Abstract

Terahertz (THz) plasmonlike excitation on top of a thin ferroelectric polyvinylidene fluoride layer covering a solid-core polymeric Bragg fiber and facing liquid analyte is demonstrated theoretically. In a view of designing a fiber-based sensor of the analyte refractive index, phase matching of a THz plasmonlike mode with the fundamental core guided mode of a fiber is then demonstrated for the most challenging case of low refractive index analytes. A novel sensing methodology based on the core mode anomalous dispersion is proposed. Similarly to the surface plasmon resonance sensors in the visible, we show the possibility of designing high-sensitivity sensors in the THz regime with a resolution of 2×104 in refractive index change.

© 2008 Optical Society of America

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