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Tunable terahertz emission from the intrinsic Josephson junctions in acute isosceles triangular Bi<inf>2</inf>Sr<inf>2</inf>CaCu<inf>2</inf>O <inf>8+δ</inf> mesas

Delfanazari, K and Asai, H and Tsujimoto, M and Kashiwagi, T and Kitamura, T and Yamamoto, T and Sawamura, M and Ishida, K and Watanabe, C and Sekimoto, S and Minami, H and Tachiki, M and Klemm, RA and Hattori, T and Kadowaki, K (2013) Tunable terahertz emission from the intrinsic Josephson junctions in acute isosceles triangular Bi<inf>2</inf>Sr<inf>2</inf>CaCu<inf>2</inf>O <inf>8+δ</inf> mesas. Optics Express, 21. pp. 2171-2184.

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Abstract

In order to determine if the mesa geometry might affect the properties of the coherent terahertz (THz) radiation emitted from the intrinsic Josephson junctions in mesas constructed from single crystals of the high-temperature superconductor, Bi2Sr2CaCu2O 8+δ, we studied triangular mesas. For equilateral triangular mesas, the observed emission was found to be limited to the single mesa TM(1,0) mode. However, tunable radiation over the range from 0.495 to 0.934 THz was found to arise from an acute isosceles triangular mesa. This 47% tunability is the widest yet observed from the outer current-voltage characteristic branch of such mesas of any geometry. Although the radiation at a few of the frequencies in the tunable range appear to have been enhanced by cavity resonances, most frequencies are far from such resonance frequencies, and can only be attributed to the ac-Josephson effect. © 2013 Optical Society of America.

Item Type: Article
Uncontrolled Keywords: Ceramics Equipment Design Equipment Failure Analysis Lighting Semiconductors Terahertz Radiation
Subjects: UNSPECIFIED
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 12:54
DOI: 10.1364/OE.21.002171