Optical Absorption Properties of Fe/Co/Ni-Au Core-Shell Nanostructures

Magneto-plasmonic nanostructures have attracted much attention due to their prospective applications in optoelectronics, nano-medicine, and biology. Simulations are carried out in the area of the combination of magnetic and plasmonic nanoparticles as core-shell nanostructures. Presently, we have studied the optical properties of Fe@Au, Co@Au, Ni@Au bimetallic core-shell nanospheres with different core sizes and shell thickness by using Discrete Dipole Approximation (DDA) simulation technique. It is found that absorption LSPR peaks occur in UV and visible region of the electromagnetic (EM) spectrum. The shifting in LSPR peaks has been observed with the increase of core size as well as shell thickness, whereas, absorption efficiency is found to increase as a function of shell thickness. It is concluded that the absorption LSPR peaks can be tuned by changing core size and shell thickness. Revealed plasmonics properties for core-shell NPs at wavelength of 333-523nm will open the new applications avenues in sensing, imaging, and therapeutics.