Photonic Terahertz-Wave Generation Using Slot-Antenna-Integrated Uni-Traveling-Carrier Photodiodes
Photonic Terahertz-Wave Generation Using Slot-Antenna-Integrated Uni-Traveling-Carrier Photodiodes
复制标题
使用集成缝隙天线单行进载波光电二极管产生光子太赫兹波
DOI：
10.1109/jstqe.2017.2657678
复制
发表时间：
2017
影响因子：
4.9
通讯作者：
H. Ito and T. Ishibashi
中科院分区：
文献类型：
--
作者：
Y.Tsutsumi;M. Ohashi;Y. Miyoshi;and H. Kubota;H. Ito and T. Ishibashi
研究了利用缝隙天线集成的单向载流子光电二极管（UTC-PD）产生宽频率可调谐的太赫兹波并提高输出功率。基于数值分析，确定了同时获得较高输出功率和较宽带宽的最佳天线结构。分别制作了长槽和短槽的UTC-PD和宽带蝴蝶结天线的UTC-PD，并对它们的特性进行了比较分析。缝隙天线集成的UTC-PD在其谐振峰值频率处表现出比蝴蝶结天线集成的UTC-PD大两到三倍的输出功率。短槽器件在900 ~ 1.6 THz频率范围内输出功率增强，长槽器件在350 ~ 850 GHz频率范围内输出功率增强，这些特性与数值分析结果吻合较好。在1.25 THz和700 GHz下，当光电流为10 mA，偏压为-0.4 V时，短缝器件的典型输出功率分别为3.5 μW和28 μW。
Widely frequency-tunable terahertz-wave generation with enhanced output power was investigated using slot-antenna-integrated uni-traveling-carrier photodiodes (UTC-PDs). Based on numerical analysis, the optimum antenna configuration for simultaneously attaining increased output power and relatively broad bandwidth was determined. Slot-antenna-integrated UTC-PDs (short- and long-slot) and a broadband bowtie-antenna-integrated UTC-PD were fabricated and analyzed by comparing their characteristics. The slot-antenna-integrated UTC-PDs exhibited two to three times larger output power at their resonant peak frequencies than that of the bowtie-antenna-integrated UTC-PD. Output-power enhancement was attained at frequencies from 900 GHz to 1.6 THz for the short-slot device and from 350 to 850 GHz for the long-slot device, and these characteristics were in good agreement with the numerical analysis. The typical output power obtained was 3.5 μW for the short-slot device at 1.25 THz and 28 μW for the long-slot device at 700 GHz both for a photocurrent of 10 mA with a bias voltage of -0.4 V.