Terahertz wave emission from intrinsic Josephson junctions in high- Tc superconductors
| Autor: | Kazuo Kadowaki, H. Koseoglu, Cihan Kurter, Y. Koval, Wai-Kwong Kwok, Alexei Koshelev, Kenneth E. Gray, Ulrich Welp, Y. Simsek, Takashi Yamamoto, Paul Müller, Huabing Wang, Lutfi Ozyuzer, Fulya Türkoğlu |
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| Přispěvatelé: | TR5135, TR190057, Özyüzer, Lütfi, Köseoğlu, Hasan, Türkoğlu, Fulya, Izmir Institute of Technology. Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Josephson effect
Materials science UV lithography Terahertz radiation Photoresist law.invention Terahertz (THz) waves Etching (microfabrication) law Materials Chemistry Electrical and Electronic Engineering Lithography Superconductivity Ac Josephson effect Oxygen doping Condensed matter physics business.industry Metals and Alloys Josephson junction devices Condensed Matter Physics Current voltage characteristics Ceramics and Composites Optoelectronics Photolithography business Electron-beam lithography |
| Popis: | 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. TÜBİTAK project no. 108T238 and US Department of Energy, Basic Energy Sciences-Materials Sciences, under contract no. DE-AC02-06CH11357 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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