Design of optical range third-order Chebychev low-pass filter using plasmonic nanostrip waveguides

In this paper, we present a new optical range low-pass filter based on plasmonic nanostrip waveguides. We calculate the characteristic impedance of plasmonic nanostrip waveguides and compare it with that of microstrip transmission lines. An optical range Chebychev low-pass filter with subwavelength dimensions is designed based on nanostrip waveguides. Finite-difference time-domain (FDTD) simulations of the designed optical range filter are presented, which demonstrate subwavelength light-confinement as well as acceptable filter cutoff performance.