Abstract
Based on a novel phase-sieve method by in-plane interference processes, a well-designed nonperiodic nanogroove array on gold surface is proposed as a multifunctional and multi-output plasmonic meta-element (MPM) for surface plasmon polariton waves. An MPM functions as a plasmonic lens (PL) as well as a plasmonic array illuminator (PAI), and another MPM acts as two PLs with an intersection angle of π/4 are fabricated and validated by leakage radiation microscopy measurements. Our proposed scheme with implemented functionalities could promote potential applications in high density integrated optical circuits.
Highlights
The aggressive pursuit of ever-increasing high levels of integration on optical circuits has been a hallmark of the industry and the academe
New opportunities for confining light to rather small dimensions are provided by utilizing surface plasmon polaritons (SPPs), which are hybrid modes of photons and electronic charge-density oscillations at a metal/dielectric interface [2,3,4]
We propose a multifunctional and multi-output plasmonic meta-element (MPM) on gold films, which can control SPP wavefronts in two or four predefined directions with different functions
Summary
The aggressive pursuit of ever-increasing high levels of integration on optical circuits has been a hallmark of the industry and the academe. Various planar plasmonic devices have been successfully fabricated to control the propagation of plasmonic fields because of their unique two-dimensional (2D) confinement of electromagnetic field at the metal surface. Spatially-defined phase modulation methods for manipulating SPP propagations from a nonperiodic array were carried out and have achieved great success [16,17,18,19]. These approaches all have a common severe limitation, in which the SPP wavefront emerging in a specific direction is designed to target a single particular application. Multichannel and multifunction manipulations of SPPs can be directly achieved in a single component by using these devices
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