A Novel Terahertz Microfluidic Chip

We fabricate a new terahertz microfluidic chip, which can detect liquid samples using THz-TDS system or asynchronous optical sampling system. The chip has a sandwich structure, and consists of substrate, cover and microchannel layer. The substrate and cover are made of two materials, PMMA and cycloolefin copolymers (COC). The microchannel layer is fabricated by PDMS. Through van der Waals force, the substrate, cover and microchannel layer are sealed together. We use the chip to study the transmission of terahertz to deionized water and the influence of different kinds and concentration of electrolyte solution on hydrogen bond in aqueous solution, and the results prove the feasibility of this method.