Multiple plasmon-induced transparency with extra-high FOM based on a MIM waveguide composed of stubs

Abstract

A plasmon structure based on a metal-insulator-metal (MIM) waveguide composed of three stubs (TSs) is proposed, and its transmission characteristics are studied numerically by the finite element method (FEM). The simulation results show that multiple plasmon-induced transparencies (PITs) with high transmission can be produced in the structure and can be tuned effectively. By adjusting the structure parameters, more high-order PITs with narrower window are generated. Furthermore, the proposed MIM waveguide is sensitive to the environment and the maximum values of refractive index sensitivity and figure of merit (FOM) are 1340 nm R−1IU−1 and 251/RIU, respectively. Multiple, adjustable and narrow PITs with high FOM can be induced in the proposed structure, which can be used in the fields of multi-channel filters, optical switches, storages, sensors, and so on.

Localized surface plasmon induced transparency and spatial resolution enhancement of nanosensors

“…The resonances in the cavity can be used to sense. A sensor performance can be described by Sensitivity (S) and figure of merit (FOM), which defined as [22,23,28] ( )…”

“…In metallic structures, resonant bright mode couples to dark mode and forms plasmonic Fano resonances (PFR), which are observed in M-type [21] and triangular metallic resonators [22]. Based on the PFR, high performance nanosensor [23][24][25], demultiplexers [26,27] and slow-light devices [28] are designed. Plasmon-induced reflectance [29] and absorption [30] phenomena appear in coupled metallic cavities and waveguide systems.…”

“…Nanosensors based on the PIT and PFR take the advantage of SPPRs in metallic cavities [8,9,12,[21][22][23]. In these traditional resonant cavities, SPPs are reflected back and forth, forming cavity resonances (CRs) at special frequencies.…”