High refractive index sensitivity sensing in gold nanoslit arrays

doi:10.1088/1674-1056/23/8/084201

Abstract The extraordinary optical transmission (EOT) phenomenon of nano-periodic aperture array in metallic film has been widely investigated and used in biosensors. The surface plasmon resonance and cavity mode in some periodic nanostructures, such as nanohole and nanoslit, cause EOTs at certain wavelengths. This resonance wavelength is sensitive to the refractive index on the surface of periodic nanostructures. Therefore, the metallic nanostructures are expected to be good sensing elements. The sensing performances of gold nanoslit arrays are experimentally and theoretically investigated. Three-dimensional finite difference time domain (FDTD) simulations are utilized to explore their transmission spectra and steady-state field intensity distributions. The electron beam evaporation, electron beam lithography, and ion milling are applied to the gold nanoslit arrays with different widths and periods. The sensing performances of the gold nanoslit array are characterized via transmission spectra in four kinds of refractive index samples. The highest sensitivity reaches 726 nm/RIU when the width of the gold nanoslit array is 38.5 nm.

Keywords: sensors extraordinary optical transmission nanoslit array cavity mode

Received: 04 September 2013
Revised: 16 December 2013
Accepted manuscript online:

PACS:	42.81.Pa	(Sensors, gyros)
	42.25.Bs	(Wave propagation, transmission and absorption)
	81.16.Rf	(Micro- and nanoscale pattern formation)
	42.65.Yj	(Optical parametric oscillators and amplifiers)

Fund: Project supported by the National Key Basic Research Program of China (973 Program) (Grant Nos. 2011CB933102, 2010CB934104, and 2011CB933203), the National Natural Science Foundation of China (Grant Nos. 61036009 and 61378058), and the Science Innovation Foundation of the Cooperation Project between Jilin Province and Chinese Academy of Sciences (Grant No. 2012CJT0037).

Corresponding Authors: Kan Qiang
E-mail: kanqiang@semi.ac.cn

Cite this article:

Yuan Jun (袁浚), Kan Qiang (阚强), Geng Zhao-Xin (耿照新), Xie Yi-Yang (解意洋), Wang Chun-Xia (王春霞), Chen Hong-Da (陈弘达) High refractive index sensitivity sensing in gold nanoslit arrays 2014 Chin. Phys. B 23 084201

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