Generation of electromagnetic waves from 0.3 to 1.6 terahertz with a high- T_c superconducting Bi₂Sr₂CaCu₂O_8+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. and Kadowaki, Kazuo (2015) Generation of electromagnetic waves from 0.3 to 1.6 terahertz with a high- T_c superconducting Bi₂Sr₂CaCu₂O_8+δ intrinsic Josephson junction emitter. Applied Physics Letters, 106 (9), [092601]. (doi:10.1063/1.4914083).

Abstract

To obtain higher power P and frequency f emissions from the intrinsic Josephson junctions in a high-T_c superconducting Bi₂Sr₂CaCu₂O_8+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 T_b, f is tunable from 0.3 to 1.6THz. The maximum P of a few tens of µW, an order of magnitude greater than from previous devices, was found at T_b ~55K on an inner I-V branch at the TM(1,0) cavity resonance mode frequency. The highest f of 1.6THz was found at T_b=10K on an inner I-V branch, but away from cavity resonance frequencies. A possible explanation is presented.

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