Diffraction grating-coupled surface plasmon resonance sensor based on spectroscopy of long-range and short-range surface plasmons

M. Vala; J. Dostálek; J. Homola

doi:10.1117/12.723131

16 May 2007 Diffraction grating-coupled surface plasmon resonance sensor based on spectroscopy of long-range and short-range surface plasmons

M. Vala, J. Dostálek, J. Homola

Author Affiliations +

Proceedings Volume 6585, Optical Sensing Technology and Applications; 658522 (2007) https://doi.org/10.1117/12.723131
Event: International Congress on Optics and Optoelectronics, 2007, Prague, Czech Republic

Abstract

We report a SPR biosensor based on long-range (LR) and short-range (SR) surface plasmon (SP) modes excited simultaneously on a diffraction grating. Employing the LRSP and SRSP in the grating-coupled SPR sensor offers several interesting features such as extended probe depth of the LRSP and ability to distinguish sensor response caused by bulk and surface refractive index changes. Prototype device based on wavelength interrogation of SPs was developed and be tested in model refractometric experiment. This paper presents results of theoretical analysis and experimental characterization of the sensor. Sensitivity of the laboratory prototype of the sensor agrees well with the theory. The sensor is shown to be able to detect changes in the refractive index as small as 3.5 x 10^-6 RIU (refractive index unit).

Citation Download Citation

M. Vala, J. Dostálek, and J. Homola "Diffraction grating-coupled surface plasmon resonance sensor based on spectroscopy of long-range and short-range surface plasmons", Proc. SPIE 6585, Optical Sensing Technology and Applications, 658522 (16 May 2007); https://doi.org/10.1117/12.723131

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