Ponente
Descripción
The integration of plasmonic nanoparticles with nonlinear signal processing offers new opportunities for enhancing the sensitivity of optical and biomedical sensing systems. Here, we report a chaotic optoelectronic method for detecting plasmonic and photothermal effects in Au nanoparticles embedded in TiO₂ thin films and coupled to biological cell interfaces. Au nanoparticles were synthesized in situ within TiO₂ films using a sol–gel process, while their optical and electrical responses were evaluated under nanosecond pulsed laser excitation at 532 nm. A Rössler attractor-based electronic circuit was employed as a nonlinear sensing platform to monitor changes in the sample conductivity induced by localized surface plasmon resonance excitation and laser-driven thermal effects. The experimental results indicate that optical irradiation modifies the plasmonic absorption band and promotes measurable changes in the electrical response of the nanostructured system. These changes were clearly reflected in the evolution of the chaotic attractor, demonstrating that chaotic modulation can improve the detection of subtle optoelectronic variations in complex nanoparticle–cell environments. In addition, the observed response suggests that thermoplasmonic energy transfer and controlled optical damage mechanisms can be selectively evaluated through nonlinear electronic signatures. The proposed methodology highlights the potential of combining Au-based plasmonic nanostructures, pulsed laser irradiation, and chaotic dynamics for the design of advanced sensors with applications in biomedical diagnostics, photothermal therapy, and optically controlled biointerfaces.
Keywords: Au nanoparticles; plasmonic sensing; chaotic dynamics; Rössler system; photothermal response; optoelectronic sensors; biological interfaces.
