Plasmonic Filter and Demultiplexer Based on Square Ring Resonator

Zhaojian Zhang,Jie Huang,Dingbo Chen,Xin He,Yunxin Han,Junbo Yang,Jingjing Zhang

doi:10.3390/app8030462

Zhaojian Zhang, Jie Huang + Show 5 more

Open Access

https://doi.org/10.3390/app8030462

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Journal: Applied Sciences	Publication Date: Mar 17, 2018
Citations: 34	License type: CC BY 4.0

Affiliation: National University of Defense Technology

Abstract

A ring resonator is a basic component of traditional photonic integrated circuits (PIC), which has been, however, found difficult to be applied efficiently in high-compact plasmonic metal-insulator-metal (MIM) systems. Here, based on a plasmonic band-stop filter with a square ring resonator (SRR), a novel side-coupling method is introduced both numerically and theoretically to achieve a drop in the resonant wavelength in the SRR with considerable efficiency. By introducing the reflector structure, the performance can be appreciably improved. Besides, this structure also has potential for sensing and switching. Finally, a dual demultiplexer based on SRRs is realized at telecommunication wavelengths with comparable performance, which makes it possible to apply ring resonators in on-chip plasmonic wavelength division multiplex (WDM) networks. This work is valuable for PIC design, and will promote the on-chip plasmonic system progress.

Highlights

Surface plasmon polaritons (SPPs) are an electromagnetic field transferred on a metal-dielectric interface and have been widely studied due to their ability to trap energy with high density and break the diffraction limit of light [1]
We numerically propose a plasmonic MIM band-stop filter with an square ring resonator (SRR), as well as introduce a unique side-coupling method to drop the resonant wavelength with considerable efficiency and full width half maximum (FWHM)
By introducing a special side-coupling method, this work found a way to propose channel drop filter with the SRR based on the plasmonic MIM structure

Summary

Introduction

Surface plasmon polaritons (SPPs) are an electromagnetic field transferred on a metal-dielectric interface and have been widely studied due to their ability to trap energy with high density and break the diffraction limit of light [1]. We numerically propose a plasmonic MIM band-stop filter with an SRR, as well as introduce a unique side-coupling method to drop the resonant wavelength with considerable efficiency and full width half maximum (FWHM). The resonant peak shows transmission spectra related to different side lengths L of the SRR with a gap of 15 nm.

Applications in Sensing and Switching

Dual Demultiplexer for Telecommunication Wavelengths

Findings

Conclusions