18 December 2012 Metal oxide layer influence on the sensitivity of SPR fiber optic sensor
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Proceedings Volume 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 86971N (2012) https://doi.org/10.1117/12.2001267
Event: 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2012, Ostravice, Czech Republic
Abstract
A model of surface plasmon resonance fiber optic sensor operated in spectral domain is presented. The sensing scheme is based on a multimode optical fiber whose core is covered by thin silver film. Theoretical description of the proposed fiber optic structure is carried out in the frame of multilayer optic approximation. For the sake of clarity, the excitation by collimated centro-symmetric beam focused on the sensing fiber axis is supposed and only the propagation of meridional rays is considered. The contribution of s and p-polarization is included in the computation, however only p-polarization is affected by surface plasmon resonance phenomenon. The optical dispersion of all involved materials is taken into account. It is known that the usage of silver surface plasmon resonance detection layer leads to narrower dip (comparing to gold layer) and higher sensitivity, but the chemical stability of silver is the potential problem. The solution to this problem can be the creation of oxide overlayer on the top of the surface plasmon resonance detection layer. The effect of the overlayer thickness on the performance of the sensor is analyzed in detail using numerical simulation and discussed in terms of sensitivity and detection accuracy.
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Dalibor Ciprian, Petr Hlubina, "Metal oxide layer influence on the sensitivity of SPR fiber optic sensor", Proc. SPIE 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 86971N (18 December 2012); doi: 10.1117/12.2001267; https://doi.org/10.1117/12.2001267
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