Efficient Fabrication of Intrinsic-Josephson-Junction Terahertz Oscillators with Greatly Reduced Self-Heating Effects

T. Kashiwagi, T. Yamamoto, H. Minami, M. Tsujimoto, R. Yoshizaki, K. Delfanazari, T. Kitamura, C. Watanabe, K. Nakade, T. Yasui, K. Asanuma, Y. Saiwai, Y. Shibano, T. Enomoto, H. Kubo, K. Sakamoto, T. Katsuragawa, B. Marković, J. Mirković, R. A. Klemm, and K. Kadowaki

Phys. Rev. Applied 4, 054018 – Published 30 November 2015

Abstract

The intrinsic Josephson junctions (IJJs) in the high- $T_{c}$ superconductor ${Bi}_{2} {Sr}_{2} {CaCu}_{2} O_{8 + δ}$ (Bi2212) are shown to have great potential for the construction of an oscillator emitting in the terahertz-frequency $f$ regime. However, earlier devices with Bi2212 substrates exhibit strong self-heating effects detrimental to their operation and limiting the maximum $f$ to approximately 1 THz. Here we describe an efficient fabrication procedure for a stand-alone-mesa IJJ terahertz oscillator with considerably reduced self-heating effects, greatly expanding the tunability and maximum value of $f$ , potentially even to 15 THz. Their typical current-voltage characteristics, radiation tunability and power, and some practical uses are also presented.

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Received 15 May 2015

DOI:https://doi.org/10.1103/PhysRevApplied.4.054018

Authors & Affiliations

T. Kashiwagi^1,2, T. Yamamoto³, H. Minami^1,2, M. Tsujimoto⁴, R. Yoshizaki^1,2, K. Delfanazari⁵, T. Kitamura¹, C. Watanabe¹, K. Nakade¹, T. Yasui¹, K. Asanuma¹, Y. Saiwai¹, Y. Shibano¹, T. Enomoto¹, H. Kubo¹, K. Sakamoto¹, T. Katsuragawa¹, B. Marković⁶, J. Mirković^6,7, R. A. Klemm⁸, and K. Kadowaki^1,2

¹Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan
²Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan
³Institute for Quantum Optics and Center for Integrated Quantum Science and Technology, Ulm University, Ulm D-89081, Germany
⁴Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
⁵Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom
⁶Faculty of Sciences, University of Montenegro, George Washington Street, 81000 Podgorica, Montenegro
⁷Faculty of Science, University of Montenegro, and CETI, Put Radomira Ivanovica, 81000 Podgorica, Montenegro
⁸Department of Physics, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816-2385, USA

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Vol. 4, Iss. 5 — November 2015

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