Just want to confirm if my understanding is correct regarding the detection method of terahertz radiation using superconducting tunnel junctions (a Superconductor-Insulator-Superconductor device). For a Niobium superconductor material (having Eg = 3meV corresponding to about 0.7 THz frequency from E=hv, where v is the frequency) all I need is about 0.7 THz of electromagnetic wave to incident on this superconducting tunnel junction detector in order for the electrons (Cooper pairs breaking up) to tunnel through the insulator and in to the other superconductor. Is my understanding correct? Please help! Thank you!