Energy intensity analysis of modes in hybrid plasmonic waveguide

doi:10.1007/s12200-012-0195-8

Front Optoelec

2012, Vol. 5

Issue (1) : 68-72 https://doi.org/10.1007/s12200-012-0195-8

RESEARCH ARTICLE

Energy intensity analysis of modes in hybrid plasmonic waveguide

Ruixi ZENG^1,2, Yuan ZHANG¹(

), Sailing HE^1,2

1. Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentations, Zhejiang University, Hangzhou 310058, China; 2. Joint Research Center of Photonics of Zhejiang University and South China Normal University, South China Normal University, Guangzhou 510006, China

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Abstract

A hybrid plasmonic waveguide containing silicon core, silver cap and ultra-thin sandwiched SiO₂ layer is studied. By analyzing the mode distribution patterns and the curves of mode effective index, we show how the plasmonic mode around the metal surface is coupled with the fundamental mode in the silicon core to form a squeezed hybrid mode. The ability of the hybrid plasmonic waveguide in energy confinement is also discussed quantitatively.

Keywords plasmonic hybrid plasmonic waveguide energy intensity integration density

Corresponding Author(s): ZHANG Yuan,Email:zhydxx@zju.edu.cn

Issue Date: 05 March 2012

Cite this article:

Ruixi ZENG,Yuan ZHANG,Sailing HE. Energy intensity analysis of modes in hybrid plasmonic waveguide[J]. Front Optoelec, 2012, 5(1): 68-72.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0195-8
https://academic.hep.com.cn/foe/EN/Y2012/V5/I1/68

Fig.1 Cross section of the two hybrid plasmonic waveguides studied in this paper

Fig.2 Real part (a) and imaginary part (b) of effective index of the two types of designs in Fig. 1 as the width of the silicon core increases. Blue square curves and red triangle curves are for structures in Figs. 1(a) and 1(b), respectively

Fig.3 Energy flux density distributions of hybrid plasmonic mode for structure of Fig. 1(a) when silicon width is (a) 100 nm; (b) 200 nm; and (c) 400 nm. Black curve at the left of each pattern is the distribution along the cross section (dashed lines); (d) illustration showing plasmonic mode and dielectric mode couple to form a hybrid plasmonic waveguide mode

Fig.4 Real part (blue curve) and imaginary part (red curve) of effective index as the width of metal cap increases when the width of silicon core is fixed to (a) 400 nm; and (b) 200 nm ( = 250 nm, = 20 nm; = 100 nm)

Fig.5 Confinement factor (red triangle curve) and the ratio of energy stored in SiO to that in Si core (blue square curve) as increases from 100 to 400 nm

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