Surface Plasmon Resonance-like integrated sensor at terahertz frequencies for gaseous analytes

Engineering Physics Department, Ecole Polytechnique de Montréal, C.P. 6079, succ. Centre-Ville Montreal, Québec H3C3A7, Canada.
Optics Express (Impact Factor: 3.49). 01/2009; 16(25):20206-14. DOI: 10.1364/OE.16.020206
Source: PubMed


Plasmon-like excitation at the interface between fully polymeric fiber sensor and gaseous analyte is demonstrated theoretically in terahertz regime. Such plasmonic excitation occurs on top of a approximately 30 microm ferroelectric PVDF layer wrapped around a subwavelength porous polymer fiber. In a view of designing a fiber-based sensor of analyte refractive index, phase matching of a plasmon-like mode with the fundamental core guided mode of a low loss porous fiber is then demonstrated for the challenging case of a gaseous analyte. We then demonstrate the possibility of designing high sensitivity sensors with amplitude resolution of 3.4 x 10(-4) RIU, and spectral resolution of 1.3 x 10(-4) RIU in THz regime. Finally, novel sensing methodology based on detection of changes in the core mode dispersion is proposed.

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