Yuanyuan Li, Xieyu Chen, Fangrong Hu, Dongxia Li, Huan Teng, Qi Rong, Wentao zhang, Jiaguang Han, Huasheng Liang
http://iopscience.iop.org/article/10.1088/1361-6463/aaf7e9
A terahertz (THz) metamaterial biosensor based on four identical resonators is experimentally demonstrated, and high sensitivity is achieved by exciting four synchronous LC oscillations in a unit cell. The effect of geometries on the resonance frequency of the sensor is investigated using finite integration time domain (FIDT) method, and the simulated sensitivity is 85 GHz per refractive index unit (RIU). The biosensor sample is fabricated using a surface micromachining process and characterized by a THz time domain spectroscopy (TDS) system combined with bovine serum albumin (BSA) solution as anelyte. The experimental results indicate that the resonance frequency shows distinct redshift when increases the concentration of BSA solution. When the concentration is high up to 765μmol/L, the frequency shift reaches 50 GHz, and the measurable minimum concentration is low to 1.5μmol/L. The biosensor is small in shape, wide in measurable range, convenient in operation and rapid in detection, which is of great significance for rapid concentration measurement, biomolecules detection and disease diagnosis.
