High-sensitivity liquid refractive-index sensor based on a Mach-Zehnder interferometer with a double-slot hybrid plasmonic waveguide

被引：107
|
作者：
Sun, Xu [1 ,2 ,3 ]
Dai, Daoxin [2 ,3 ,4 ]
Thylen, Lars [1 ,2 ,3 ,5 ,6 ]
Wosinski, Lech [1 ,2 ,3 ]
机构：
[1] KTH Royal Inst Technol, Sch Informat & Commun Technol, S-16440 Kista, Sweden
[2] Royal Inst Technol Sweden & Zhejiang Univ, Joint Res Ctr Photon JORCEP, Uppsala, Sweden
[3] Zhejiang Univ, Hangzhou 310003, Zhejiang, Peoples R China
[4] Zhejiang Univ, Ctr Opt & Elect Res, State Key Lab Modern Opt Instrumentat, Hangzhou 310058, Zhejiang, Peoples R China
[5] KTH Royal Inst Technol, Dept Theoret Chem & Biol, S-10691 Stockholm, Sweden
[6] Hewlett Packard Labs, Palo Alto, CA 94304 USA
来源：
OPTICS EXPRESS | 2015年 / 23卷 / 20期
基金：
瑞典研究理事会;
关键词：
SILICON-ON-INSULATOR; RESONATORS;
D O I：
10.1364/OE.23.025688
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A Mach-Zehnder Interferometer (MZI) liquid sensor, employing ultra-compact double-slot hybrid plasmonic (DSHP) waveguide as active sensing arm, is developed. Numerical results show that extremely large optical confinement factor of the tested analytes (as high as 88%) can be obtained by DSHP waveguide with optimized geometrical parameters, which is larger than both, conventional SOI waveguides and plasmonic slot waveguides with same widths. As for MZI sensor with 40 mu m long DSHP active sensing area, the sensitivity can reach as high value as 1061nm/RIU (refractive index unit). The total loss, excluding the coupling loss of the grating coupler, is around 4.5dB. (C) 2015 Optical Society of America
引用
收藏
页码：25688 / 25699
页数：12
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