BSCCO サブテラヘルツ発振素子の電流電圧特性と放射特性:―液体ヘリウムによる直接冷却からみる自己発熱効果―

概要

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Terahertz emission from BSCCO single-crystal mesa structures has recently attracted considerable attention. Since power fed into the mesa is of the order of 106 W/cm3, a significant self-heating effect appears in I-V characteristics. We measured I-V characteristics of a BSCCO sub-THz oscillator using three cooling methods. When the mesa is cooled directly by liquid helium, the maximum applied voltage is increased up to three times compared with that cooled using a helium flow cryostat. Moreover, radiation characteristics of the BSCCO sub-THz oscillator in liquid helium were investigated using a BSCCO mesa detector. The radiation, identified as TM (2, 0) mode (i.e., the second harmonics of cavity resonance mode along width), is successfully observed.
公益社団法人低温工学・超電導学会 (旧社団法人低温工学協会)の論文