuir–blodgett bacteriorhodopsin films

2016 ◽  
Vol 19 (2) ◽  
pp. 124-132
Author(s):  
S. I. Valyanskii ◽  
E. K. Naimi ◽  
L. V. Kozhitov
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Langmuir Blodgett ◽  
Surface Plasma Waves ◽  
Langmuir Blodgett Films ◽  
Monomolecular Layers

We have tested the possibility of using monomolecular layers of bacteriorhodopsin (BR) for the synthesis of highly sensitive and highly selective sensors based on second harmonic generation and surface plasma waves. We have used various methods to study the optical and nonlinear optical properties of Langmuir-Blodgett films of BR in order to clarify the extent to which specific properties of BR molecules are retained during their transfer from the surface of water to a solid substrate. We show that the second harmonic generation method is efficient for analyzing the molecular orientation and quality of Langmuir-Blodgett films. The experimental nonlinear optical susceptibility of second order BR molecules is 3.4 · 10-11m/V. The relative change in the resonant wave vector is (3.6 ± 0.1)·10-2at an excitation light wavelength of 630 nm. We have obtained a BR spectrum with the effective excitation by incident radiation of surface plasma waves. On the basis of these studies, we have proposed new schemes of biosensors operating on the basis of second harmonic generation and surface plasma resonance caused by fundamental frequency reflection from BR monomolecular layers. This scheme was tested for a model device and demonstrated the possibility of obtaining sensitivities of the order of 1011molecules/cm3.

Second Harmonic Generation in Langmuir-Blodgett Films of N-Docosyl-4-Nitroaniline

1991 ◽  
pp. 157-166
Author(s):  
T. Geisler ◽  
S. Rosenkilde ◽  
W. M. K. P. Wijekoon ◽  
P. N. Prasad ◽  
P. S. Ramanujam
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

K2Sn2ZnSe6, Na2Ge2ZnSe6, and Na2In2GeSe6: a new series of quaternary selenides with intriguing structural diversity and nonlinear optical properties

2016 ◽  
Vol 45 (18) ◽  
pp. 7627-7633 ◽  
Author(s):  
Molin Zhou ◽  
Chao Li ◽  
Xiaoshuang Li ◽  
Jiyong Yao ◽  
Yicheng Wu
Keyword(s):  
Optical Properties ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Structural Diversity ◽  
Nonlinear Optical Properties

New selenides K2Sn2ZnSe6, Na2Ge2ZnSe6, and Na2In2GeSe6 exhibit diverse structures and Na2In2GeSe6 possesses a moderate second harmonic generation response.

Sign in / Sign up

Export Citation Format

Share Document