Third - Order Nonlinear Optical Properties and Optical Limiting Behavior of Celestin Blue B Dye Doped Polymer Films

Imad Al-Deen Hussein Ali Al-Saidi

doi:10.11648/j.jmpt.20180401.11

Abstract

Pure Poly (methylmethacrylate) (PMMA) polymer film and Celestin Blue B dye doped polymer films at different concentrations were prepared using casting technique. UV - Vis spectra were recorded to characterize the optical properties of the Celestin Blue B dye doped PMMA polymer films. The magnitudes of both real and imaginary parts of third - order nonlinear susceptibility (χ (3)) of Celestin Blue B dye doped polymer films were determined using the z - scan technique with a continuous wave laser beam at wavelength 532 nm. The nonlinear refractive index (n2) and the nonlinear absorption coefficient (β) of the Celestin Blue B dye doped polymer films were calculated. It was found that the prepared films exhibited saturable absorption (SA) and self - defocusing effect. The optical power limiting behavior also investigated for Celestin Blue B dye doped PMMA polymer films at different concentrations and the optical power limiting threshold values were determined. Results indicate that the Celestin Blue B dye doped PMMA polymer film is a promising material for future photonic device applications.

Highlights

The results showed that the optical and electrical properties of the pure PMMA polymer are significantly affected by introducing the Celestin Blue B organic dye into PMMA polymer
Aperture transmittance is affected by both the nonlinear refraction and absorption, it is necessary to separate the effect of the nonlinear refraction from the nonlinear absorption in order to determine the nonlinear refractive index (n2)
It is obvious from the closed-aperture, the film samples exhibited a transmission peak to valley is indicative of a negative nonlinear refractive index (n2 < 0) due to selfdefocusing effect

Summary

Introduction

Materials with high nonlinear optical (NLO) properties have received much attention recently due to their great potential in many important applications such as, optoelectronic and photonic devices, optical communications, optical signal processing, optical solar cells, optical sensors, light-emitting diodes (LED’s), optical switching, and optical power limiting [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]. It has been found that the intensity of the laser beam can be controlled by using the optical power limiting properties of some nonlinear materials. Several materials have been investigated for their nonlinear optical (NLO) properties, and organic materials such as dyes and polymers have emerged as promising NLO materials [16 - 24]. (methylmethacrylate) (PMMA) polymer, which we have chosen for the present work, is one of the important polymeric materials and it is widely used in various applications for its many advantageous properties such as: Highly light transmission (transparent material), flexible structure, ease of fabrication, good photo-thermal stability, and high damage threshold for the intense laser beams [10, 25, 26], as well as it has a relatively low cost.

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Results

Conclusion