由非对称波导引导的具有紧密场限制的混合远程表面等离激元-极化激元模式。

Hybrid long-range surface plasmon-polariton modes with tight field confinement guided by asymmetrical waveguides.

作者信息

Chen Jianjun, Li Zhi, Yue Song, Gong Qihuang

机构信息

State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China.

出版信息

Opt Express. 2009 Dec 21;17(26):23603-9. doi: 10.1364/OE.17.023603.

DOI:10.1364/OE.17.023603

PMID:20052069

Abstract

A finite width dielectric-metal-dielectric (DMD) waveguide placed on a substrate is numerically investigated near the telecom wavelength lambda = 1550 nm by the finite element method. With proper waveguide sizes, the asymmetrical DMD waveguide can support hybrid long-range surface plasmon-polariton modes which have tight field confinement (approximately 700 nm) and long propagation lengths (L> 300 microm) simultaneously. Compact plasmonic waveguide-ring resonators (WRRs) based on such asymmetrical DMD waveguide show high quality factors compared with dielectric-loaded surface plasmon-polariton, channel plasmon polariton, plasmonic whispering-gallery microcavity, and pure dielectric waveguide cases.

摘要

采用有限元方法对放置在衬底上的有限宽度介质-金属-介质（DMD）波导在电信波长λ = 1550 nm附近进行了数值研究。通过适当的波导尺寸，非对称DMD波导可以支持混合长程表面等离激元-极化激元模式，该模式同时具有紧密的场限制（约700 nm）和长传播长度（L> 300μm）。与介质加载表面等离激元-极化激元、通道等离激元极化激元、等离激元回音壁微腔和纯介质波导情况相比，基于这种非对称DMD波导的紧凑型等离激元波导环谐振器（WRR）显示出高品质因数。