Optical bistability in Coumarin-450 doped polymeric samples

Purnima, .; Mohan, Devendra; Gill, Karan Singh

doi:10.1016/j.ijleo.2011.06.056

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…DCM (MW 303.37, Exciton) dye is embedded in PMMA matrix following the polarization scheme detailed elsewhere [31]. Visually transparent DCM/PMMA discs (molar concentration 1.00 mM) with a thickness of ∼2 mm and diameter ∼12 mm are obtained after cutting and polishing.…”

Section: Methodsmentioning

confidence: 99%

Polarization-dependent Z-scan characterization for optical nonlinearity in pyran dye

Purnima¹,

Mohan²,

Dhar³

2013

Laser Phys.

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Polarization-dependent Z-scan characterization is made for DCM (4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran) dye encapsulated in a polymer matrix (DCM/PMMA). A continuous wave Ar + laser beam operating at ∼514 nm wavelength is employed as the source. The normalized transmittance for a linear, elliptical and circular polarization state of incident light with corresponding nonlinear refractive and nonlinear absorptive changes is studied. Intensity-dependent change in the refractive index ( n) and change in the absorption coefficient ( β) with photoisomerization as well as two independent tensor components χ 3 xxyy and χ 3 xyyx of third order susceptibility (χ 3 ) are reported. It is observed that nonresonant electronic nonlinearities dominate to give rise to an optical nonlinear response that can be exploited for use as optical switching.

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Section: Methodsmentioning

confidence: 99%

Polarization-dependent Z-scan characterization for optical nonlinearity in pyran dye

Purnima¹,

Mohan²,

Dhar³

2013

Laser Phys.

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Optical bistable switching in pyran dye-doped polymers

Purnima

Mohan

2014

J. Nonlinear Optic. Phys. Mat.

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In the present frame of work, optical bistability using a Fabry–Perot (FP) cavity containing 4-dicyanomethylene-2-methyl-6-p-dimethylaminostyryl-4H-pyran (DCM) dye entrapped in poly-methylmethacrylate (PMMA) matrix is experimentally investigated. Optical nonlinear behavior of solid-state samples is studied using a single-mode Q-switched nanosecond Nd:YAG laser operating at 532 nm. Various optical nonlinear parameters such as nonlinear refractive index (n2) and third-order susceptibility (χ3) of the material are numerically estimated from bistability loops. The origin of optically bistable behavior is attributed to photoisomerization-assisted nonlinear refraction phenomenon. It is observed that nonlinear refraction dominates over nonlinear absorption in giving rise to the optical bistability. The study shows that DCM dye entrapped in solid-state matrices are promising candidate for polymer-based optical switches, data processing, and communication systems.

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Optical bistability in Coumarin-450 doped polymeric samples

Cited by 2 publications

References 18 publications

Polarization-dependent Z-scan characterization for optical nonlinearity in pyran dye

Polarization-dependent Z-scan characterization for optical nonlinearity in pyran dye

Optical bistable switching in pyran dye-doped polymers

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