SPR sensor based on phase modulation and polarization interferometry

Le Liu; Yonghong He; Jihua Guo

doi:10.1117/12.710940

27 October 2006 SPR sensor based on phase modulation and polarization interferometry

Le Liu, Yonghong He, Jihua Guo

Proceedings Volume 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine; 60473I (2006) https://doi.org/10.1117/12.710940
Event: Fourth International Conference on Photonics and Imaging in Biology and Medicine, 2005, Tianjin, China

Abstract

In this paper, a new Surface Plasmon Resonance (SPR) sensor for refractive index (RI) based on polarization interferometry and phase modulation is presented. Its sensitivity is not a direct function on intensity variations(δr/δn), nor on phase variations(δφ/δn), but on ((δr/δn)▵φ+r(δφ/δn)) (here r and φ represent the amplitude and the phase of reflectivity; n represents the refractive index). According to our theoretical calculation, the dynamic range of this kind of SPR sensor is much wider than that of sensors based on either variations of intensity or variations of phase. This sensor can also provide very high resolution comparable with SPR sensors base on phase variations which has the highest sensitivities till now.

Citation Download Citation

Le Liu, Yonghong He, and Jihua Guo "SPR sensor based on phase modulation and polarization interferometry", Proc. SPIE 6047, Fourth International Conference on Photonics and Imaging in Biology and Medicine, 60473I (27 October 2006); https://doi.org/10.1117/12.710940

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