Optical and Photothermal Behaviors of Colloidal and Self-Assembled Magnetic-Plasmonic Nanostructures

K. Liu, X. Xue, V. Sukhotskiy, E.P. Furlani
University at Buffalo,
United States

Keywords: localized surface plasmon resonance (LSPR), magnetic-plasmonic nanostructures, photothermal energy conversion, LSPR-induced optical absorption, photothermal therapy, biosensor


We present a consecutive theoretical study on the optical and photothermal properties of colloidal hybrid nanotrustures. Firstly, we explore the absorption spectra and local field distribution of SiO2@Au core-shell particles, Au nanocages and Au nanorods which have critical applications in biomedical theranostics. This research identifies the advantagous properties of these nanostructures in relevant near-infrared applications. Secondly, we develop a novel bottom-up method for the fabrication of magnetic-plasmonic core-shell nanoparticles and demonstrate this cost-effective self-assembly method. Additionally, we investigate two different Fe3O4@Au particle assemblies: heptamer particle structures and 1D particle chains. Absorption spectra and field enhancement are explored on these two assemblies to demonstrate their applications in biosensors and photothermal applications.