A novel nano-scale polarizer based on surface plasmon

A novel nanoscale polarizer based on surface plasmon polaritons is proposed by adding a silver nanoribbon to a traditional waveguide directional coupler. The novel polarizer can realize the polarization output of the TE mode with the characteristics of high extinction ratio and extremely compact dimension. The influences of the polarizer parameters including the length of coupling region, the width of silver nanoribbon, wavelength and the angle of the output light on the TE mode and TM mode coupling efficiency are discussed. Simulation results indicate that the extinction ratio of TE mode can reach 15 dB at the wavelength of 1550nm.