Journal of Superconductivity and Novel Magnetism

, Volume 23, Issue 5, pp 613–616

Angular Dependence of the Radiation Power of a Josephson STAR-emitter

Original Paper

DOI: 10.1007/s10948-010-0719-7

Cite this article as:
Klemm, R.A. & Kadowaki, K. J Supercond Nov Magn (2010) 23: 613. doi:10.1007/s10948-010-0719-7


We calculate the angular dependence of the power of stimulated terahertz amplified radiation (STAR) emitted from a dc voltage applied across a stack of intrinsic Josephson junctions. During coherent emission, we assume that a spatially uniform ac Josephson current density in the stack acts as a surface electric current density antenna source, and the cavity features of the stack are contained in a magnetic surface current density source. A superconducting substrate acts as a perfect magnetic conductor with H||,ac=0 on its surface. The combined results agree very well with recent experimental observations. Existing Bi2Sr2CaCu2O8+δ crystals atop perfect electric conductors could have Josephson STAR-emitter power in excess of 5 mW, acceptable for many device applications.


Terahertz radiationJosephson junctions

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of Central FloridaOrlandoUSA
  2. 2.Graduate School of Pure and Applied SciencesUniversity of TsukubaTsukubaJapan