Nonlinear refraction of Coomassie brilliant blue dye in PVA matrix

Valsalamilka, B.; Sreekumar, G.; Muneera, C. I.; Sendhil, Kaladevi; Vijayan, C.

doi:10.1007/s10853-005-6322-9

Cited by 4 publications

(2 citation statements)

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“…Excited state absorption (ESA) and reverse saturable absorption (RSA) are the most common mechanisms for the nonlinear optical behavior of organic materials [11]. Nonlinear optical effects can be employed for the design and performance of optical limiter [12][13][14]. It has been demonstrated that optical limiting can be used for the protection of eyes and sensors from intense lasers [15].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Characterization of Safranin O Dye for Application in Optical Limiting

2011

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The optical nonlinearity of safranin O dye in methanol solution at different concentrations and as a solid film with polymethylmethacrylate (PMMA) has been studied using cw Nd-YAG laser at 532 nm as the source of excitation. The optical responses were characterized by measuring the intensity dependent refractive index (n 2 ) of the medium using the Z-scan technique. The open aperture Z-scan trace of the dye in solution and solid sample displayed saturable absorption. The closed aperture Z-scan trace of the dye exhibited a negative (defocusing) nonlinearity. The nonlinear refractive index was found to vary with concentration. Optical limiting characteristics of the dye at various concentrations in solution were studied. The nonlinearity appears to be of thermal origin.

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Section: Introductionmentioning

confidence: 99%

Nonlinear Characterization of Safranin O Dye for Application in Optical Limiting

2011

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“…It provides not only the magnitudes of the real part and imaginary part of the nonlinear susceptibility, but also the sign of the real part [12]. Both nonlinear refraction and nonlinear absorption in solid and liquid samples can be rapidly measured by the Z-scan technique, which utilizes self-focusing or self-defocusing phenomena in optical nonlinear materials [13][14][15][16]. 976 T. He et al…”

Section: Introductionmentioning

confidence: 99%

Third-order nonlinear response of Ag/methyl orange composite thin films

Cai

et al. 2008

Journal of Modern Optics

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The large third-order nonlinearities of metal nanocluster doped oxide matrix composite films have been investigated widely, but there is very little literature reporting third-order nonlinearity of metal nanoparticle doped azobenzene molecule thin films induced by picosecond laser pulses. This paper has investigated the third-order nonlinearity of colloidal Ag and methyl orange composite films using the Z-scan technique with 38 ps pulses at 532 nm apart from the surface plasma resonance frequency of composite film. Large and negative third-order nonlinearity was observed. The mechanism responsible for the process of nonlinear refraction was discussed in terms of the enhancement of the local field effect, which was confirmed by using the SERS technique. At the end, the figures of merit were evaluated and the results showed that this material would be valuable in the application of all-optical devices.

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