Nonlinear Optical Properties of Organic Photorefractive Polymers

1992 ◽  
Vol 277 ◽  
Author(s):  
W. E. Moerner ◽  
C. A. Walsh ◽  
S. M. Silence ◽  
R. J. Twieg ◽  
T. J. Matray ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Intensity Pattern ◽  
Photorefractive Polymers ◽  
Beam Coupling ◽  
Epoxy Material ◽  
A Charge ◽  
Spatial Phase Shift ◽  
Index Modulation ◽  
Grating Formation

ABSTRACTThis paper describes the photorefractive properties of a new and growing class of materials exhibiting the effect, doped nonlinear organic polymers. We show directly using a PMMA-based copolymer with a pendant nonlinear nitroaminotolane chromophore doped with a charge transport agent that the presence of photoconductivity and optical nonlinearity are only necessary, but not sufficient to guarantee that a given materials system will yield measurable photorefractive gratings, rather than gratings due to some other process such as photochromism. To prove photorefractivity unequivocally, direct measurement of the spatial phase shift between the intensity pattern and the index modulation is best, and we summarize a convenient way to do this using two-beam coupling and sample translation. In addition to the photorefractive epoxy materials such as bisA-NPDA:DEH reported earlier (Phys. Rev. Lett. 66, 1846 (1991); Proc. SPIE1560, 278 (1992)), a new PMMA-based copolymer with pendant p-nitroaniline chromophores doped with DEH also shows photorefractive grating formation, with writing speed 100 times higher than that for the epoxy material.

INORGANIC–ORGANIC HYBRID PHOTOREFRACTIVE MATERIALS BEARING THE BIFUNCTIONAL CHROMOPHORE

2005 ◽  
Vol 14 (04) ◽  
pp. 497-504
Author(s):  
WOONG GI JUN ◽  
HYUK YOON ◽  
SEUNG HWAN LEE ◽  
JAE HONG KIM ◽  
DONG HOON CHOI
Keyword(s):  
Nonlinear Optical ◽  
Sol Gel ◽  
Gain Coefficient ◽  
Side Chain ◽  
Organic Hybrid ◽  
Beam Coupling ◽  
Nonlinear Optical Chromophore ◽  
Photorefractive Materials ◽  
A Charge ◽  
Precursor Molecules

We prepared the photorefractive composite based on organic–inorganic hybrid materials containing charge-transporting molecules, second-order nonlinear optical chromophore, photosensitizer, and plasticizer either as a side chain unit or a guest molecule. New chromophore was synthesized to contain nonlinear optical chromophore and carbazole in one molecule. The functional chromophores were reacted to isocyanatotriethoxysilane to provide the functional precursor molecules. 2,4,7-Trinitrofluorenone (TNF) was added into the sol-gel materials to induce a charge-transfer complex. We also compared the gain coefficient of the photorefractive samples with the change of the concentration of the plasticizer, determined by two-beam coupling technique.

Colloidal semiconductor nanocrystals: synthesis, optical nonlinearity, and related device applications

2021 ◽  
Author(s):  
Min Li ◽  
Cong Wang ◽  
Lude Wang ◽  
Han Zhang
Keyword(s):  
Nonlinear Optical ◽  
Rapid Development ◽  
Semiconductor Nanocrystals ◽  
Optical Nonlinearity ◽  
Photonic Devices ◽  
Nlo Properties ◽  
Novel Materials ◽  
Colloidal Semiconductor Nanocrystals ◽  
Device Applications ◽  
Colloidal Semiconductor

The rapid development of photonic devices requires the exploration of novel materials with superior nonlinear optical (NLO) properties. Colloidal semiconductor nanocrystals (NCs) exhibit size-tunable exciton resonances and excellent NLO properties....

scholarly journals Tunable Nonlinear Optical Property of MnS Nanoparticles with Different Size and Crystal Form

Nanomaterials ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 34
Author(s):  
Zhihao Zhang ◽  
Pengchao Li ◽  
Yuzong Gu
Keyword(s):  
Optical Property ◽  
Nonlinear Optical ◽  
Nonlinear Optical Property ◽  
Nonlinear Refraction ◽  
Synthesis Method ◽  
Crystal Form ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Third Order ◽  
Crystal Forms

It is significant to study the reason that semiconductor material has adjustable third-order optical nonlinearity through crystal form and dimensions are changed. αMnS nanoparticles with different crystal forms and sizes were successfully prepared by one-step hydrothermal synthesis method and their size-limited third-order nonlinear optical property was tested by Z-scan technique with 30 ps laser pulses at 532 nm wavelength. Nanoparticles of different crystal forms exhibited different NLO (nonlinear optical) responses. γMnS had stronger NLO response than αMnS because of higher fluorescence quantum yield. Two-photon absorption and the nonlinear refraction are enhanced as size of nanoparticlesreduced. The nanoparticles had maximum NLO susceptibility which was 3.09 × 10−12 esu. Susceptibility of αMnS increased about nine times than that of largest nanoparticles. However, it was reduced when size was further decreased. This trend was explained by the effects of light induced dipole moments. And defects in αMnS nanoparticles also had effect on this nonlinear process. MnS nanoparticles had potential application value in optical limiting and optical modulation.

