Abstract
Surface plasmon polaritons (SPPs) of metal materials such as gold and silver are excited in the visible and near-infrared band, while the graphene SPPs exist from mid-infrared to terahertz (THz) ranges. Hence it is difficult to realize the coupling of SPPs of metals and graphene. In this paper, we realize coupling of two SPPs modes based on graphene and polyvinylidene fluoride (PVDF) in THz range, which is vital for the research of new sensors in terahertz spectrum. Based on the dispersion relation, it is demonstrated that the two different THz SPP modes in the hybrid configuration can be coupled together. We apply our design to the imaging sensor, and the highest imaging sensitivity as high as 730RIU−1 is realized in the proposed sensors (which can be used in gas detection). Our results suggest that the strong coupling of two SPPs modes is an efficient method to achieve high sensing properties for the devices.
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