THz emission from intrinsic josephson junctions in high-Tc superconductors for imaging applications

In 2007 [1], we have succeeded in observing strong, coherent, and continuous THz emission from a mesa of Bi
2
Sr
2
CaCu
2
O
8+s
single crystal with a rectangular dimension of a few hundred micrometers in length, several tens of micrometers in width, and a few micrometers in thickness. Since then, great progress has been made both in understanding the fundamental mechanism of the radiation [2-6] and in practical applications [7-9].