Abstract
In this paper, quintuple Fano resonances are produced and numerically analyzed based on
a plasmonic resonator system. The system is composed of an optical
metal–insulator–metal (MIM) waveguide, a side-coupled
disk, and a concentric-ring resonator. Five Fano resonances can be
seen, which originate from the interaction of the cavity mode between
the disk resonator and the concentric-ring resonator. The transmission
spectrum shows that the Fano resonance can be independently tuned by
changing different geometrical parameters, such as the outer radius or
inner radius of the concentric-ring resonator. The refractive index
sensitivity is 1250nm/RIU for FR5, and the figure of merit is
138.9 (RIU is a refractive index unit). It can also serve as a
temperature sensor with a maximum sensitivity of about 0.4nm/∘C. Moreover, for slow light, the
maximum delay time is about 0.12 ps at FR3. The proposed
nano-scale structure has a sharp Fano line shape and effective ways of
tuning independently, which may have applications in slow light and
nano-biosensing; for example, we show the application of the detection
of different human blood types.
Funder
National Natural Science Foundation of China
Yangtze Fund for Youth Teams of Science and Technology Innovation
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics
Cited by
16 articles.
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