Enhanced THz emission from photoconductive antennas by integrating photonic structures on a semi-insulating GaAs substrate

IF 1.9 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Pramana Pub Date : 2025-02-04 DOI:10.1007/s12043-024-02886-0
Goutam Rana, Abhishek Gupta, Arkabrata Bhattacharya, S P Duttagupta, Shriganesh S Prabhu
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引用次数: 0

Abstract

Tera Hertz photoconductive antennas (THz PCAs) have significantly advanced the THz research by offering room-temperature operation, broad bandwidth and relatively low cost as both emitters and detectors. However, the primary limitation has been their low power output due to inefficient conversion. This article demonstrates a substantial improvement in efficiency (\(\sim 200\%\)) by incorporating sub-micron photonic structures on the surface. These photonic structures enhance pump beam coupling, leading to increased photocarrier generation. They also facilitate efficient carrier recombination after THz emission, thereby suppressing carrier screening. Experimental and numerical studies confirm the enhanced photocarrier generation and controlled transport through defect-free paths, further reducing screening effects. The integration of photonic structures into large area emitters (LAEs) holds the potential to develop emitters and detectors suitable for real-world THz systems, overcoming the limitations of the current commercial LAEs that rely on plasmonic structures or antireflection coatings. This innovation has the potential to revolutionise THz technology, enabling the development of more powerful and efficient THz sources and detectors. This can lead to advancements in various fields, including wireless communication, imaging and sensing and spectroscopy.

在半绝缘GaAs衬底上集成光子结构增强光导天线的太赫兹辐射
太赫兹光导天线(THz PCAs)作为发射体和探测器具有室温工作、宽带宽和相对较低的成本,大大推进了太赫兹研究。然而,主要的限制是由于转换效率低下而导致的低功率输出。这篇文章展示了在表面上结合亚微米光子结构的效率的实质性提高(\(\sim 200\%\))。这些光子结构增强了泵浦光束耦合,导致光载流子的产生增加。它们还促进了太赫兹发射后载流子的有效重组,从而抑制了载流子的筛选。实验和数值研究证实了增强的光载流子生成和通过无缺陷路径的控制传输,进一步降低了筛选效应。将光子结构集成到大面积发射体(LAEs)中,有可能开发出适用于现实世界太赫兹系统的发射体和探测器,克服了当前依赖等离子体结构或增透涂层的商用LAEs的局限性。这一创新有可能彻底改变太赫兹技术,使开发更强大、更高效的太赫兹源和探测器成为可能。这可以导致各个领域的进步,包括无线通信、成像、传感和光谱学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Pramana
Pramana 物理-物理:综合
CiteScore
3.60
自引率
7.10%
发文量
206
审稿时长
3 months
期刊介绍: Pramana - Journal of Physics is a monthly research journal in English published by the Indian Academy of Sciences in collaboration with Indian National Science Academy and Indian Physics Association. The journal publishes refereed papers covering current research in Physics, both original contributions - research papers, brief reports or rapid communications - and invited reviews. Pramana also publishes special issues devoted to advances in specific areas of Physics and proceedings of select high quality conferences.
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