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Radiation due to Josephson Oscillations in Layered Superconductors L. N. Bulaevskii1

Summary: Radiation due to Josephson Oscillations in Layered Superconductors
L. N. Bulaevskii1
and A. E. Koshelev2
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
(Received 20 February 2007; published 2 August 2007)
We derive the power of direct radiation into free space induced by Josephson oscillations in intrinsic
Josephson junctions of layered superconductors. We consider the superradiation regime for a crystal cut in
the form of a thin slice parallel to the c axis. We find that the radiation correction to the current-voltage
characteristic in this regime depends only on crystal shape. We show that at a large number of junctions
oscillations are synchronized providing high radiation power and efficiency in the terahertz frequency
range. We discuss the crystal parameters and bias current optimal for radiation power and crystal cooling.
DOI: 10.1103/PhysRevLett.99.057002 PACS numbers: 85.25.Cp, 42.25.Gy, 74.50.+r
Josephson junctions (JJs), as sources of tunable continu-
ous electromagnetic (EM) radiation, were discussed for a
long time after the prediction of the ac Josephson effect [1].
Early measurements [2] demonstrated that emittence from
a single JJ has very low power, typically 106


Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory


Collections: Materials Science; Physics