Wanlin Liang, Qingli Zhou, Ge Li, Cunlin Zhang
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10826/108261Q/Study-on-asymmetric-terahertz-metamaterials-for-biosensing/10.1117/12.2502511.short
Recently, the terahertz biosensors based on
metamaterials have attracted much attention due to the fact that metamaterials
are sensitive to the local enhancement of electromagnetic field and the changes
of the surrounding dielectric environment. In order to obtain the resonances
with the high quality factor for biosensing, here we designed, simulated, and
fabricated the metamaterial structures composed of a series of the asymmetric
“double” circular arc (DASR) structures. The experimental data show there are
three sharp resonance dips named Fano resonance in the terahertz transmission
spectra. In the previous study of asymmetric double rings, we studied the
effect of different cutting widths on the transmission characteristics of
terahertz when the samples were placed at 0 degrees. Here, the spectral
characteristics and polarization conversion characteristics of the samples
after 90 degrees were studied. We found that when the sample rotated by 90
degrees only two resonance dips exist in the transmission spectrum. As the
separation of asymmetric arcs gradually increases, two resonance frequencies
also show blue-shift. To further analyze the reasons for the changes in the
transmission spectrum at different angles of sample placement, we present the
surface currents and the electromagnetic field distributions in those
structures. Our obtained results indicate the terahertz metamaterial has great
potential in application of biosensing field.
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