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.
- Kadowaki, K.
Publication date
November 2015
DOI Publisher
American Physical Society (APS)Abstract
The intrinsic Josephson junctions (IJJs) in the high-Tc superconductor Bi2Sr2CaCu2O8+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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