Transmission-type SPR sensor based on coupling of surface plasmons to radiation modes using a dielectric grating

doi:10.1007/s12200-009-0040-x

Front Optoelec Chin

2009, Vol. 2

Issue (2) : 182-186 https://doi.org/10.1007/s12200-009-0040-x

RESEARCH ARTICLE

Transmission-type SPR sensor based on coupling of surface plasmons to radiation modes using a dielectric grating

Changkui HU^1,2(

), Deming LIU¹

1. College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. School of Science, Wuhan University of Technology, Wuhan 430070, China

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Abstract

A transmission-type surface plasmon resonance (SPR) sensor is presented. In the transmission-type SPR structure, surface plasmon waves are outcoupled to radiation modes by the use of dielectric grating on a thin-film layer of Ag. Compared with the traditional reflection-type SPR sensor, the new method provides larger detectable range, which might be useful to investigate thick targets such as in cell analysis. Theoretical simulations show that the structures provide high transmission efficiency for surface plasmon resonance and the devices present extremely linear sensing characteristics. Furthermore, it is found that the transmission efficiency and the refractive index detection sensitivity of the SPR sensor can be improved by the use of a lower refractive index glass prism.

Keywords surface plasmon resonance (SPR) optical sensors glass prism rigorous coupled wave analysis

Corresponding Author(s): HU Changkui,Email:hck@whut.edu.cn

Issue Date: 05 June 2009

Cite this article:

Changkui HU,Deming LIU. Transmission-type SPR sensor based on coupling of surface plasmons to radiation modes using a dielectric grating[J]. Front Optoelec Chin, 2009, 2(2): 182-186.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0040-x
https://academic.hep.com.cn/foe/EN/Y2009/V2/I2/182

Fig.1 Schematic of studied setup that consists of Kretschmann configuration in which a dielectric grating is placed on the top of metal layer

Fig.2 Reflectance (0R) and transmittance (0T, -1T and -2T) plotted as a function of incidence angle (=1, =110?nm, =54.20o, and =63.264%)

Fig.3 Influence of thickness of dielectric gratings on resonance characteristics (Λ=600?nm, VF=0.5, and =40?nm). (a) Transmittance efficiency (-1T) and resonance angle plotted as a function of thickness of dielectric gratings; (b) reflectance (0R) and transmittance (-1T) plotted as a function of incidence angle for the case of =180?nm at =55.96o and =65.263%

Fig.4 Influence of period of dielectric gratings on resonance characteristics (=180?nm, VF=0.5, and =40?nm). (a) Transmittance efficiency (-1T) and resonance angle plotted as a function of period of dielectric gratings; (b) reflectance (0R) and transmittance (-1T) plotted as a function of incidence angle for the case of Λ=560?nm at =55.88o and =72.829%

Fig.5 Transmittance spectra as increases from 1.00 to 1.05 for three different prism materials. (a) =3.19 corresponding to LaSFN21; (b) =2.2958 corresponding to BK7 glass; (c) =2.1199 corresponding to synthesized quartz

Fig.6 Plot of resonance angle as function of refractive index of superstrate obtained for three different prism materials (slope of each line indicates the angular sensitivity)

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