Nonlinear refractive index of dye-doped organic polymers

Planas, Susana A.; Duarte, Adriana da Silva Santos; Mazzali, C.; Palange, E.; Fragnito, H.L.; Cardoso, V. L.; Sanches, Mariangela P. R.; Villani, M.; Reggiani, Atilio Eduardo

doi:10.1117/12.165275

Cited by 6 publications

(7 citation statements)

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“…12,48,50 However, if the nonlinearity of these samples is due to TPA, a negative n 2 should be obtained when the absorption wavelength maximum is shorter than the two-photon resonance condition of the laser (532 nm in present study, half of the 1064 nm used in the experiment). 25 A positive n 2 in the mesostructured film is consistent with the two-level model for third-order electronic nonlinearity, while in the nonmesostructured film, a negative n 2 indicates that the two-photon resonance is dominant over the contribution of electronic nonlinearity. The different mechanisms for third-order nonlinearity lead to a self-focusing process in mesostructured films and a self-defocusing process in nonmesostructured films, respectively.…”

Section: Resultssupporting

confidence: 62%

“…The literature, where the nonlinear refractive indexes of DR1 in PMMA 25 and poly(maleic anhydride-co-octadecene) 22 were measured to be at the magnitude of 10 -17 and 10 -19 m 2 /w at 1064 nm, emphasized the contribution of TPA resonance enhancement to the nonlinearity. Similar contributions of TPA are also present in the nonmesostructured films.…”

Section: Resultsmentioning

confidence: 99%

“…The NLO of azobenzene chromophore physically and/or chemically loaded in organic and inorganic polymeric matrices has been widely studied. 1,[21][22][23][24][25][26][27][28] Nevertheless, as mentioned above, few samples satisfy the figures of merit for alloptical applications even with large nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

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Azo Chromophore Monomerically Bonded Mesostructured Silica Films with Large Third-Order Nonlinearity but Negligible Nonlinear Absorption

Shi

Wei

et al. 2008

J. Phys. Chem. C

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The azobenzene chromophore covalently and monomerically dispersed mesostructured organic-inorganic hybrid films were prepared by a direct-synthesis route thanks to the compatible environment provided by the hydrophobic core of the surfactant micelles. The third-order optical nonlinearity of this mesostructured organic-inorganic hybrid was investigated by using the Z-scan technique in/near the two-photon absorption region (at 1064 nm). It is very interesting that no two-photon absorption could be detected in/near the twophoton absorption region, which is in contrast to those in solution and common nonmesostructured films. Meanwhile, a large nonlinearity with a nonlinear refractive index n 2 of 10 -9 esu, purely attributed to electronic effect, has been obtained. The special structure, that the hydrophilic alkoxysilane end is covalently anchored on the silica pore surface while the opposite hydrophobic chromophore end is monomerically dispersed in mesopore space, is believed to be responsible for the uncommon nonlinear optical properties. As a result, the special nonlinear optical properties of such mesostructured films can well satisfy the Stegmen figures of merit for the demands of all-optical devices applications.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

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Azo Chromophore Monomerically Bonded Mesostructured Silica Films with Large Third-Order Nonlinearity but Negligible Nonlinear Absorption

Shi

Wei

et al. 2008

J. Phys. Chem. C

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“…A peak-valley shape presents the negative nonlinear refractive index and a self-defocusing propagation of the laser light in such hybrid film. The nonlinear refractive index n 2 can be estimated to be À3.05 Â 10 À15 m 2 /W, i.e., À1.13 Â 10 À8 esu, more than one magnitude higher than that of the disperse red 1 azobenzene chromophore doped side-chain silica hybrid film [15] and other azobenzene chromophore solutions or polymer-based composites at 1064 nm [23][24][25], which may be attributed to the enlarged p-electron conjugation due to the linked diazobenzene chromophore, as well as the large TPA cross-section.…”

Section: Resultsmentioning

confidence: 99%

Diazobenzene chromophore-doped silica films with large two-photon absorption cross-section

Shi

Qian

et al. 2009

Dyes and Pigments

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“…It is worth noting that the value of γ is larger than those of some representative third-order nonlinear optical materials such as azobenzene-doped polymer and organic metal [18], which indicates that the azobenzene side-chain polymer has a potential application in nonlinear optical devices.…”

Section: Original Papermentioning

confidence: 99%

Third‐order optical nonlinearity of azobenzene side‐chain polymer thin film

He¹,

Cheng²,

Wang³

et al. 2007

Physica Status Solidi (b)

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This paper reports both the nonlinear refractive index and nonlinear absorption coefficient of an azobenzene side-chain polymer measured by a single-beam Z-scan technique under 532 nm and 1064 nm excitation. Experimental results at 532 nm excitation show large optical nonlinearity and nonlinear absorption coefficient induced by the trans -cis transition in the dye molecule with γ being -9.46 × 10 -12 cm 2 /W with β = -285.29 cm/GW, respectively. Under 1064 nm excitation, the large nonlinearity induced by the nonresonant electronic effect with γ = 4.57 × 10 -12 cm 2 /W is obtained.

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Nonlinear refractive index of dye-doped organic polymers

Cited by 6 publications

References 0 publications

Azo Chromophore Monomerically Bonded Mesostructured Silica Films with Large Third-Order Nonlinearity but Negligible Nonlinear Absorption

Azo Chromophore Monomerically Bonded Mesostructured Silica Films with Large Third-Order Nonlinearity but Negligible Nonlinear Absorption

Diazobenzene chromophore-doped silica films with large two-photon absorption cross-section

Third‐order optical nonlinearity of azobenzene side‐chain polymer thin film

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