Optical trapping of Au-Fe alloyed nanoparticles: a theoretical calculation

Ebrahim Madadi

Magnetoplasmonic nanoparticles such as Au-Fe alloys
 are very intersting for their properties. In this article, the 
 optical trapping of Au-Fe nanoparticles
 are investigated as a function of Fe atomic percent doped in 
 gold nanoparticles, theoretically.
 Using Lorenz-Mie theory it is shown that the maximum force
 exerted on the alloyed nanoparticles enhances about $75\%$ 
 with increaseing Fe atomic percent. It is shown that
 trapping strength is depth-dependent and shows $20\%$ increment 
 in shallow positions and $17\%$ decrement
 in the axial direction in the optimal depth which
 is $7\mu m$ deep inside the sample.
 Wavelength dependence of alloyed nanoparticles is studied, too.

DOI