Abstract
In this study, we propose a black phosphorus (BP)/waveguide terahertz plasmonic sensing structure comprising vertically stacked crystal quartz, polymethylpentene (TPX), BP, crystal quartz, and TPX layers on a germanium prism. Sharp Fano-type resonance is induced by strong coupling between the surface plasmon polariton and planar waveguide modes, and it generates imaging sensitivity of up to 9.978 × 103 RIU−1 for gas detection, with better sensing performance than other terahertz plasmonic gas sensors. Due to the in-plane anisotropic plasmonic property of BP, the proposed sensing structure exhibits optically tunable detection sensitivity and the imaging sensitivity is highly dependent on the direction. In addition, we investigated the changes in the Fano resonance and surface plasmon resonance, as well as the figure of merit for the imaging sensitivity according to structural parameters such as the thicknesses of the crystal quartz and TPX layers. Our results suggest that the proposed structure may have potential applications in gas detection in the terahertz band.
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