title: Ultra-high resolution filter and optical field modulator based on a surface plasmon polariton.
abstract: A new filter structure and optical field modulator with ultra-high resolution based on plasmonic nano-cavity resonators is proposed and numerically investigated. The structure consists of a square nano-cavity resonator connected with several waveguides. All waveguides and cavity are etched on a silver film whose size is 1.1×0.75  μm. Compared with traditional filters, the FWHM (full width at half-maximum) of this structure's spectrum curve can be less than 7 nm; namely, the resolution has been greatly improved. The structure also presents the feature of an optical field modulator when both inputs are working simultaneously, and it provides a promising way to design and manufacture future optical logical device.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Wu
authors.forename: Junbo
authors.initials: J
authors.lastname: Yang
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Huang
authors.forename: Dingbo
authors.initials: D
authors.lastname: Chen
authors.forename: Hongqing
authors.initials: H
authors.lastname: Wang