EurekAlert  July 24, 2019 Current terahertz imaging technologies are expensive to produce and cumbersome to operate. A team of researchers in the US (Princeton University, MIT, University of Notre Dame, Sandia National Laboratory) has demonstrated hyperspectral imaging with chip-scale frequency combs based on terahertz quantum cascade lasers. The dual combs are free-running and emit coherent terahertz radiation that covers a bandwidth of 220 GHz at 3.4 THz with ∼10  μW per line. The combination of the fast acquisition rate of dual-comb spectroscopy with the monolithic design, scalability, and chip-scale size of the combs is highly appealing for future imaging applications in biomedicine […]