Optical Waveguiding in Poled NLO Polymers

1991 ◽  
Vol 228 ◽  
Author(s):  
J. D. Swalen ◽  
W. Fleming ◽  
M. Jurich ◽  
W. E. Moerner ◽  
B. A. Smith ◽  
...  
Keyword(s):  
Thin Film ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Spectral Response ◽  
Polymeric Thin Films ◽  
Epoxy Polymers ◽  
Phase Modulators ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores ◽  
Optical Waveguiding

ABSTRACTFor potential optoelectronic applications, new polymeric thin films containing nonlinear optical chromophores aligned by electric field poling for a χ(2) nonlinear optical response have been prepared and studied. Spectroscopic and optical waveguiding techniques, as well as second harmonic generation and electrooptic measurements, are being used to characterize these thin film materials. Here we optimize the chromophores in spectral response, nonlinearity, concentration and degree of alignment. Stability in the nonlinearity has been improved considerably by attaching the chromophores to crosslinked epoxy polymers. Some applications of these materials for electrooptic phase modulators will be presented.

Synthesis and Characterization of Aromatic Polyimides Bearing Nonlinear Optical Chromophores

2000 ◽  
Vol 12 (1) ◽  
pp. 169-176 ◽  
Author(s):  
L Bes ◽  
A Rousseau ◽  
B Boutevin ◽  
R Mercier ◽  
B Sillion ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Uv Spectroscopy ◽  
Harmonic Coefficient ◽  
Aromatic Polyimides ◽  
Relaxation Temperature ◽  
Thermal Imidization ◽  
Nonlinear Optical Chromophores ◽  
Hydroxy Groups ◽  
Optical Chromophores

The syntheses and characterizations of two aromatic polyimides with nonlinear optical (NLO) chromophore side chains were investigated through a two-step synthetic route. These two polymers were prepared by polycondensation of 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) with 4-(4-amino, 2-hydroxy) phenoxyaniline (HODA) and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (6FAP), respectively. First the poly(hydroxy)imides were prepared by direct thermal imidization. The resulting polyimides bearing hydroxy groups were found to react easily with the terminal hydroxy group of the chromophore (Disperse Red1 (DR1)) via the Mitsunobu reaction. The high content of chromophore for the polyimide with 6FAP diamine was confirmed by UV spectroscopy and ellipsometry spectroscopy measures. The resulting NLO polyimides possess high glass transition temperatures ( Tg > 185°C), excellent solubilities and processabilities even though the extent of chromophore grafting is up to 95 mol%. The second harmonic coefficient ( d33) at the wavelength of 1320 nm is close to 30 pm V−1. The thermal and temporal stabilities of the NLO properties were investigated. The relaxation temperature of the SHG signal measured at the 50% decay of the initial SHG signal ( I 2ω/2 at 2°C min−1) was 168°C for the polyimide based on HODA and 157°C for the polyimide based on 6FAP.

Preparation and Second-Harmonic Generation Properties of a Self-Assembled Multilayer Film Based on Nanoporous Isopolyoxomolybdate and Bipolar Hemicyanine

2008 ◽  
Vol 8 (3) ◽  
pp. 1355-1358 ◽  
Author(s):  
Li-Hua Gao ◽  
Xiao-Juan Hu ◽  
De-Sheng Zheng ◽  
Yuan Guo ◽  
Ke-Zhi Wang
Keyword(s):  
Second Harmonic Generation ◽  
Film Thickness ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Multilayer Film ◽  
Second Harmonic ◽  
Square Roots ◽  
Self Assembled ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

An electrostatic self-assembled multilayer film has successfully been prepared by alternating adsorption of a wheel-shaped nanoporous isopolyoxomolybdate and a bipolar hemicyanine derivative, as monitored by absorption spectroscopy. The square roots of second-harmonic intensities of the film exhibit quadratic dependence on film thickness up to 10 layers. The average titled angle of the nonlinear optical chromophores to the substrate normal is derived to be 34° by polarized second-harmonic generation measurements.

SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF CHROMOPHORE-COATED PARTICLES: SYMMETRY CONSIDERATIONS

2007 ◽  
Vol 16 (01) ◽  
pp. 27-35 ◽  
Author(s):  
KASPER BAERT ◽  
KURT WOSTYN ◽  
RENAUD A. L. VALLÉE ◽  
KOEN CLAYS
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Rayleigh Scattering ◽  
Second Harmonic ◽  
Nonlinear Effects ◽  
Second Order ◽  
Nonlinear Optical Properties ◽  
Harmonic Intensity ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

The second-order nonlinear optical properties of polystyrene particles coated with two well-characterized nonlinear optical chromophores with different molecular symmetry have been studied. From the markedly different depolarization ratio for the hyper-Rayleigh scattering from the molecular scatterers and from the largely different second-harmonic intensity from particles coated with these chromophores, we conjecture that contributions from antisymmetric molecular electronic states are necessary to observe second-order nonlinear effects from centrosymmetrical particles in isotropic solution.

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