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Emission Efficiency of Terahertz Antennas with Conventional Topology and Metal Metasurface: A Comparative Analysis
Optics and Spectroscopy ( IF 0.8 ) Pub Date : 2020-09-02 , DOI: 10.1134/s0030400x20070103
D. V. Lavrukhin , A. E. Yachmenev , I. A. Glinskiy , N. V. Zenchenko , R. A. Khabibullin , Yu. G. Goncharov , I. E. Spektor , K. I. Zaytsev , D. S. Ponomarev

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:

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,
更新日期:2020-09-02
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