A STUDY ON THE SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF AZO-DYE CHROMOPHORES CONTAINING THE ELECTRON-ACCEPTOR GROUP

2008 ◽  
Vol 22 (17) ◽  
pp. 1633-1640
Author(s):  
CHUANYU WANG ◽  
TINGCHAO HE ◽  
CHANGSHUN WANG ◽  
YANG HUI ◽  
GUOYUAN LU
Keyword(s):  
Electron Acceptor ◽  
Azo Dye ◽  
Second Order ◽  
First Hyperpolarizability ◽  
Dye Molecules ◽  
H Nmr ◽  
Acceptor Group ◽  
Ft Ir ◽  
Second Order Nonlinearity ◽  
Maker Fringe

Two new azo-dye chromophores containing different electron-acceptor groups were synthesized and characterized by 1 H NMR, FT-IR and UV-vis spectra, respectively. The second-order nonlinearity of azo-dyes doped films in poly (methylmethacrylate) and the first hyperpolarizability of the azo molecules were investigated by the Maker Fringe method and the solvatochromic method, respectively. Experimental results showed that both of the two dyes exhibited large second-order nonlinearity (d33 > 30 pm/v) and the stronger electron-acceptor groups in dye molecules would induce larger second-order nonlinearity. This was confirmed by the measurement of the first hyperpolarizability.

Second-order nonlinear optical properties of polyphosphazenes containing multi-dipolar and imidazolebased chromophores

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Pan Yang ◽  
Tang Xiaozhen
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Coupling Reaction ◽  
Second Order ◽  
Azo Coupling ◽  
H Nmr ◽  
New Type ◽  
Ft Ir ◽  
Nlo Chromophores ◽  
Second Order Nonlinearity

AbstractThe synthesis and second-order nonlinearity study of several new polyphosphazenes were described, which are composed of a new type of Yshaped nonlinear optical (NLO) chromophores attached onto polyphosphazene. They were obtained via a post-azo coupling reaction. The resulting materials were characterized by means of 1H NMR, 31P NMR, FT-IR, UV-vis, GPC and DSC. Chromophore contents up to 14 mol% have been realized. The polymers have high glass-transition temperatures, good optical transparency, and the poled film of P3- P8 revealed a resonant d33 value in the range of 11-42 pm/V by second harmonic generation (SHG) measurements.

SECOND-ORDER NONLINEAR OPTICAL SUSCEPTIBILITIES OF POLY[(HEXA-2,4-DIYNYLENE-1,6-DIOXY)DIBENZOATES] CONTAINING AZO CHROMOPHORE DISPERSE RED 19 BY ELECTROABSORPTION SPECTROSCOPY

2006 ◽  
Vol 15 (04) ◽  
pp. 455-463 ◽  
Author(s):  
GUSTAVO GÓMEZ-SOSA ◽  
TAKESHI OGAWA ◽  
TAKASHI ISOSHIMA ◽  
MASAHIKO HARA
Keyword(s):  
Azo Dye ◽  
Nonlinear Optical ◽  
Second Order ◽  
First Order ◽  
Electroabsorption Spectroscopy ◽  
Azo Chromophore ◽  
Maker Fringe

The second-order nonlinear optical susceptibilities χ(2) of two isomeric polymers containing an azo dye, Disperse Red 19, were determined by the first-order electroabsorption spectroscopy (EAS), and compared with values previously obtained by SHG measurements. The para-polymer was found to have higher susceptibility than the corresponding meta-polymer. χ(2) were found to be 5–6 × 10-8 esu, which are comparable to those obtained by the Maker Fringe method.

Synthesis and Optical Properties of Dipolar Thiazole Derivatives Incorporating Nitro and Amino Substituents

2018 ◽  
Vol 773 ◽  
pp. 157-161
Author(s):  
Ahmad Shah Noor Aisyah ◽  
Nur Farahin Pairan ◽  
Noor Azilah Mohd Kasim ◽  
Bohari Mohd Yamin
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Electron Acceptor ◽  
Decomposition Temperature ◽  
Amino Group ◽  
Thiazole Derivatives ◽  
Good Thermal Stability ◽  
H Nmr ◽  
Ft Ir ◽  
C Nmr

We report the synthesis of two dipolar thiazole derivatives functionalized with nitro group as electron acceptor and amino group as electron donor, in order to study their optical properties in the UV-vis range. Their structures were verified by 1H NMR, 13C NMR, HRMS and FT-IR. The resulted thiazole derivatives have good thermal stability with decomposition temperature, Td of 320.20 °C and 284 °C for compounds 1 and 2 respectively. The absorbance bands of compound 2 in the UV-vis range are more red-shifted than that of compound 1 which made compound 2 could have high potential as a great organic NLO material.

