Studies on Fluorescence Efficiency and Photodegradation of Rhodamine 6G Doped PMMA Using a Dual Beam Thermal Lens Technique

Kurian, Achamma; George, Nibu A.; Paul, Binoy; Nampoori, V. P. N.; Vallabhan, C. P. G.

doi:10.1080/02786270215153

Cited by 82 publications

(43 citation statements)

References 25 publications

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“…Experimentally determined nonlinear refractive index n2 and nonlinear absorption coefficient β can be used in finding the real and imaginary parts of the third-order nonlinear optical susceptibility [χ 3 ] according to the following: [15] Re χ (3) (13) Where ɛ0 is the vacuum permittivity, and c is the light velocity in vacuum. [16] The absolute value of the third-order nonlinear optical susceptibility is given by the relation:…”

Section: Resultsmentioning

confidence: 99%

“…(2b) includes the effect of both nonlinear refraction and nonlinear absorption, if any, the division of the normalized closed aperture Z-scan data by the open aperture Z-scan data generates a Z-scan profile pertaining to the purely dispersive (refractive) nonlinearity [9]. Z-scan method provides a direct measurement of the real and imaginary parts of the thirdorder nonlinear optical susceptibility χ (3). .…”

Section: Samples Preperationmentioning

confidence: 99%

“…Dye doped polymers find applications in the fields of modern photonic technology apart from its use as an alternative to solid state laser media. [3].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Characterization of Rhodamine 610 dye-doped PMMA Thin Films Under 650 nm CW Laser Light Excitation

Jaffar¹

2017

JNUS

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In this work the nonlinear optical properties for Rodamine 610 (R610) in PMMA doped films with different concentrations with the solvent Chloroform by using a high sensitive method known as Z-Scan technique were studied.Z-scan experiment was performed using CW diode laser at 650 nm with the power output of 45 mW, in two parts. The first part was done using a closed-aperture placed in front of the detector to measure the nonlinear refractive index. In the second part; the aperture in front the detector was removed (open aperture) to measure the nonlinear absorption coefficient. The experimental results for closed aperture show that the dye doped films exhibit negative refractive index (self_defocusing) for the films of concentration 10 -5 and 10 -4 M, while the film of concentration 10 -6 M exhibits positive refractive index (self-focusing), The results show also that the nonlinear refractive index and the third order nonlinear susceptibility increased with the increasing of the concentration due to the increasing of the film thickness which caused increasing the nonlinear phase shift in the samples. With open aperture z-scan the samples exhibit two photon absorption under the experimental conditions. The effective values of the nonlinear refractive index n2, the nonlinear absorption coefficient β, real and imaginary parts of the third-order optical nonlinearity, χ (3) were evaluated. The results imply that R610 films can be used as a potential medium for various optoelectronic applications including that in optical power limiting.

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Section: Resultsmentioning

confidence: 99%

Section: Samples Preperationmentioning

confidence: 99%

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Nonlinear Characterization of Rhodamine 610 dye-doped PMMA Thin Films Under 650 nm CW Laser Light Excitation

Jaffar¹

2017

JNUS

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“…Care is taken to see that the dye is homogeneously distributed in the polymer matrix. After 24 h, the completely polymerized sample is removed from the water bath [13]. A spot casting method is used to prepare the samples in which the dye-doped polymer mixture drops are placed on clean microscopic glass slides to form thin coatings of the sample.…”

Section: Preparation Of Dye-doped Polymer Samplesmentioning

confidence: 99%

“…These methods have the additional advantage of being much less sensitive to the light scattered by surface roughness and volume inhomogeneties. The photoacoustic (PA) technique has already been used by many researchers to study the energy transfer mechanisms in a number of dye systems [12,13].…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic study on the photostability of polymethyl methacrylate films doped with Rhodamine 6G–Rhodamine B dye mixture system

K¹,

Joseph²,

Irimpan³

et al. 2005

J. Phys. D: Appl. Phys.

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The photosensitivity of dye mixture-doped polymethyl methacrylate (PMMA) films are investigated as a function of laser power, concentration of the dyes, modulation frequency and the irradiation wavelength. Energy transfer from a donor molecule to an acceptor molecule affects the emission output of the dye mixture system. Photosensitivity is found to change with changes in donor-acceptor concentrations. PMMA samples doped with the dye mixture are found to be more photosensitive when the dyes are mixed in the same proportion.

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Diatom percolation through soils: a proof of concept laboratory experiment

et al. 2015

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Diatoms are unicellular eukaryotic algae that are widely distributed in aquatic environments. In particular, their presence is abundant in stream flows, whereas the instance and transport of cells through subsurface flow is controversial. In this work, we study the transport of diatoms through soils by designing laboratory percolation experiments on undisturbed loamy and sandy soil cores. To label diatom tracers and enhance their detectability, we develop protocols to functionalize frustules of purified diatomite and Conticribra weissflogii cultures with rhodamine 123 and 2‐(4‐pyridyl)‐5[4‐dimethylaminoethyl‐aminocarbamoyl)‐methoxy]phenyloxazole, respectively. Labelled diatoms demonstrate good detectability and resilience under weathering agents. We execute percolation experiments for maximum time domains of approximately 600 min where volumes of water up to 3600 ml are deployed on the soil core surface. Under such experimental conditions, fluorescent diatoms are not recovered in samples of percolated material as per microscopy and spectrofluorometry. While further field studies are needed to fully investigate diatom transport, our findings shed new light on the potential of using biotic tracers for surface hydrological processes. Copyright © 2015 John Wiley & Sons, Ltd.

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Studies on Fluorescence Efficiency and Photodegradation of Rhodamine 6G Doped PMMA Using a Dual Beam Thermal Lens Technique

Cited by 82 publications

References 25 publications

Nonlinear Characterization of Rhodamine 610 dye-doped PMMA Thin Films Under 650 nm CW Laser Light Excitation

Nonlinear Characterization of Rhodamine 610 dye-doped PMMA Thin Films Under 650 nm CW Laser Light Excitation

Photoacoustic study on the photostability of polymethyl methacrylate films doped with Rhodamine 6G–Rhodamine B dye mixture system

Diatom percolation through soils: a proof of concept laboratory experiment

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