Intensity threshold in the conversion from reverse saturable absorption to saturable absorption and its application in optical limiting

Deng, Xiaoxu; Zhang, Xueru; Wang, Yuxiao; Ye, Song; Liu, Shutian; Li, Chunfei

doi:10.1016/s0030-4018(99)00297-7

Cited by 41 publications

(25 citation statements)

References 10 publications

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“…Hence, the RSA type of nonlinearity observed here in semiconducting TBO-PVA nanocomposite films at 632.8 nm excitation may primarily be attributed to an ESA process actuated by the population build up in the triplet state [11]. However, the SA type of nonlinearity observed at high intensity (around focus), which occurs after the observation of RSA, may be assigned to the saturation of RSA, as has been reported earlier [22,42]. Herein, the fall of β with I 0 may be the consequence of an ESA assisted RSA process.…”

Section: Resultssupporting

confidence: 74%

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Emission features, surface morphology and optical limiting properties of semiconducting Toluidine Blue O dye-poly(vinyl alcohol) nanocomposite architecture

et al. 2018

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Fabrication of a new nanocomposite architecture comprising small weight percentage (< 0.5 wt%) of Toluidine Blue O dye as a filler in host polymer poly(vinyl alcohol) (PVA) via a simple route based on solution-casting is presented. Their microstructure, electrical, linear optical and third-order nonlinear optical properties are introduced here. These samples were characterized as nanocomposites, with dye chromophore uniformly distributed in the molecular chains of the polymer PVA. The effect of fluorescence quenching due to H-aggregates is also discussed. Low threshold third order nonlinear optical response of these nanocomposite film samples was carried out employing the Z-scan technique. With increase in intensity, a transition from reverse saturable absorption to saturable absorption was observed in the nanocomposite films, on excitation with continuous wave (CW) He-Ne laser light. The nonlinear refraction based optical limiting of CW laser light is demonstrated using aperture limited geometry. Compared with other reported results, the estimated values of the nonlinear refractive index (n 2), nonlinear absorption coefficients (β), third order nonlinear susceptibility (χ (3)) and limiting threshold are much better. These results thus possess tremendous scope towards future fabrication of optoelectronic and photonic devices such as organic/polymer light-emitting devices, dye-sensitized solar cells, optical limiters, optical switches, etc.

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Section: Resultssupporting

confidence: 74%

“…This flip-flop can be explained on the basis of triplet state excitation in detailed using a four-level model (see Fig. 8) [42,43]. The unfilled PVA film yielded no Z-scan signals (see Fig.…”

Section: Resultsmentioning

confidence: 99%

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Emission features, surface morphology and optical limiting properties of semiconducting Toluidine Blue O dye-poly(vinyl alcohol) nanocomposite architecture

et al. 2018

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“…influence of different parameters on the RSA/SA conversion intensity based on a three-level manifold with three consecutive one-photon absorption processes. 18 They demonstrated that, for an RSA/SA switch to occur, the cross-section of the higher lying excited state must be lower than that of the lower lying excited 25 state, which in turn must be larger than that of the ground state absorption cross-section. The switch occurs only when the intensity threshold is reached.…”

Section: Impact Of the Four-level Model Fitting Parameters On The Nonmentioning

confidence: 99%

Solvent effect on the nonlinear absorption of 5,10-A2B2meso substituted porphyrins

Zawadzka

Wang

Blau

et al. 2013

Photochem Photobiol Sci

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The effect of the solvent on the nonlinear absorptive properties of two series of 5,10-A 2 B 2 porphyrins was investigated with an open Z-scan technique in ns time regime. The recorded responses, which varied between compounds and solvents, were fitted with a four-level model where one-photon excited state absorption is followed by a two-photon process arising from the higher excited states. For most of the compounds the positive nonlinear absorption was stronger in toluene than in DMF and chloroform. This 10 was attributed to enhanced two-photon absorption in toluene. For DMF and chloroform the solvent effects were most likely compound specific. It was demonstrated that high saturation intensity of two-photon absorption shifts the RSA/SA turnover into higher fluence range, which is desirable for optical limiting applications. This saturation intensity of two-photon absorption varied between compounds and solvents. Additionally, nonlinear scattering contributed strongly to the open Z-scan responses for many compounds 15 in chlorobenzene and chloroform/chlorobenzene solutions. This was associated with the photodegradation of chlorobenzene.

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“…RSA in porphyrin materials is usually induced by two photon absorption or excited-state absorption [31][32][33][34]. Saturable absorption (SA) as well as switch between SA and RSA are also observed in porphyrins [35,36], which is useful for mode locking, laser pulse compression, and laser amplification [37]. In this article, cyano (CN) and methoxy (OMe) substitutes as the typical acceptor and donor groups are introduced into TPP to synthesize the meso-tetrakis(4-cyano phenyl)porphyrin [TPP(CN) 4 ], and meso-tetrakis(4-methoxyphe nyl)porphyrin [TPP(OMe) 4 ], respectively.…”

Section: Introductionmentioning

confidence: 99%

Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

Qian

Xiao

et al. 2015

Optical Materials

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Intensity threshold in the conversion from reverse saturable absorption to saturable absorption and its application in optical limiting

Cited by 41 publications

References 10 publications

Emission features, surface morphology and optical limiting properties of semiconducting Toluidine Blue O dye-poly(vinyl alcohol) nanocomposite architecture

Emission features, surface morphology and optical limiting properties of semiconducting Toluidine Blue O dye-poly(vinyl alcohol) nanocomposite architecture

Solvent effect on the nonlinear absorption of 5,10-A2B2meso substituted porphyrins

Modulation of internal conversion rate and nonlinear absorption in meso-tetraphenylporphyrins by donor/acceptor substitutes

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