firms are also investigating passive systems that only require a detector — in effect a terahertz camera. By working with low frequency T-waves, it is possible to perform 'passive imaging' and ...

1.De Miguel, J., Hernández-Cabrera, J. F., Hernández-Suárez, E., Joven-Álvarez, E., Otani, C., and Rubiño-Martín, J. A.: "Discovery prospects with the Dark ...