Polarization-Independent Metamaterial Analog of Electromagnetically Induced Transparency for a Refractive-Index-Based Sensor
Fan-Yi Meng, Qun Wu, Daniel Erni, Ke Wu, Jong-Chul Lee
IEEE Transactions on Microwave Theory and Techniques
Volume: 60, Issue: 10, October 2012
3013 - 3022
Electromagnetically induced transparency (EIT), metamaterial, polarization independent, refractive index, sensor
A polarization-independent metamaterial analog of
electromagnetically induced transparency (EIT) at microwave
frequencies for normal incidence and linearly polarized waves is
experimentally and numerically demonstrated. The metamaterial
consists of coupled “bright” split-ring resonators (SRRs) and
“dark” spiral resonators (SRs) with virtually equal resonance
frequencies. Normally incident plane waves with linear polarization
strongly couple to the SRR, but are weakly interacting with
the SR, regardless of the polarization state. A sharp transmission
peak (i.e., the transparency window) with narrow spectral width
and slow wave property is observed for the metamaterial at the
resonant frequency of both, the bright SRR and the dark SR.
The influence of the coupling strength between the SRR and SR on the frequency, width, magnitude, and quality factor of the
metamaterial’s transparency window is theoretically predicted by a two-particle model, and numerically validated using full-wave
electromagnetic simulation. In addition, it is numerically demonstrated that the EIT-like metamaterial can be employed as a
refractive-index-based sensor with a sensitivity of 77.25 mm/RIU,
which means that the resonance wavelength of the sensor shifts
77.25 mm per unit change of refractive index of the surrounding
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