Polarimetric Spectral Surface Plasmon Resonance Sensor

Ibrahim Watad Department of Electro-optic Engineering, Ben-Gurion University of the Negev, Beer-Sheeva, Israel Ibrahim Abdulhalim Department of Electro-optic Engineering, Ben-Gurion University of the Negev, Beer-Sheeva, Israel

Intensity based surface plasmon resonance (SPR) sensors are widely used, but they still lack the sensitivity of detection, especially of low analyte concentrations. Profiting from the sharp jump in phase under SPR, we suggest working with this aspect in the spectral domain, which is more sensitive than the angular domain and its polarimetric properties were not investigated thoroughly. The prism and sample are between a polarizer and an analyzer and for each measurement of the phase difference we took three intensity measurements at three different orientations of the polarizer\analyzer. Measurements at different concentrations of Ethanol in Water were carried out using several polarimetric siganls and compared to the intensity measurements. The maximal value of the cosine of the phase shift between the p and s-polarization components of the reflected wave is found to be much better defined than the minimum value in the intensity. This leads to a better sensitivity and a lower detection limit.

References:

[1] Y. H. Huang, H. P. Ho, S. K. Kong, and A. V. Kabashin, Ann. Phys. (Berlin) 524, No. 11, 637-662 (2012).

[2] A. Shalabney and I. Abdulhalim, Laser Photonics Rev. 5, No. 4, 571-606 (2011).

watadib@post.bgu.ac.il









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