Angular Dependence of the Radiation Power of a Josephson STAR-emitter
- 74 Downloads
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.
KeywordsTerahertz radiation Josephson junctions
Unable to display preview. Download preview PDF.
- 5.Millman, J., Halkias, C.C.: Electronic Devices and Circuits. McGraw-Hill, Tokyo (1967) Google Scholar
- 7.Balanis, C.A.: Antenna Theory, Analysis and Design, 3rd edn. Wiley, Hoboken (2005). See Fig. 4.13 Google Scholar
- 13.Klemm, R.A., Kadowaki, K.: arXiv:0807.3082 (2008)
- 14.Klemm, R.A., Kadowaki, K.: arXiv:0908.4104 (2009)