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Ultimate terahertz field enhancement of single nanoslits

机译:单纳米缝隙的终极太赫兹场增强

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摘要

A single metallic slit is the simplest plasmonic structure for basic physical understanding of electromagnetic field confinement. By reducing the gap size, the field enhancement is expected to first go up and then go down when the gap width becomes subnanometer because of the quantum tunneling effects. A fundamental question is whether we reach the classical limit of field enhancement before entering the quantum regime, i.e., whether the quantum effects undercut the highest field enhancement classically possible. Here, by performing terahertz time domain spectroscopy on single slits of widths varying from 1.5 nm to 50 μm, we show that ultimate field enhancement determined by the wavelength of light and film thickness can be reached before we hit the quantum regime. Our paper paves way toward designing a quantum plasmonic system with maximum control yet without sacrificing the classical field enhancements.
机译:对于电磁场限制的基本物理理解,单个金属缝是最简单的等离子体结构。通过减小间隙尺寸,由于量子隧穿效应,当间隙宽度变为亚纳米级时,期望场增强首先上升然后下降。一个基本的问题是,在进入量子体系之前我们是否达到了场增强的经典极限,即量子效应是否削弱了经典上可能的最高场增强。在这里,通过对宽度在1.5 nm至50μm之间的单个缝隙进行太赫兹时域光谱分析,我们表明在达到量子状态之前,可以达到由光的波长和膜厚决定的最终场增强。我们的论文为在不牺牲经典场增强的情况下设计具有最大控制力的量子等离子体系统铺平了道路。

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  • 来源
    《Physical review》 |2017年第7期|075424.1-075424.5|共5页
  • 作者单位

    Department of Physics and Astronomy and Center for Atom Scale Electromagnetism, Seoul National University, Seoul 08826, Korea,Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany;

    Department of Physics and Astronomy and Center for Atom Scale Electromagnetism, Seoul National University, Seoul 08826, Korea,Semiconductor Research and Development Center, Samsung Electronics, Gyeonggi-Do 18448, Korea;

    Department of Physics and Astronomy and Center for Atom Scale Electromagnetism, Seoul National University, Seoul 08826, Korea;

    Department of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, Korea;

    Department of Nanoscale Semiconductor Engineering, Hanyang University, Seoul 04763, Korea,Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea;

    Photonic Systems Laboratory, