Investigation of Plasmonic Properties of Egg-like Multilayer Structures

In this work, the plasmonic properties of magnetic and liquid nanoparticles coated with aluminium are studied for egg-like/multilayer structures. The optical spectra of multilayers nanoparticles under core-shell or bi-layer (Fe/FeO/Fe2O3/Fe3O4@Al, Cs/Cs2O@Al) and egg-like or multilayer (Fe/FeO/Fe2O3/Fe3O4@Cs/Cs2O@Al) nanostructures are theoretically investigated. Variations in materials types and size parameters including inner core, shell, and outer shell have shown their significant influence on enhancement in LSPR peak position, intensity, and broadening. It is observed that the LSPR peak position effectively increased with pure materials and the peak's intensity along with line-width or broadening increased with oxide materials in core-shell configuration. In an egg-like/multilayer configuration, varying sizes of oxide materials in the core, as well as shell, have their direct impact on line-width as well as the intensity of peaks. It is found that the LSPR peaks get red-shifted with increasing core size and blue-shifted with increasing shell thickness and enhanced spectra are seen for Fe2O3-core with varying Al-shell thickness. The plasmonic LSPR peaks at lambda(max) are revealed in the range of 221-1004 nm wavelengths and tuned in the deep UV-visible-NIR region of core-shell and visible region of egg-like (multilayer) nanostructures. Such response of core-shell and egg-like/multilayer nanostructures for optical-absorption properties opens new potential in stretchable plasmonic devices, solar cells, and therapeutic as well as appropriate light absorption-based applications.