THz Biosensor Based on Metasurface Integrated with Spintronic Emitter

Currently spintronic THz sources have the advantages of low cost, high efficiency, and easy integration, so it can be used to integrate feature-rich devices. In this paper, we demonstrate the function of THz sensing by metasurface integrated with spintronic THz emitter. Through electromagnetic simulation, the resonant frequency point of metasurface was designed to be around 0.8 THz. Then the metasurface was fabricated on a quartz substrate and shared the substrate with a spintronic emitter. This integrated THz biosensor was used to measure the transmittance spectra of water, alcohol and olive oil. The experimental results show that it is sensitive for identifying different liquids according to the frequency shift.