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Abstract In this paper, we propose a high performance biosensor which allows the coupling between surface plasmon polariton (SPP) mode in metal–insulator–metal waveguide and planar waveguide (PWG) mode. The reflection… Click to show full abstract
Abstract In this paper, we propose a high performance biosensor which allows the coupling between surface plasmon polariton (SPP) mode in metal–insulator–metal waveguide and planar waveguide (PWG) mode. The reflection curve exhibits a sharp dip originated from PWG mode when there is a weak coupling between SPP and PWG modes. The strong coupling between SPP and PWG modes results in asymmetric Fano resonance and plasmon-induced transparency. The sensitivities of PWG mode dip and Fano resonance achieve 9733 and 7050 RIU−1, respectively, which are enhanced by 2 ∼ 3 orders of magnitude compared to those of conventional surface plasmon resonance sensors.
Journal Title: Optics Communications
Year Published: 2020
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