Photorefractive Materials

MRS Bulletin ◽  
1994 ◽  
Vol 19 (3) ◽  
pp. 29-31 ◽  
Author(s):  
F. Agulló-López
Keyword(s):  
Electric Fields ◽  
Communication Technologies ◽  
Third Order ◽  
Nonlinear Materials ◽  
Light Pattern ◽  
Alternating Electric Fields ◽  
Beam Coupling ◽  
Photorefractive Materials ◽  
A Charge ◽  
Electrooptic Devices

There is a growing demand for nonlinear optical materials for a variety of applications—lasers and coherent sources, electrooptic devices, communication technologies, and optical processors and computers. Nonlinear optics is a vast field requiring materials with diverse performance features. Photorefractive (PR) materials, which experience a change in the refractive index under the effect of inhomogeneous illumination, constitute a relevant branch of the field. They behave as third-order nonlinear materials, which can be considered, in general, as photorefractive. However, the materials more commonly designated as photorefractives involve a charge-transport-induced nonlinearity, and it is these materials which are the object of this issue of the MRS Bulletin.At variance with conventional (often designated as Kerr) nonlinear materials, photorefractives are sensitive not to the local light intensity but to its spatial variation; i.e., they are nonlocal materials. This feature makes them more complicated to deal with than their conventional counterparts, since a χ(3) susceptibility cannot be properly defined (except as a k-dependent function). On the other hand, this sensitivity gives them some unique and interesting features. In particular, an interference light pattern illuminating the crystal and the generated index grating are phase-shifted, leading to remarkable beam coupling and amplification effects. The coupling gain can be markedly enhanced by applying alternating electric fields or by oscillating the interference fringes with a piezoelectric mirror. Efficient image amplifiers have been made using this effect.

scholarly journals Нелинейное поглощение растворов метиленового голубого в присутствии плазмонных наночастиц с различным поверхностным зарядом

2020 ◽  
Vol 128 (9) ◽  
pp. 1380
Author(s):  
А.П. Русинов ◽  
М.Г. Кучеренко
Keyword(s):  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Mathematical Models ◽  
Surface Charge ◽  
Light Absorption ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Dye Molecules ◽  
Gold And Silver Nanoparticles

By continuous-pump Z-scanning, the nonlinear light absorption of aqueous and alcohol solutions of methylene blue was studied. It was shown that the mechanisms of optical nonlinearity of these solutions vary depending on the dye concentration and type of solvent. The dependence of the amplitude of nonlinear absorption of dye molecules on the concentration and sign of the surface charge of gold and silver nanoparticles in solution is revealed. Mathematical models of optical nonlinearity for concentrated and diluted solutions of dye molecules are considered; in the latter case, the influence of plasmon nanoparticles on the nonlinear optical characteristics of methylene blue solutions is taken into account

Ethylenediamine-modified graphene oxide covalently functionalized with a tetracarboxylic Zn(ii) phthalocyanine hybrid for enhanced nonlinear optical properties

2016 ◽  
Vol 15 (7) ◽  
pp. 910-919 ◽  
Author(s):  
Zongle Li ◽  
Chunying He ◽  
Zhao Wang ◽  
Yachen Gao ◽  
Yongli Dong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Graphene Oxide ◽  
Nonlinear Optical ◽  
Optical Nonlinearity ◽  
Nonlinear Optical Properties ◽  
Modified Graphene Oxide ◽  
Modified Graphene

An investigation of the enhanced optical nonlinearity of ethylenediamine-modified graphene oxide covalently functionalized with a tetracarboxylic Zn(ii) phthalocyanine.

The Photorefractive Effect in Monolithic Structural Polyimides

2000 ◽  
Vol 12 (1) ◽  
pp. 205-212 ◽  
Author(s):  
Cheolsoo Jung ◽  
Tetsuya Aoyama ◽  
Tatsuo Wada ◽  
Hiroyuki Sasabe ◽  
Mitsutoshi Jikei ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Nonlinear Optical ◽  
Photorefractive Effect ◽  
Beam Coupling ◽  
Space Charge Distribution ◽  
Photorefractive Materials ◽  
Loading Ratio ◽  
Corona Poling ◽  
Sufficient Space ◽  
Ethylene Group

We report here the photorefractive effect in monolithic structural polyimides containing the triphenylamino-( p-nitrophenyl)-ethylene group as a nonlinear optical (NLO) chromophore and hole transfer. Three types of polyimides were synthesized to control the loading ratio of the NLO chromophore; 50, 30 and 17 mol% for polyimides 1, 2 and 3 respectively. In the two-beam coupling experiment, asymmetric energy transfer was observed in the case of polyimides 1 and 2, providing evidence for a phaseshifted grating after corona-poling treatment, whereas the energy transfer of polyimide 3 was not observed. This result denotes that the NLO chromophore plays an important role in monolithic photorefractive materials, and a greater than 30 mol% concentration of NLO chromophore is required for creating sufficient space charge distribution.

scholarly journals Photoconductive Multiplexing by ZnO:Zr:F Thin Solid Films

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
C. Torres-Torres ◽  
L. Castañeda ◽  
R. Torres-Martínez
Keyword(s):  
Nonlinear Optical ◽  
Laser System ◽  
Optical Nonlinearity ◽  
Spectroscopic Studies ◽  
Photon Absorption ◽  
Zno Films ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Two Wave Mixing ◽  
Mixing Method

Within this work, the nonlinear optical properties and electrical effects exhibited by zinc oxide thin films codoped with zirconium and fluorine are reported. The development of a simple photoconductive multiplexor system is proposed. The samples were prepared by the ultrasonic spraying technique (UST). Spectroscopic studies and a vectorial two-wave mixing method were carried out with a nanosecond Nd:YAG laser system at 532 nm. Experimental results indicate that after the zirconium and fluorine doping, a strong third-order optical nonlinearity can be developed in the ZnO films. The nonlinear optical response seems to be dominantly originated by a two-photon absorption closely related to a photoconductive phenomenon.

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