Optics and Photonics Society of Iran

Optical trapping of plasmonic nano-particles is important in many scientific and technological applications. Alloyed nano-particles have less extinction than pure Au and Ag nano-particles which cause different values for trapping forces. In this letter, optical trapping of Au-Fe nano-alloys with different atomic percent of Fe have been investigated theoretically. It has been shown that, maximum trapping force in the axial direction increases with atomic percent of Fe. In the contrary, stiffness reduces.