Abstract
Electromagnetically induced transparency-like (EIT-like) effect is a very promising research area for ultra-sensitive sensing. Most sensors are either wavelength modulated or intensity modulated. In this paper, we propose a nanosystem, in which an EIT-like effect is generated for plasmonic sensors with integrated wavelength-modulated and intensity-modulated functions. The nanosystem consists of a gold (Au) grating andthree-layer insulator–metal–insulator structure. An EIT-like effect is formed by the destructive interference of surface plasmon polaritons (SPPs) on the upper and lower interfaces of the metallic layer. Using a two-oscillator coupling theory, we theoretically analyze the EIT-like effect and quantitatively reveal the damping characteristic of the two SPP modes and how they couple to each other. The presented nanosystem enriches the EIT-like implementation effect in plasmonic sensors.
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