24 October 2012 Pure surface plasmon-polariton optical sensor using an H-cross-section fiber and Bragg gratings
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Proceedings Volume 8412, Photonics North 2012; 84120J (2012) https://doi.org/10.1117/12.2001667
Event: Photonics North 2012, 2012, Montréal, Canada
Abstract
In this paper, we develop a novel structure and approach of a pure surface Plasmon Polariton (SPP) sensor with fiber Bragg gratings (FBG) in gold coated specially designed H-cross-section fiber. We evaluate its potential for biological sensing applications of the surrounding refractive index (SRI). Pure SPP has almost all its field concentration at the metal-dielectric interfaces and hence, it is highly sensitive to changes in the sensed medium refractive index. This scheme represents an “in-line” optical fiber SPP sensor scheme. Also, it provides larger and more flexible sensing area along its flat side. Simulation results show that the gold layer thickness essentially influences the sensitivity, and the shape of the reflection spectrum. Increasing the gold layer thickness decreases its sensitivity and broadens the spectrum, increasing the FWHM bandwidth. Results show a maximum sensitivity of 230 nm/RIU and maximum figure of merit; defined as the ratio of sensitivity to FWHM bandwidth of the reflection spectrum; of 10952 RIU-1 (Sensitivity = 230 nm/RIU and FWHM = 2.1 x 10-5 μm) with gold thickness of 10 nm. In conclusion, the proposed sensor is highly sensitive and free from any moving parts and can be used as bio-chemical sensor.
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M. D. Baiad, M. D. Baiad, S. M. Tripathi, S. M. Tripathi, A. Kumar, A. Kumar, R. Kashyap, R. Kashyap, "Pure surface plasmon-polariton optical sensor using an H-cross-section fiber and Bragg gratings", Proc. SPIE 8412, Photonics North 2012, 84120J (24 October 2012); doi: 10.1117/12.2001667; https://doi.org/10.1117/12.2001667
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