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<p>This study investigates the influence of cavity mode resonance on coherent terahertz emission in intrinsic Josephson junction stacks of the high-temperature superconductor Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+x</sub> (BSCCO). Two BSCCO samples with deliberately varied geometries are designed to decouple the role of geometric dimensions from material parameters, enabling a systematic exploration of the correlation between terahertz emission and cavity modes. Experimental results reveal that in the low-bias regime, discrete emission frequencies exclusively align with longitudinal (0, m) cavity modes, whose selection is primarily governed by the stack’s length. Each resonant mode corresponds to a distinct sharp peak in the emitted power. In contrast, the high-bias regime enables continuous frequency tuning though emission is significantly affected by hotspot formation. Notably, the transverse (1, 0) mode, when excited, exhibits significantly weaker radiation power compared to the longitudinal modes, highlighting the critical impact of geometry on radiation efficiency. This work highlights geometric design as a highly effective and tunable strategy for controlling terahertz emission in BSCCO stacks, offering experimental insights for optimizing high-<i>T</i><sub>c</sub> superconductor terahertz sources.</p>

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Tuning Cavity Modes in BSCCO Terahertz Emitters via Geometric Design

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Huili Zhang,
  • Wanghao Tian

摘要

This study investigates the influence of cavity mode resonance on coherent terahertz emission in intrinsic Josephson junction stacks of the high-temperature superconductor Bi2Sr2CaCu2O8+x (BSCCO). Two BSCCO samples with deliberately varied geometries are designed to decouple the role of geometric dimensions from material parameters, enabling a systematic exploration of the correlation between terahertz emission and cavity modes. Experimental results reveal that in the low-bias regime, discrete emission frequencies exclusively align with longitudinal (0, m) cavity modes, whose selection is primarily governed by the stack’s length. Each resonant mode corresponds to a distinct sharp peak in the emitted power. In contrast, the high-bias regime enables continuous frequency tuning though emission is significantly affected by hotspot formation. Notably, the transverse (1, 0) mode, when excited, exhibits significantly weaker radiation power compared to the longitudinal modes, highlighting the critical impact of geometry on radiation efficiency. This work highlights geometric design as a highly effective and tunable strategy for controlling terahertz emission in BSCCO stacks, offering experimental insights for optimizing high-Tc superconductor terahertz sources.