This paper proposes a new metamaterial design that
can achieve electromagnetic induction transparency-like (EIT-like) effects in
the microwave band. The unit structure of metamaterials consists of square
rings and metal wires. The square ring acts as the “bright state” and the metal
wire acts as the “dark state”. The destructive interference between the bright
state and the dark state produces an EIT-like effect. In the simulation
results, a transparent window centered at 4.00 GHz can be observed in the
transmission spectrum. By studying the phase change of the transparent window,
it is found that the group delay of the metamaterial structure can reach 0.39
ns at 4.00 GHz. This paper also studies the
influence of the refractive index of the medium on the EIT-like effect.
Numerical simulations show that such metamaterial is very sensitive to the
refractive index of the medium, and the sensitivity is 15 mm/RIU. Our design
can be extended to other frequency bands and may have potential applications in
filtering, sensing, slow-light devices, and nonlinear optics.
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