Institute of Materials Science, Graduate School of Pure & Applied Sciences, University of Tsukuba,1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan.
Phys Rev Lett. 2010 Jul 16;105(3):037005. doi: 10.1103/PhysRevLett.105.037005. Epub 2010 Jul 15.
Subterahertz radiation emitted from a variety of short rectangular-, square-, and disk-shaped mesas of intrinsic Josephson junctions fabricated from a Bi(2)Sr(2)CaCu(2)O(8+δ) single crystal was studied from the observed I-V characteristics, far-infrared spectra, and spatial radiation patterns. In all cases, the radiation frequency satisfies the conditions both for the ac Josephson effect and for a mesa cavity resonance mode. The integer higher harmonics observed in all spectra imply that the ac Josephson effect plays the dominant role in the novel dual-source radiation mechanism.
从由 Bi(2)Sr(2)CaCu(2)O(8+δ) 单晶体制成的各种短矩形、正方形和盘形本征约瑟夫森结的 mesa 中发射的亚太赫兹辐射，从观察到的 I-V 特性、远红外光谱和空间辐射模式进行了研究。在所有情况下，辐射频率都满足 ac 约瑟夫森效应和 mesa 腔共振模式的条件。所有光谱中观察到的整数更高次谐波表明，ac 约瑟夫森效应在新颖的双源辐射机制中起着主导作用。
