Study on asymmetric terahertz metamaterials for biosensing

Wanlin Liang; Qingli Zhou; Ge Li; Cunlin Zhang

doi:10.1117/12.2502511

9 November 2018 Study on asymmetric terahertz metamaterials for biosensing

Wanlin Liang, Qingli Zhou, Ge Li, Cunlin Zhang

Proceedings Volume 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V; 108261Q (2018) https://doi.org/10.1117/12.2502511
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

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.

Citation Download Citation

Wanlin Liang, Qingli Zhou, Ge Li, and Cunlin Zhang "Study on asymmetric terahertz metamaterials for biosensing", Proc. SPIE 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V, 108261Q (9 November 2018); https://doi.org/10.1117/12.2502511

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