Article

Refractive index sensor based on surface-plasmon interference.

State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing, China.
Optics Letters (impact factor: 3.4). 03/2009; 34(3):392-4. pp.392-4
Source: PubMed

ABSTRACT We propose a refractive index sensor based on the interference of two surface-plasmon waves on both surfaces of a gold film with a two-slit structure. The phase of the interference was solved, and the dispersion relation of the real part of Au dielectric function was considered. The sensor was performed with NaCl-H2O solutions of different concentrations and exhibited a linear response and a high sensitivity of 4547 nm/RIU (refractive index unit) to the refractive index change.

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Keywords

Au dielectric function
 
different concentrations
 
dispersion relation
 
exhibited
 
gold film
 
NaCl-H2O solutions
 
refractive index unit
 
surface-plasmon waves
 
two-slit structure