Fig. 1. (a) THz characteristic spectrum of MI; (b) THz characteristic spectrum of GABA. The error bars are marked on the curves in blue

Fig. 2. (a) Structure parameters of THz resonant ring chip; (b) Structure multiple layout drawings; (c) Theoretical map data; (d) The normalized electric field distribution calculating by COMSOL

Fig. 3. Physical test of THz resonant ring chip. (a) Partial structural photos of metamaterial chip under microscope (200×); (b) THz spectrum measured by the chip. The error bar is marked on the curve in grey

Fig. 4. Testing results of MI. (a) Terahertz spectra of MI covered metamaterial chips with different concentrations; (b) The change of formant frequency shift of chip under different concentration of MI. The error bars are marked on the curves/points

Fig. 5. Testing results of GABA. (a) Terahertz spectra of metamaterial chips covered with different concentrations of GABA; (b) The change of formant frequency shift of chip under different concentrations of GABA.The error bars are marked on the curves/points