Detecting phase shifts in surface plasmon resonance by polarization heterodyne interferometry

Document Type : Full length research Paper


Photonics Research Laboratory, Department of Physics, Faculty of Science, University of Qom, Qom


Among the different surface plasmon-based measurement techniques, the detection of phase of surface plasmon is one of the most accurate and sensitive methods. The phase can be measured accurately in different interference based techniques. In this study, the phase and intensity of the surface plasmon was simulated and then the phase shift of surface plasmon wave was experimentally measured by heterodyne polarization interferometry. The response of sensing head to the refractive index change of surrounding medium were obtained. According to the obtained results, the average sensitivity of the phase in the solution of water/alcohol was 0.4426 degree/%gr/ml and for the solution of water/glucose was 1.4765 degree/%gr/ml. The detection limit for solution of water/alcohol and the solution of water/glucose were measured 0.49 %gr/ml and 0.14 %gr/ml, respectively.


Main Subjects

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