Efficient fabrication of intrinsic-Josephson-junction terahertz oscillators with greatly reduced self-heating effects

Kashiwagi, T., Yamamoto, T., Minami, H., Tsujimoto, M., Yoshizaki, R., Delfanazari, K., Kitamura, T., Watanabe, C., Nakade, K., Yasui, T., Asanuma, K., Saiwai, Y., Shibano, Y., Enomoto, T., Kubo, H., Sakamoto, K., Katsuragawa, T., Markovic, B., Mirkovic, J., Klemm, R. A. and Kadowaki, K. (2015) Efficient fabrication of intrinsic-Josephson-junction terahertz oscillators with greatly reduced self-heating effects. Physical Review Applied, 4 (5), 1-16, [054018]. (doi:10.1103/PhysRevApplied.4.054018).

Abstract

The intrinsic Josephson junctions (IJJs) in the high-T_c superconductor Bi₂Sr₂CaCu₂O_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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