Chance discovery of terahertz waveguides by US research group

Abstract

PurposeThis paper describes the discovery of waveguides capable of transmitting electromagnetic radiation at terahertz (THz) frequencies. Until now this has not been possible, despite extensive research.Design/methodology/approachThe discovery was made by a research group at Rice University whilst working on apertureless, near‐field THz microscopy. By chance, the group found that bare metal wires are capable of transmitting THz radiation to and from remote samples with virtually no dispersion and little attenuation.FindingsThis discovery allows THz waves to be taken directly to and from the source and detector and eliminates the need for objects to be positioned directly in the THz beam. It also overcomes problems associated with shock and vibration. Subsequently, the group used this phenomenon to develop the world's first prototype THz‐frequency endoscope, which was used to examine a glass flask.Originality/valueThe availability of THz waveguides will allow many new applications to be realised. A major use is expected to be security, where systems could be used for checking passengers and baggage at airports, etc. for concealed weapons, drugs and explosives. Uses in product quality control and healthcare are also anticipated.