Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/24299
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dc.contributor.authorKashiwagi, T.-
dc.contributor.authorKubo, H.-
dc.contributor.authorSakamoto, K.-
dc.contributor.authorYuasa, T.-
dc.contributor.authorTanabe, Y.-
dc.contributor.authorWatanabe, C.-
dc.contributor.authorTanaka, T.-
dc.contributor.authorKomori, Y.-
dc.contributor.authorOta, R.-
dc.contributor.authorKuwano, G.-
dc.contributor.authorNakamura, K.-
dc.contributor.authorKatsuragawa, T.-
dc.contributor.authorTsujimoto, M.-
dc.contributor.authorYAMAMOTO, Takashi-
dc.contributor.authorYoshizaki, R.-
dc.contributor.authorMinami, H.-
dc.contributor.authorKadowaki, K.-
dc.contributor.authorKlemm, R. A.-
dc.date.accessioned2017-08-30T09:19:52Z-
dc.date.available2017-08-30T09:19:52Z-
dc.date.issued2017-
dc.identifier.citationSUPERCONDUCTOR SCIENCE & TECHNOLOGY, 30(7), p. 1-11 (Art N° 074008)-
dc.identifier.issn0953-2048-
dc.identifier.urihttp://hdl.handle.net/1942/24299-
dc.description.abstractA terahertz (THz) wave emitter using the stack of intrinsic Josephson junctions present in the high-Tc superconductor Bi2Sr2CaCu2O8+delta (Bi2212) has been developed. By applying a dc voltage V across the stack, the ac-Josephson effect converts this to an ac-current that emits photons at the Josephson frequency proportional to V. The Bi2212 device also behaves as and electromagnetic (EM) cavity, so depending upon the shape of the Bi2212 crystal, when the Josephson frequency matches that of a cavity resonance, the emission power is enhanced. However, the EM radiation characteristics also strongly depend upon the effects of Joule self heating of the device. In order to alleviate this Joule heating problem, we fabricated three distinct stand-alone Bi2212 sandwich device shapes, each crystal being first covered with Au on its top and bottom, and then sandwiched between sapphire plates. From our comparative studies of the three devices, we obtained important clues that could help to increase the emission power up to similar to mW and the frequency range up to several THz, as necessary for many applications such as security screening, high speed communications, medical and biological sensing, and astronomical detection, etc.-
dc.description.sponsorshipThis study is supported by the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research(A) No. 15H01996. A part of this study was supported by the Futaba Electronics Memorial Foundation. TK is also supported by the Japan Society for the Promotion of Science Grant-in-Aid for Young Scientists(B) No. 15K20897. We thank all staff members of the Central Workshop at the University of Tsukuba for machining support.-
dc.language.isoen-
dc.publisherIOP PUBLISHING LTD-
dc.rights© 2017 IOP Publishing Ltd Printed in the UK-
dc.subject.otherTHz; high-T-c superconductor; intrinsic Josephson junction-
dc.subject.otherTHz; high-T-c superconductor; intrinsic Josephson junction-
dc.titleThe present status of high-T-c superconducting terahertz emitters-
dc.typeJournal Contribution-
dc.identifier.epage11-
dc.identifier.issue7-
dc.identifier.spage1-
dc.identifier.volume30-
local.format.pages10-
local.bibliographicCitation.jcatA1-
dc.description.notes[Kashiwagi, T.; Kubo, H.; Sakamoto, K.; Yuasa, T.; Tanabe, Y.; Watanabe, C.; Tanaka, T.; Komori, Y.; Ota, R.; Kuwano, G.; Nakamura, K.; Katsuragawa, T.; Tsujimoto, M.; Yoshizaki, R.; Minami, H.; Kadowaki, K.] Univ Tsukuba, Grad Sch Pure & Appl Sci, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058571, Japan. [Kashiwagi, T.; Tsujimoto, M.; Yoshizaki, R.; Minami, H.; Kadowaki, K.] Univ Tsukuba, Fac Pure & Appl Sci, Div Mat Sci, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058571, Japan. [Yamamoto, T.] Hasselt Univ, Inst Mat Res IMO, Wetenschapspk 1, B-3590 Diepenbeek, Belgium. [Klemm, R. A.] Univ Cent Florida, Dept Phys, 4111 Libra Dr, Orlando, FL 32816 USA.-
local.publisher.placeBRISTOL-
local.type.refereedRefereed-
local.type.specifiedArticle-
local.bibliographicCitation.artnr074008-
dc.identifier.doi10.1088/1361-6668/aa6dd7-
dc.identifier.isi000403346400006-
item.accessRightsRestricted Access-
item.validationecoom 2018-
item.fulltextWith Fulltext-
item.fullcitationKashiwagi, T.; Kubo, H.; Sakamoto, K.; Yuasa, T.; Tanabe, Y.; Watanabe, C.; Tanaka, T.; Komori, Y.; Ota, R.; Kuwano, G.; Nakamura, K.; Katsuragawa, T.; Tsujimoto, M.; YAMAMOTO, Takashi; Yoshizaki, R.; Minami, H.; Kadowaki, K. & Klemm, R. A. (2017) The present status of high-T-c superconducting terahertz emitters. In: SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 30(7), p. 1-11 (Art N° 074008).-
item.contributorKashiwagi, T.-
item.contributorKubo, H.-
item.contributorSakamoto, K.-
item.contributorYuasa, T.-
item.contributorTanabe, Y.-
item.contributorWatanabe, C.-
item.contributorTanaka, T.-
item.contributorKomori, Y.-
item.contributorOta, R.-
item.contributorKuwano, G.-
item.contributorNakamura, K.-
item.contributorKatsuragawa, T.-
item.contributorTsujimoto, M.-
item.contributorYAMAMOTO, Takashi-
item.contributorYoshizaki, R.-
item.contributorMinami, H.-
item.contributorKadowaki, K.-
item.contributorKlemm, R. A.-
crisitem.journal.issn0953-2048-
crisitem.journal.eissn1361-6668-
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