Plasmonic Mach-Zehnder interferometric sensor based on a metal-insulator-metal nanostructure

A plasmonic Mach-Zehnder interferometric sensor based on a semicircular aperture-slit nanostructure patterned on a metal-insulator-metal film is proposed and demonstrated by finite difference time domain（FDTD） simulation. Due to the interference between two different surface plasmon polariton modes...

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Bibliographic Details
Published inChinese physics B Vol. 26; no. 7; pp. 328 - 332
Main Author 沈萌 王鸣 杜澜 潘庭婷
Format Journal Article
LanguageEnglish
Published 01.06.2017
Subjects
Mach
传感器
干涉
时域有限差分
模拟验证
纳米结构
表面等离子体
金属-绝缘体
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Summary:A plasmonic Mach-Zehnder interferometric sensor based on a semicircular aperture-slit nanostructure patterned on a metal-insulator-metal film is proposed and demonstrated by finite difference time domain（FDTD） simulation. Due to the interference between two different surface plasmon polariton modes in this design, the transmission spectra exhibit oscillation behaviors in a broad bandwidth, and can be readily tailored by changing the SPP path length and core layer thickness. Based on this principle, the characteristics of refractive index sensing are also demonstrated by simulation. This structure is illuminated with a collimated light source from the back side to avoid impacts on the interference. Meanwhile,these results show that the proposed structure is promising for portable, efficient, and sensitive biosensing applications.
Bibliography:Meng Shen,Ming Wang,Lan Du,Ting-Ting Pan（ Jiangsu Key Laboratory on Opto-Electronic Technology, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China）
surface plasmon polariton; Mach-Zehnder interferometry; metal-insulator-metal structures
A plasmonic Mach-Zehnder interferometric sensor based on a semicircular aperture-slit nanostructure patterned on a metal-insulator-metal film is proposed and demonstrated by finite difference time domain（FDTD） simulation. Due to the interference between two different surface plasmon polariton modes in this design, the transmission spectra exhibit oscillation behaviors in a broad bandwidth, and can be readily tailored by changing the SPP path length and core layer thickness. Based on this principle, the characteristics of refractive index sensing are also demonstrated by simulation. This structure is illuminated with a collimated light source from the back side to avoid impacts on the interference. Meanwhile,these results show that the proposed structure is promising for portable, efficient, and sensitive biosensing applications.
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/7/077301