> It beats infrared light for resolving power because it suffers less Rayleigh scattering, imaging details less than 1 millimetre wide. While the wavelength of

> It beats infrared light for resolving power because it suffers less Rayleigh scattering, imaging details less than 1 millimetre wide. While the wavelength of THz is larger than IR, and hence leads to a worse spatial resolution due to diffraction. This comment is about the scattering of light through a medium, which acts as a low pass filter leading to loss of higher spatial frequencies and therefore lower spatial resolution. > millimetre wave astronomy is a big topic of the last decade or two. How does the THz technology described here link to what's used in mm wave detection? They are effecitevely the same band (1mm ~ 0.3THz). The difference between astronomy and other applications is photon flux. Distant astronomical objects are faint, therefore detection methods only need to detect a small number of photons/s. One popular detector is cryogenic bolometers, which measure a temperature increase due to absorbed energy from a THz photon. These work well in low-flux applications.