Photonics Research, Volume. 5, Issue 6, 571(2017)
Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators
Fig. 1. 3D schematic drawing of the proposed metamaterial sensor and a single enlarged unit cell with its geometrical dimensions. The inset shows the polarization of the EM wave illumination. The electric field component is vertical to the gap of the DVSRRs. The magnetic field is normal to the DVSRR. The EM wave illuminates from the top perpendicularly. The geometric parameters of a single DVSRR unit cell are
Fig. 2. Comparison of the transmission spectra of three different VSRRs that share the same dimensions, except for the positions and number of gaps. The TVSRR and BVSRR display the VSRRs with one slot in the top or bottom metal plate, respectively.
Fig. 3. Comparison of the numerically calculated distributions of the three VSRR structures at resonant frequencies, namely 0.9853, 0.7305, and 1.5102 THz for TVSRR, BVSRR, and DVSRR respectively. (a), (d), and (g) illustrate the surface current distributions for the three VSRRs. The black arrows denote the directions of surface electric current. (b), (e), and (h) show the magnetic energy density distributions. The electric energy density distributions are also shown in (c), (f), and (i). The electric energy density in the lower gap of the DVSRR is enlarged and demonstrated in the red dotted line box in the inset of (i).
Fig. 4. (a) 3D sketch diagram of the sensing configuration including the DVSRR’s array sensor and analyte. The sensing performance based on the thicknesses and RIs of the analyte are shown in the following subgraphs. (b) The transmission spectra of the DVSRR with and without analyte overlaid on the sensor. Analytes with the different thicknesses (
Fig. 5. Comparative plots of (a) thickness sensing with fixed RI of
Fig. 6. (a) 3D schematic drawing of the transmission spectral comparison for various DVSRR structures with fabrication tolerance ranging from
Fig. 7. Transmission spectral comparison for (a) TM and (b) TE incidence radiation with increasing incidence angles with a step of 10°. The polarizations of the two incidence radiations are shown as the insets in (a) and (b).
Fig. 8. 3D bar plots shows the evolution of the sensing performance of the DVSRR for a wide range of incidence angles (0°–50°) and the increasing RI (1.2–2) with fixed thickness
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Wei Wang, Fengping Yan, Siyu Tan, Hong Zhou, Yafei Hou, "Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators," Photonics Res. 5, 571 (2017)
Category: Metamaterials
Received: Jul. 7, 2017
Accepted: Sep. 13, 2017
Published Online: Dec. 7, 2017
The Author Email: Fengping Yan (fpyan@bjtu.edu.cn)