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

doi:10.1088/1674-1056/26/7/077301

Abstract 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.

Keywords: surface plasmon polariton Mach–Zehnder interferometry metal–insulator–metal structures

Received: 14 February 2017
Revised: 10 April 2017
Accepted manuscript online:

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	73.21.Ac	(Multilayers)
	42.25.Hz	(Interference)
	07.07.Df	(Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.51405240 and 61178044),the Natural Science Foundation of Jiangsu Province of China (Grant No.BK20161559),the Natural Science Foundation of the Higher Education Institutions of Jiangsu Province of China (Grant No.16KJB510018),and University Postgraduate Research and Innovation Project of Jiangsu Province,China (Grant No.KYLX16_1289).

Corresponding Authors: Ming Wang
E-mail: wangming@njnu.edu.cn

Cite this article:

Meng Shen(沈萌), Ming Wang(王鸣), Lan Du(杜澜), Ting-Ting Pan(潘庭婷) Plasmonic Mach–Zehnder interferometric sensor based on a metal–insulator–metal nanostructure 2017 Chin. Phys. B 26 077301

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

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