Manipulation terahertz wave with electro-rheological fluid

Diverse applications of terahertz technology depend on the efficient manipulation of terahertz beam. Terahertz switch with transmitting electromagnetic intensity tunability is essential for effective control of terahertz wave. Existing approaches are a lack of simple structure able to achieve superior switching performance. Here we experimentally demonstrate a new approach to manipulate terahertz wave transmittance controlled by Calcium and Titanium Precipitate (CTP) electro-rheological (ER) fluid, and develop a novel CTP ER-fluid switch at terahertz frequencies based on this mechanism. In this way, we achieve perfect terahertz wave intensity switching through actively adjusting the external applied electric field. This operating principle ensures that our presented device can operate in terahertz frequency range.