基于新电极的太赫兹光电导天线设计

Design of Terahertz Photoconductive Antenna Based on New Electrodes

摘要:

本文提出了分别采用凹形电极和新叉指形电极的两种光电导天线,其电极产生的静电场电场强度是中间小而周围大,而激光光斑的光强是中间大而周围小,因此提高了衬底的抗击穿能力和光电流。相比于采用传统带状线电极的光电导天线,采用凹形电极的光电导天线产生的光电流提升了62%；相比于采用传统叉指形电极的光电导天线,采用新叉指形电极的光电导天线产生的光电流提升了41%。所设计的两种光电导天线都具有结构简单、便于加工且易与其它提高辐射功率的技术相结合的优点,其在成像、生物传感、通信领域和光电探测有着重要的潜在应用价值。

Abstract:

In this paper, two kinds of photoconductive antennas with concave electrodes and new interdigital electrodes are proposed. The electrostatic field intensity generated by these electrodes is small at the middle of substrate and large in the periphery, while light intensity of the laser spot is large at the middle of the laser spot and small in the periphery, thus improving the resistance to breakdown and photocurrent of the substrate. compared to the photoconductive antenna with traditional electrodes, the photocurrent generated by the photoconductive antenna with concave electrodes is increased by 62%; compared to the photoconductive antenna with traditional interdigital electrodes, the photocurrent generated by the photoconductive antenna with new interdigital electrodes is increased by 41%. The two kinds of terahertz photoconductive antennas designed, which have important potential application values in imaging, biosensing, communication and photoelectric detection, have the advantages of simple structure, easy processing and easy combination with other technologies to improve radiant power.