CUED Publications database

(Invited) Cavity mode enhancement of terahertz emission from equilateral triangular and pieshaped wedge microstrip antennas of the high-temperature superconductor Bi2Sr2CaCu2O8+δ

Klemm, R and Cerkoney, D and Doty, C and Gramajo, A and Wang, Q and Campbell, T and Morales, M and Reid, C and Delfanazari, K and Tsujimoto, M and Yamamoto, T and Kashiwagi, T and Watanabe, C and Minami, H and Kadowaki, K (2016) (Invited) Cavity mode enhancement of terahertz emission from equilateral triangular and pieshaped wedge microstrip antennas of the high-temperature superconductor Bi2Sr2CaCu2O8+δ. In: The 10th International Symposium on Intrinsic Josephson Effects and Plasma Oscillations in High-Tc Superconductors (Plasma+ 2016), -- to --, Nanjing, China.

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Abstract

We study the transverse magnetic (TM) electromagnetic cavity modes wave functions for ideal equilateral triangular and pie-shaped wedge microstrip antennas (MSAs), assuming perfect thermal management and perfect shape construction, such as could possibly be produced with improved versions of “stand-alone mesa sandwich structures” [1]. We use the two-source model for the emissions [2], the uniform Josephson current source and the magnetic surface current source driven by the displacement current. For perfect equilateral triangular MSAs obeying C3v point group symmetry, most cavity modes vanish, and both contributions to the output power from the non-vanishing cavity modes have angular dependencies obeying C6 symmetry. The power distribution from an earlier (conventional mesa) sample with emissions having lower symmetry are fit by assuming the C3v wave function symmetry is broken by a hot spot, yielding one or more of the symmetry-forbidden TM(1,0) modes [3]. Wedge MSAs with only one mirror plane have output power distributions obeying C2 symmetry. The wave functions and two-source power distributions from wedge MSAs with a variety of wedge angles φ0 are calculated, and the emissions from the TMo(2,0) mode are fit with the two-source model [3]. In both cases of fitting to the emissions from earlier conventional mesa form of MSAs, the superconducting substrate was treated as a perfect magnetic conductor, which was necessary due to its poor thermal conductivity [2]. References [1] T. Kashiwagi et al., Phys. Rev. Applied 4, 054018 (2015). [2] R. A. Klemm and K. Kadowaki, J. Phys.: Condens. Matter 22, 375701 (2010). [3] K. Delfanazari et al., Opt. Express 21, 2171 (2013).

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: Transverse magnetic cavity resonances, terahertz radiation, intrinsic Josephson junctions, equilateral triangular microstrip antennas, pie-shaped wedge microstrip antennas
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 20:09
Last Modified: 10 Aug 2017 01:35
DOI: