全三维亚波长高 Q 值表面等离子体激元腔。

Full three-dimensional subwavelength high-Q surface-plasmon-polariton cavity.

机构信息

Department of Physics, Korea University, Seoul 136-701, Korea.

出版信息

Nano Lett. 2009 Dec;9(12):4078-82. doi: 10.1021/nl902274m.

PMID:19995082

Abstract

We propose a full three-dimensional subwavelength surface-plasmon-polariton cavity based on a metal-coated dielectric nanowire with an axial heterostructure. Surface plasmon-polaritons are strongly confined at the nanowire-metal interface sandwiched by an effective plasmonic mirror that consists of lower-index nanowire core and metal shell. Numerical simulations show for a cavity <50 x 50 x 40 nm(3) (mode volume, V approximately 10(-5) microm(3)) that a quality factor, Q, >36000 is achieved at 20 K. This ultrasmall plasmonic cavity can be used as a plasmonic emitter or laser device coupled to a plasmonic waveguide with a high coupling efficiency in deep-subwavelength photonic systems.

摘要

我们提出了一种基于具有轴向异质结构的金属包覆介电纳米线的全三维亚波长表面等离激元-极化激元腔。表面等离激元在由低折射率纳米线芯和金属壳组成的有效等离子体镜夹在纳米线-金属界面处被强烈限制。数值模拟表明，对于腔<50 x 50 x 40 nm(3)（模式体积，V 约为 10(-5) μm(3))，在 20 K 时实现了>36000 的品质因数 Q。这种超小的等离子体腔可以用作等离子体发射器或激光器件，与具有高耦合效率的等离子体波导耦合，用于深亚波长光子系统。