Cuprate superconductor Bi₂Sr₂CaCu₂O_8+δ (BSCCO) has been a promising candidate of a coherent, continuous, and compact THz light source owing to its intrinsic Josephson junction (IJJ) inside the crystal structure. In this paper, we utilized BSCCO cross-whisker (CW) junctions to produce THz emitter device using the whisker crystals which can be easily obtained compared with single crystals. As a result, we have successfully observed the emission from the CW IJJ at the frequency of ∼0.7THz, which is the first observation of a THz emission from whiskers to our knowledge. Our findings would enlarge the applicability of BSCCO superconductors for compact THz emission sources.

铜酸盐超导体Bi ₂ Sr ₂ CaCu ₂ O _{8+ δ} （BSCCO）由于其固有的约瑟夫森结（IJJ）位于晶体结构内，因此是相干，连续且紧凑的THz光源的有希望的候选者。在本文中，我们利用BSCCO交叉晶须（CW）结生产了使用晶须晶体的THz发射极器件，与单晶相比，晶须晶体容易获得。结果，我们成功地观察到了CW IJJ在〜0.7THz处的发射，这是从晶须到我们所知的THz发射的第一个观察结果。我们的发现将扩大BSCCO超导体在紧凑型THz发射源中的适用性。