Compact High-Tc Superconducting Terahertz Emitter with Tunable Frequency from 0.15 to 1 THz
Hancong Sun, Shixian Chen, Yong-Lei Wang, Guozhu Sun, Jian Chen, Takeshi Hatano, V. P. Koshelets, D. Koelle, R. Kleiner, Huabing Wang, Peiheng Wu
Abstract
A compact cryogenic terahertz emitter is highly desired for applications in terahertz astronomy with a broad frequency range of emissions and relatively high emission power. In this paper, we report on a terahertz emitter based on Bi2Sr2CaCu2O8 + δ (BSCCO) intrinsic Josephson junctions, with a frequency range from 0.15 to 1.01 THz. The emitter is a square gold-BSCCO-gold mesa on a sapphire substrate fabricated by a simple and efficient method. The highest emission power of 5.62 μW at 0.35 THz was observed at 50 K. A record low emission frequency of 0.15 THz was achieved at 85 K, extending the applicability of BSCCO terahertz emitters in the low-frequency range.