Compact Surface plasmon resonance sensor with simultaneous spectral, angular and temporal interrogation.

Yann Niberon^1,2*, How-Foo Chen¹, Sylvain Blaize²

¹Institute of biophotonics, National Yang-Ming University, Taipei, Taiwan
²Light, Nanomaterials and Nanotechnology, University of Technology of Troyes, Troyes, France

* Presenter:Yann Niberon, email:yniberon@ym.edu.tw

Surface plasmon resonance (SPR) is a technic used to detect specific chemical binding through time with high sensitivity and specificity. In this study, we propose a compact SPR sensor with broadband excitation simultaneously over a large range of incident angles. Determination of Sucrose concentration in Di-water is used to test its performance. Based on a static system with reflection over parabolic surfaces and using white light source, in the Kretschmann configuration we realize simultaneously an angular and spectral interrogation to generate a multispectral image that gives us a reflectance mapping along two axes in real time. The real time aspect gives us the possibility to study the evolution the resonance condition with variation of the refractive index of a solution tested through time for a certain range of incident angle in the visible spectrum. As an application, a kinetic study is realized with different sucrose concentration in Di-water. With this technic, we have reached a sensitivity to detect a refractive index shift of the order 10-5. The advantage of this SPR sensor design compare to conventional system is the three-dimensional aspect determining the resonance condition without the need to fix one of the three parameters: incident angle, wavelength and time.

Keywords: Plasmon, Sensing, Multispectral