Authors

K. Delfanazari; H. Asai; M. Tsujimoto; T. Kashiwagi; T. Kitamura; T. Yamamoto; M. Sawamura; K. Ishida; C. Watanabe; S. Sekimoto; H. Minami; M. Tachiki; R. A. Klemm; T. Hattori;K. Kadowaki

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Abbreviated Journal Title

Opt. Express

Keywords

SINGLE-CRYSTALS; THZ EMITTERS; T-C; RADIATION; OPERATION; WAVES; POWER; Optics

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, Bi2Sr2CaCu2O8+delta, 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.

Journal Title

Optics Express

Volume

21

Issue/Number

2

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

2171

Last Page

2184

WOS Identifier

WOS:000315989500081

ISSN

1094-4087

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