Scientists have developed a new way to create Terahertz waves (T-rays) that may one day lead to biomedical detective devices similar to the ‘tricorder’ scanner used in Star Trek. Scientists have developed a new way to create electromagnetic Terahertz (THz) waves or T-rays -- the technology behind full-body security scanners. The researchers behind the study, published recently in the journal Nature Photonics, say their new stronger and more efficient continuous wave T-rays could be used to make better medical scanning gadgets and may one day lead to innovations similar to the ‘tricorder’ scanner used in Star Trek.