CUED Publications database

Terahertz oscillating devices based upon the intrinsic josephson junctions in a high temperature superconductor

Delfanazari, K and Asai, H and Tsujimoto, M and Kashiwagi, T and Kitamura, T and Ishida, K and Watanabe, C and Sekimoto, S and Yamamoto, T and Minami, H and Tachiki, M and Klemm, RA and Hattori, T and Kadowaki, K (2014) Terahertz oscillating devices based upon the intrinsic josephson junctions in a high temperature superconductor. Journal of Infrared, Millimeter, and Terahertz Waves, 35. pp. 131-146. ISSN 1866-6892

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Recent developments of coherent terahertz (THz) oscillators based on the intrinsic Josephson junctions (IJJs) in mesas of the high temperature superconductor Bi2Sr2CaCu2O8+δ are reviewed. Experimental and theoretical studies of the emission from equilateral, right-angled isosceles, and acute isosceles triangular mesas are compared with those obtained from rectangular, square, and disk mesas, in order to determine the role of the mesa geometry. The superconducting properties and emission frequency f spectra are presented for a variety of triangular mesa geometries. Analytic and finite difference time domain numerical calculations of the emissions from the internal electromagnetic (EM) cavity modes of triangular mesas are compared with experiment. The experimental f always satisfies the ac Josephson relation, and its narrow linewidth arises from the synchronized emissions from many IJJs. For some mesa geometries, f also strongly locks onto an EM cavity mode frequency, enhancing the emission's stability and output power. For other geometries, such cavity mode locking is weak, and f is highly tunable. © Springer Science+Business Media New York 2013.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:00
Last Modified: 19 Nov 2020 11:46
DOI: 10.1007/s10762-013-0027-y