Fluorescent microscopy using localized excitation source with gold nanotriangles: A computational study

► We have proposed a new method for fluorescent microscopy using localized excitation source according to the enhancement in third order nonlinear effects (THG and FWM) in gold nanotriangles (acting as nonlinear optical antenna). ► We have computationally investigated our proposed method using nonlinear FDTD method. ► We have shown that using nonlinear localized excitation, will improve spatial resolution below 100 nm and signal to noise ratio at least 30%.