Proposing an on/off optical router in telecom wavelength using plasmonic tweezer

Abstract

This study proposes a plasmonic tweezer using an array of plasmonic bowties which operates as a narrow band filter in an optical telecommunication window when the core–shell nanoparticle is fixed within the fluidic medium and the incident wave is considered as a polychromatic light. Conversely, in the case of manipulating the nanoparticle, the structure acts as an on/off optical router in a fixed wavelength (λ=1.55 micron). Optical forces acting on the nanoparticle have been calculated using the Maxwell stress tensor which enabled us to obtain the nanoparticle manipulation and consequently, the transmission/reflection spectra of the proposed structure over time during the movement of the nanoparticle. A plane wave source with the intensity of 130mw∕m2 was used to excite this plasmonic structure and the results were investigated using a numerical finite difference time domain (FDTD) method.