We experimentally verified a proposed microstrip antenna model for high-$T_c$ superconducting coherent terahertz emitters. We attached conductive metal patches to single crystalline Bi${}_2$Sr${}_2$CuCu${}_2$O${}_{8+\delta }$ mesas to probe the electromagnetic resonance conditions near the mesa sidewalls, where the coherent terahertz radiation is emitted. A systematic experiment reveals that an internal cavity resonance, which is an essential ingredient for outside radiation, remains unaltered by the presence of the ambient microstrip patterns. We found that an emission frequency is well predicted by the proposed model and that, in contrast to the conventional microstrip antenna, the internal cavity mode is more robust to the external microstrip patterns than expected from the proposed model. The experimental result requires us to modify the model to allow for a spontaneous synchronization of intrinsic Josephson oscillations that stimulates the stable excitation of the internal cavity resonance.

中文翻译：

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高温超导太赫兹发射器微带天线模型的实验验证

我们通过实验验证了所提出的微带天线模型，用于高${吨}_C$超导相干太赫兹发射器。我们将导电金属贴片连接到单晶 Bi${}_2$锶${}_2$铜铜${}_2$哦${}_{8+\delta }$台面以探测台面侧壁附近的电磁共振条件，在那里发射相干太赫兹辐射。系统实验表明，作为外部辐射的重要组成部分的内腔谐振不会因周围微带图案的存在而改变。我们发现所提出的模型可以很好地预测发射频率，并且与传统的微带天线相比，内腔模式对外部微带模式的鲁棒性比所提出的模型预期的要强。实验结果要求我们修改模型以允许内在约瑟夫森振荡的自发同步，从而刺激内腔共振的稳定激发。