Summary: Resonant Terahertz Radiation from Layered
Superconductors: Mechanisms of Damping and
Structure of Dynamic States
A. E. Koshelev 1 and L. N. Bulaevskii 2
Abstract. Intrinsic Josephson-junction stacks realized in high-temperature superconductors
may generate powerful electromagnetic radiation in terahertz frequency range. A major
challenge is to synchronize phase oscillations in many junctions. A promising way of efficient
synchronization is to excite an internal cavity mode, with the frequency set by the stack lateral
size. We discuss several issues relevant for this mechanism: (i) damping of the resonance mode
due to radiation into free space and into the base crystal, (ii) mechanisms of coupling to the
internal mode, (iii) structures and stability of coherent states.
Materials Science Division, Argonne National Laboratory, Argonne, Illinois, 60439, USA,
Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA
Large density of intrinsic Josephson junctions and large value of the gap in Bi2Sr2CaCu2O8
(BSCCO) and other related high-Tc superconducting compounds make them very attractive for
developing coherent sources of electromagnetic radiation in the terahertz frequency range .