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Effect of bias electrode position on terahertz radiation from pentagonal mesas of superconducting Bi2Sr2CaCu2O8+δ

Effect of bias electrode position on terahertz radiation from pentagonal mesas of superconducting Bi2Sr2CaCu2O8+δ
Effect of bias electrode position on terahertz radiation from pentagonal mesas of superconducting Bi2Sr2CaCu2O8+δ
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- 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.
505-511
Delfanazari, Kaveh
e538911f-2398-4d3f-952f-ff2d908213b0
Asai, Hidehiro
a186c626-7e42-4d09-a1bb-f57bba607c6b
Tsujimoto, Manabu
1e1aa66b-968e-40bc-a795-44f49f6eb9f7
Kashiwagi, Takanari
1b930d98-b13b-48d3-b04c-53f771c1f942
Kitamura, Takeo
72e532e8-14ae-4ad7-b6ea-ed93c12dca53
Yamamoto, Takashi
dc5e1771-ed9e-4659-9db4-1eb01b329464
Wilson, Wade
493261f8-97a8-4674-b2ca-6fffb73487d9
Klemm, Richard A.
37b2e4f8-e8be-4eb7-a534-b4270c28e788
Hattori, Toshiaki
605e50d6-6f1a-432d-b44a-eb46c0c1d834
Kadowaki, Kazuo
1139b03f-977e-4c82-aa31-d6bd1c001d05
Delfanazari, Kaveh
e538911f-2398-4d3f-952f-ff2d908213b0
Asai, Hidehiro
a186c626-7e42-4d09-a1bb-f57bba607c6b
Tsujimoto, Manabu
1e1aa66b-968e-40bc-a795-44f49f6eb9f7
Kashiwagi, Takanari
1b930d98-b13b-48d3-b04c-53f771c1f942
Kitamura, Takeo
72e532e8-14ae-4ad7-b6ea-ed93c12dca53
Yamamoto, Takashi
dc5e1771-ed9e-4659-9db4-1eb01b329464
Wilson, Wade
493261f8-97a8-4674-b2ca-6fffb73487d9
Klemm, Richard A.
37b2e4f8-e8be-4eb7-a534-b4270c28e788
Hattori, Toshiaki
605e50d6-6f1a-432d-b44a-eb46c0c1d834
Kadowaki, Kazuo
1139b03f-977e-4c82-aa31-d6bd1c001d05

Delfanazari, Kaveh, Asai, Hidehiro, Tsujimoto, Manabu, Kashiwagi, Takanari, Kitamura, Takeo, Yamamoto, Takashi, Wilson, Wade, Klemm, Richard A., Hattori, Toshiaki and Kadowaki, Kazuo (2015) Effect of bias electrode position on terahertz radiation from pentagonal mesas of superconducting Bi2Sr2CaCu2O8+δ. IEEE Transactions on Terahertz Science and Technology, 5 (3), 505-511. (doi:10.1109/TTHZ.2015.2409552).

Record type: Article

Abstract

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- 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.

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More information

Accepted/In Press date: 20 February 2015
e-pub ahead of print date: 19 March 2015
Published date: May 2015
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 378425
URI: https://eprints.soton.ac.uk/id/eprint/378425
PURE UUID: f00ac041-51ed-4e7a-8935-0d16775af8cf

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Date deposited: 29 Jun 2015 11:12
Last modified: 19 Nov 2018 17:31

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Contributors

Author: Kaveh Delfanazari
Author: Hidehiro Asai
Author: Manabu Tsujimoto
Author: Takanari Kashiwagi
Author: Takeo Kitamura
Author: Takashi Yamamoto
Author: Wade Wilson
Author: Richard A. Klemm
Author: Toshiaki Hattori
Author: Kazuo Kadowaki

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