The transmission characteristics of the nanowire waveguide with a parallel finite length metal nanowire
PANG Shaofang1 , QU Shixian2, ZHANG Yongyuan1, XIE You1, HAO Limei1
(1 School of Science, Xi′an University of Science and Technology, Xi′an 710054, Shaanxi, China;2 School of Physics and Information Technology, Shaanxi Normal University, Xi′an 710119, Shaanxi, China)
Abstract:
Using the finite element method, the propagation properties of the nanowire waveguide in parallel to a finite length metal nanowire are investigated with varying the length and radius of metal nanowire, the effective refractive index of medium, and the distance between the nanowire and waveguide.The results show that the surface plasmon polaritons resonance is formed in the coupling area along the length of the metal nanowire direction. With the increase in length of finite metal nanowire length, the transmittance decreases periodically. The transmittance of hybrid waveguide is affected by the radius of finite length metal nanowires. The transmittance increases with increasing radius of the nanowire as well as the refractive index of dielectric substrate. In addition, the transmittance is closely related with the distance between the finite length metal nanowire and waveguide, and there has minimum transmittance when the distance is 20 nm.
KeyWords:
nanowire hybrid waveguide; surface plasmon polaritons; transmission characteristics; finite element method
