Investigation of Surface Plasmon Resonance in Multilayered Onion-Like Heteronanocrystal Structures

This paper investigates the interaction of light with some novel multilayered nanostructure in a nonabsorbing medium, which causes change in optical features such as plasmon resonances and their hybridization. The latter phenomenon provides a powerful means of confining light to multilayered nanostructures interfaces, which can generate intense local electromagnetic fields and significantly can amplify the signal. Especially, the motivation of this paper is to determine some suitable nanoparticle geometries and their composition that would result to plasmon tunability (plasmon hybridization) across the visible to near infrared spectra. With plasmons, photonic signals can be manipulated on the nanoscale and can be used in biomedical applications such as high-resolution optical imaging, electromagnetic field enhancement, and biosensing. Moreover, it can be used not only for the enhancement of electromagnetic fields in deep-tissue optical imaging but also in the two-operational distinct spectra for multicolor optical imaging. Specifically, we have investigated some nanoparticles with a different composition that has a strong plasmon resonance which extend into considering spectra (infrared regions). Furthermore, the splitting of the surface plasmon into two distinctive modes as a result of the difference in polarization between the nanoparticle's outer and inner surfaces has been probed. Finally, some simulations are done and their results are shown that the plasmon resonance of the concentric novel nanostructures is due to the hybridization of the inner and outer shell plasmons.