Nonlinear Optical Absorption Properties of Two Multisubstituted p-Dimethylaminophenylethenyl Pyridiniums

Abstract

Two multisubstituted D-pi-A type pyridinium salts, N-methyl-2,6-di[(E)-p-dimethylaminophenylethenyl]pyridinium iodide (1) and N-methyl-2,4,6-tri[(E)-p-dimethylaminophenylethenyl]pyridinium iodide (2), were synthesized with good yields by a modified method, and the structure of 1 was confirmed by X-ray diffraction. The nonlinear optical absorption (NOA) properties of the two compounds in the solution state were investigated by the Z-scan technique. Compounds 1 and 2 both exhibited very strong saturated absorption at picosecond pulse, and 1 displayed reverse saturated absorption, while 2 revealed saturated absorption properties at the nanosecond pulse. The electron-donating ability, number of side chains, and molecular coplanar characteristics of the compounds have a significant impact on their NOA properties.

Investigations on crystal growth, structural, optical, dielectric, mechanical and thermal properties of a novel optical crystal: Nicotinium nitrate monohydrate

“…The Z-scan measurements indicate that NNM exhibits negative nonlinear optical properties. It is worth noting that the value of nonlinear susceptibility (w (3) ) for NNM is larger than those of some representative third-order nonlinear optical materials [20,21].…”

“…Table 2 depicts the nonlinear parameters, nonlinear refractive index (n 2 ), change in refractive index (Dn), nonlinear absorption coefficient (b) and nonlinear susceptibility (w (3) ) of NNM using the Z-scan technique with 632.8 nm He-Ne laser. As the nonlinear refractive index of NNM has a negative sign, it results in selfdefocusing nature of the material, which is an essential property for its application in the protection of optical sensors such as night-vision devices [18].…”

“…Nonlinear optical absorption (NOA) has shown its potential application in optical information storage, all optical logic gates, laser radiation protection and in the locked laser mode. Interest in the searching for NOA materials gradually increased [3]. This paper deals with the growth and physiochemical studies on third-order nonlinear optical nicotinium nitrate monohydrate (NNM) crystals.…”

Harmonic Generation Analyses of Memristor with Different Barriers and Neuron

“…Hence the researches about this field have increased gradually [1]. Second harmonic generation (SHG) is a nonlinear optical process that is named as "frequency doubling".…”

Nonlinear optical and laser damage threshold studies of an ammonium p-toluenesulfonate crystal

“…Materials with third-order nonlinear optical (NLO) property, i.e., nonlinear refraction (NLR) and nonlinear absorption (NLA), are preferred for all optical switching and sensor protection applications [1][2][3][4][5]. For the past few years, an investigation in finding the new organic NLO materials is triggered.…”