title: Broad band focusing and demultiplexing of in-plane propagating surface plasmons.
abstract: On the basis of a novel phase modulation method by in-plane diffraction processes, a well-designed nanoarray on metal surface is proposed to realize a broad band focusing (bandwidth ∼100 nm) and a demultiplexing element (resolution ∼12 nm) of surface plasmon polariton (SPP) waves. Moreover, sublattice arrays are developed to achieve an improved demultiplexer and confocal SPP beams. The proposed scheme with implemented functionalities is designed totally in planar dimension, which is free of the SPP coupling process and indicates more practical application in photonic integrations.
authors.affiliation: National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Shuming
authors.initials: S
authors.lastname: Wang
authors.forename: Shining
authors.initials: S
authors.lastname: Zhu
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhang