An efficient hybrid plasmonic dichroic splitter based on subwavelength periodic metallic nanoslits

An efficient plasmonic dichroic splitter based on periodic metallic nanoslits milled in the metal–dielectric–Si hybrid plasmonic waveguide is proposed and investigated. The backside incident photons illuminated on the dichroic splitting structure are coupled and launched into the hybrid plasmonic modes propagating to the left- or right-side depending on the wavelength. Proof-of-principle demonstrations show that the good coupling and splitting performances with coupling efficiency 0.5 and high splitting ratios 26.4dB at wavelength 1310nm (right:left power contrast), and 0.46 and 21.7dB at wavelength 1550nm (left:right power contrast) are achieved, respectively. The operation principle is clarified and the performance is discussed.