Terahertz emission from thin annular and slitted annular Bi2212 microstrip antennas

The transverse magnetic wave functions generated from the intrinsic Josephson junctions in the high-temperature superconductor Bi2212 are found for annular and singly slitted microstrip antennas. From the wave functions, the Love equivalence principles are used to generate the emission from the uniform and cavity modes (wave functions). For most of the annular wave functions, the infinite degeneracy of the modes with line nodes through the geometric center most likely will result in no cavity mode enhancement of the output power. Forming the slit breaks that infinite degeneracy into a double degeneracy of modes that are odd or even about the slit. Pictures of the wave functions and the uniform and cavity mode contributions to the output power distribution will be shown. The consequences for forming arrays of such devices will be discussed.