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Title: Terahertz wave emission from intrinsic Josephson junctions in high- Tc superconductors
Authors: Özyüzer, Lütfi
Şimşek, Yılmaz
Köseoğlu, Hasan
Türkoğlu, Fulya
Kurter, Cihan
Welp, U.
Koshelev, A. E.
Gray, Kenneth E.
Kwok, W. K.
Yamamoto, T.
Kadowaki, K.
Koval, Yu I.
Wang, Huabing
Müller, Paul H.
Keywords: Current voltage characteristics
Ac Josephson effect
Terahertz (THz) waves
UV lithography
Oxygen doping
Josephson junction devices
Issue Date: 2009
Publisher: IOP Publishing Ltd.
Source: Özyüzer, L., Şimşek, Y., Köseoğlu, H., Türkoğlu, F., Kurter, C., Welp, U., Koshelev, A.E., Gray, K.E., Kwok, W.K., Yamamoto, T., Kadowaki, K., Koval, Y., Wang, H.B., and Müller, P. (2009). Terahertz wave emission from intrinsic Josephson junctions in high- Tc superconductors. Superconductor Science and Technology, 22(11). doi:10.1088/0953-2048/22/11/114009
Abstract: Recently, we experimentally demonstrated that rectangular mesa structures of intrinsic Josephson junctions (IJJ) in Bi2Sr2CaCu 2O8+d (Bi2212) can be used as a compact solid-state generator of continuous, coherent and polarized terahertz (THz) radiation. In the present work, we will exhibit tall mesas (over 600 junctions) which were fabricated using UV lithography, e-beam lithography with photoresist and e-beam lithography with a Ti selective etching technique. We will present measurements of the c-axis resistance as a function of temperature and of current-voltage characteristics of THz emitting mesas with lateral sizes ranging from 30 × 300 to 100 × 300νm2. Furthermore, we will discuss the dependence of the characteristics of the mesa structures on the oxygen doping level of the Bi2212 crystals. We will also experimentally show that the voltage-frequency relation of the ac Josephson effect has to match the cavity resonance for successful emission.
ISSN: 0953-2048
Appears in Collections:Physics / Fizik
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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