Large area Terahertz digitated photoconductive antennas based on a single high resistivity metal and nanoplasmonic electrode

IF 2.5 3区 物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Photonics and Nanostructures-Fundamentals and Applications Pub Date : 2024-03-02 DOI:10.1016/j.photonics.2024.101248
Anna De Vetter, Chao Song, Martin Mičica, Jerome Tignon, Juliette Mangeney, José Palomo, Sukhdeep Dhillon
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Abstract

Optical excited photoconductive antennas are a central technology for the Terahertz (THz) domain, crucial for both emitting and detecting THz radiation. This work proposes and experimentally realises a new approach in digitated photoconductive antennas (d-PCAs) based on a single digitated high resistivity metal contact with integrated resistances as voltage dividers. This permits a uniform applied electric field over a large surface area and a single step device processing procedure, simplifying the device realisation. This concept is further combined with digitated plasmonic nano-antennas that permits to enhance the light-matter interaction. Through femtosecond optical excitation of such structures, THz pulses can be generated efficiently through this device. Further, for the plasmonic d-PCA, the detected THz electric field of the device shows the effect of polarisation of the incident IR beam, highlighting the role of the nanostructured digitated contacts. This work is supported by electromagnetic simulations showing the optical and THz response of this new type of photoconductive antenna with integrated resistances.

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基于单一高电阻率金属和纳米光电导电极的大面积太赫兹数字化光电导天线
光激发光电导天线是太赫兹(THz)领域的核心技术,对于发射和探测太赫兹辐射至关重要。这项研究提出并在实验中实现了数字化光电导天线(d-PCAs)的新方法,该方法基于单个数字化高电阻率金属触点和作为分压器的集成电阻。这样就能在大面积表面上形成均匀的外加电场,并采用单步器件处理程序,从而简化了器件的实现过程。这一概念还与数字等离子纳米天线相结合,从而增强了光与物质的相互作用。通过对这种结构进行飞秒光激发,可以通过该设备有效地产生太赫兹脉冲。此外,对于质子 d-PCA,该器件检测到的太赫兹电场显示了入射红外光束的极化效应,突出了纳米结构数字化触点的作用。这项工作得到了电磁模拟的支持,模拟显示了这种集成电阻的新型光电导天线的光学和太赫兹响应。
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来源期刊
CiteScore
5.00
自引率
3.70%
发文量
77
审稿时长
62 days
期刊介绍: This journal establishes a dedicated channel for physicists, material scientists, chemists, engineers and computer scientists who are interested in photonics and nanostructures, and especially in research related to photonic crystals, photonic band gaps and metamaterials. The Journal sheds light on the latest developments in this growing field of science that will see the emergence of faster telecommunications and ultimately computers that use light instead of electrons to connect components.
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