Generation of electromagnetic waves from 0.3 to 1.6 terahertz with a high- Tc superconducting Bi2Sr2CaCu2O8+δ intrinsic Josephson junction emitter
- Kashiwagi, Takanari
- Yamamoto, Takashi
- Kitamura, Takeo
- Asanuma, Kentaro
- Watanabe, Chiharu
- Nakade, Kurama
- Yasui, Takaki
- Saiwai, Yoshihiko
- Shibano, Yuuki
- Kubo, Hiroyuki
- Sakamoto, Kazuki
- Katsuragawa, Takuya
- Tsujimoto, Manabu
- Delfanazari, Kaveh
- Yoshizaki, Ryozo
- Minami, Hidetoshi
- Klemm, Richard A.
- Kadowaki, Kazuo
DOIAbstract
To obtain higher power P and frequency f emissions from the intrinsic Josephson junctions in a high-Tc superconducting Bi2Sr2CaCu2O8+δ single crystal, we embedded a rectangular stand-alone mesa of that material in a sandwich structure to allow for efficient heat exhaust. By varying the current-voltage (I-V) bias conditions and the bath temperature Tb, f is tunable from 0.3 to 1.6 THz. The maximum P of a few tens of μW, an order of magnitude greater than from previous devices, was found at Tb∼55 K on an inner I-V branch at the TM(1,0) cavity resonance mode frequency. The highest f of 1.6 THz was found at Tb=10 K on an inner I–V branch, but away from cavity resonance frequencies. A possible explanation is presented
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