A fractional description for the optically induced mechanisms responsible for conductivity and multiphotonic effects in ZnO nanomaterials is studied here. Photoconductive, electrical, and nonlinear optical phenomena exhibited by pure micro and nanostructured ZnO samples were analyzed. A hydrothermal approach was used to synthetize ZnO micro-sized crystals, while a spray pyrolysis technique was employed to prepare ZnO nanostructures. A contrast in the fractional electrical behavior and photoconductivity was identified for the samples studied. A positive nonlinear refractive index was measured on the nanoscale sample using the z-scan technique, which endows it with a dominant real part for the third-order optical nonlinearity. The absence of nonlinear optical absorption, along with a strong optical Kerr effect in the ZnO nanostructures, shows favorable perspectives for their potential use in the development of all-optical switching devices. Fractional models for predicting electronic and nonlinear interactions in nanosystems could pave the way for the development of optoelectronic circuits and ultrafast functions controlled by ZnO photo technology.

Simultaneous interrogation of pump and probe beams interacting in ZnO nanostructures of a two-wave mixing is proposed for dual-path data processing of optical signals by nonlinear optical effects. An enhancement in third-order nonlinear optical properties was exhibited by Al-doped ZnO thin films. Multiphoton absorption and nonlinear refraction were explored by the z-scan technique at 532 nm with nanosecond pulses. The evolution of the optical Kerr effect in the ZnO thin films was analyzed as a function of the incorporation of Al in the sample by a vectorial two-wave mixing method. Electrical and photoconductive effects were evaluated to further characterize the influence of Al in the ZnO solid samples. Potential applications of nonlinear optical parameters for encoding and encrypting information in light can be envisioned.

Polypyrrole (PPy) synthesized via plasma polymerization (PPPy) offers a unique combination of electrical conductivity, biocompatibility and stability. This advanced material has emerged as a promising platform for next-generation optoelectronics and multiphotonic biosensors. However, fully unlocking its potential has been hindered by processing challenges that restrict the fabrication of tailored specimens for precise optical and mechanical characterization. This work overcomes these limitations by isolating and analyzing the nonlinear optical (NLO) response of PPPy across three distinct architectural paradigms: Electrospinning, Coating on SiO₂ Slides, and Dust of Polymer. Using open- and closed-aperture Z-scan techniques, we demonstrate that PPPy exhibits highly pronounced, architecture-dependent NLO behaviors. Notably, the Electrospinning PPPy morphology triggered a full order-of-magnitude enhancement in the nonlinear refractive index (n₂) alongside low-threshold nonlinear absorption (β × 10⁻⁸ cm/W). Irradiance-dependent properties further revealed an optical anisotropy, directly governed by the structural and morphological orientation inherent to each processing method. Since optical nonlinearities are closely related to mechanical and electronic properties, these findings provide a critical blueprint for developing macromolecular architectures, opening new pathways for biocompatible cutting-edge multiphotonic platforms, innovative coatings and surface modifications for tailored implants.