Abstract

Characteristics of photoconductive antennas (PCAs)—radiation sources with conventional topology and a metal metasurface in the shape of a plasmonic grating made on the basis of InGaAs/InAlAs superlattice heterostructures—have been studied experimentally. The photocurrents and THz power spectra of samples of PCAs have been measured, the energy characteristics of terahertz (THz) radiation, and the optical-to-THz conversion efficiency at different bias voltages and average laser excitation power have been determined. For PCAs with a metasurface, the integrated THz radiation power of 10 μW and a conversion efficiency of up to 0.2%, unattainable for antennas with conventional topology due to their thermal breakdown, have been demonstrated experimentally. Therefore, it can be stated that PCAs with a metasurface are efficient sources of THz radiation and can become an element base for constructing THz spectroscopy systems associated with solving medical diagnostic problems.

中文翻译：

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具有常规拓扑和金属超表面的太赫兹天线的发射效率：比较分析

摘要

实验研究了光电导天线（PCA）的特性-具有常规拓扑结构的辐射源和基于InGaAs / InAlAs超晶格异质结构制成的等离子栅形状的金属超表面。测量了PCA样品的光电流和THz功率谱，确定了太赫兹（THz）辐射的能量特性，并确定了在不同偏置电压和平均激光激发功率下的光到THz转换效率。对于具有超表面的PCA，已经通过实验证明了具有10μW的集成THz辐射功率和高达0.2％的转换效率，这是具有传统拓扑的天线由于其热击穿而无法实现的。因此，