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Effect of bias electrode position on terahertz radiation from pentagonal mesas of superconducting Bi<inf>2</inf>Sr<inf>2</inf>CaCu<inf>2</inf>O<inf>8+δ</inf>

Delfanazari, K and Asai, H and Tsujimoto, M and Kashiwagi, T and Kitamura, T and Yamamoto, T and Wilson, W and Klemm, RA and Hattori, T and Kadowaki, K (2015) Effect of bias electrode position on terahertz radiation from pentagonal mesas of superconducting Bi<inf>2</inf>Sr<inf>2</inf>CaCu<inf>2</inf>O<inf>8+δ</inf>. IEEE Transactions on Terahertz Science and Technology, 5. pp. 505-511. ISSN 2156-342X

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Abstract

© 2011-2012 IEEE. We examined the effect of the bias current position on the radiation of intense and coherent terahertz electromagnetic waves from the intrinsic Josephson junctions (IJJs) in regular pentagonal mesas of single crystalline high-Tc superconducting Bi2Sr2CaCu2O8+δ. The emission from Sample 1, a mesa with a current bias feed on its middle, is strong and sharply peaked at 0.47 THz, whereas that from Sample 2, a mesa with its feed along an edge, shows a comparably strong, sharp peak at 0.43 THz. The common backbending in the current-voltage characteristics due to Joule heating was seen for Sample 1 but almost not for Sample 2. The experimental results are in good agreement with numerical simulations and calculations, both for the cavity resonances and the angular emission patterns. The resonance peaks obtained from these pentagonal mesas are both stronger and narrower than those found previously from differently shaped mesas fabricated by focused ion beam milling. The overall devices are small enough to be cooled to their operational temperatures by Stirling refrigerators, so that properly designed devices could be held in one hand as for laser pointers. Therefore, our IJJ-based emitter devices are promising candidates to fill the THz gap with compact, continuous-wave quantum solid-state sources.

Item Type: Article
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 11:41
DOI: 10.1109/TTHZ.2015.2409552