Optical second-order nonlinearity of transparent glass-ceramics containing BaTiO3 precipitated via surface crystallization

1999 ◽  
Vol 14 (9) ◽  
pp. 3640-3646 ◽  
Author(s):  
Aiko Narazaki ◽  
Katsuhisa Tanaka ◽  
Kazuyuki Hirao
Keyword(s):  
Nonlinear Optical ◽  
Fringe Pattern ◽  
Second Harmonic ◽  
Glass Ceramics ◽  
Second Order ◽  
Transparent Glass ◽  
Heat Treated ◽  
Nonlinear Optical Coefficient ◽  
Second Order Nonlinearity ◽  
Maker Fringe

Second-harmonic generation of transparent glass-ceramics containing BaTiO3 crystalline phase was investigated using Maker fringe method. When 15BaO · 15TiO2 · 70TeO2 glass was heat-treated at 415 °C for 0.5–12 h, (101)- or (110)-oriented BaTiO3 crystals precipitated in the near-surface region. The resultant glass-ceramics exhibit second-harmonic generation. Variation of second-harmonic intensity with angle of incidence, i.e., the Maker fringe pattern changes drastically with an increase in heat treatment time and temperature. No second-harmonic signal was detected in glass-ceramics derived from 15SrO · 15TiO2 · 70TeO2 glass. These facts suggest that BaTiO3 crystal is responsible for the second-order nonlinear phenomenon, although its structure is closer to cubic than tetragonal according to x-ray diffraction measurements. In order to estimate second-order nonlinear optical coefficient d(2), Maker fringe patterns of the BaTiO3-containing glass-ceramics were analyzed. For the glass-ceramic after heat treatment for 0.5 h, d33 and thickness of BaTiO3-crystallized layer, L, are 3.65 pm/V and 3.43 μm, respectively. The value of second-order nonlinear optical coefficient is comparable to those of BaTiO3 films prepared via metalorganic chemical vapor deposition and pulsed-laser deposition. On the other hand, the glass-ceramic heat-treated for 12 h exhibits d15 = 0.31 pm/V and L = 300 μm. The thickness of the layer active in second-order nonlinearity evaluated from the Maker fringe pattern is coincident with the observation by scanning electron microscopy.

Study On The Second Order Optical Properties Of N-(2,4-Dichloro)-Salicylaldimine

2005 ◽  
Vol 60 (5) ◽  
pp. 376-382 ◽  
Author(s):  
Aslı Karakaş ◽  
Hüseyin Ünver ◽  
Ayhan Elmali ◽  
Ingrid Svoboda
Keyword(s):  
Ab Initio ◽  
Visible Region ◽  
Second Order ◽  
First Hyperpolarizability ◽  
Visible Spectroscopy ◽  
Zero Values ◽  
Ft Ir ◽  
Uv Visible ◽  
Moller Plesset ◽  
Optical Behavior

N-(2,4-Dichloro)-salicylaldimine was synthesized, characterized by elemental analysis, FT-IR, and UV-visible spectroscopy, and its crystal structure was determined. The title compound is almost planar and contains short intramolecular O-H. . .N hydrogen bonds [O1-N1 2.601(1) A° ]. It remains transparent in the visible region and has solvatochromic behavior in the UV region in the range 198 - 349 nm, implying non-zero microscopic first hyperpolarizability. The ab-initio quantum mechanical calculations (finite field second-order Møller Plesset perturbation theory) of the studied compound have been carried out to compute the electric dipole moment (μ) and the first hyperpolarizability (β ) values. The ab-initio results also show that this ligand might have microscopic nonlinear optical behavior with non-zero values.

Cylinder-assisted Maker-fringe technique to probe second-order nonlinearity profiles

2004 ◽  
Author(s):  
Aydogan Ozcan ◽  
Michel J. F. Digonnet ◽  
Gordon S. Kino
Keyword(s):  
Second Order ◽  
Second Order Nonlinearity ◽  
Maker Fringe

Nonlinear Analysis of Visual Evoked Potentials Elicited by Color Stimulation

1997 ◽  
Vol 36 (04/05) ◽  
pp. 315-318 ◽  
Author(s):  
K. Momose ◽  
K. Komiya ◽  
A. Uchiyama
Keyword(s):  
Visual System ◽  
Evoked Potentials ◽  
Visual Evoked Potentials ◽  
Normal Subjects ◽  
Second Order ◽  
First Order ◽  
The Relationship ◽  
Perceived Color ◽  
Second Order Nonlinearity ◽  
Visual Evoked

Abstract:The relationship between chromatically modulated stimuli and visual evoked potentials (VEPs) was considered. VEPs of normal subjects elicited by chromatically modulated stimuli were measured under several color adaptations, and their binary kernels were estimated. Up to the second-order, binary kernels obtained from VEPs were so characteristic that the VEP-chromatic modulation system showed second-order nonlinearity. First-order binary kernels depended on the color of the stimulus and adaptation, whereas second-order kernels showed almost no difference. This result indicates that the waveforms of first-order binary kernels reflect perceived color (hue). This supports the suggestion that kernels of VEPs include color responses, and could be used as a probe with which to examine the color visual system.

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