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

Abstract

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.

Polarization Z-Scan Studies Revealing Plasmon Coupling Enhancement Due to Dimer Formation of Gold Nanoparticles in Nematic Liquid Crystals

“…Polarization z-scan allows for a comprehensive analysis of the material's anisotropic properties, revealing how nonlinear optical behavior changes with different polarizations [35][36][37][38][39][40][41]. In this report, we used the polarization z-scan technique to probe the interparticle plasmon coupling within AuNP dimers as well as establish their presence and structural characteristics.…”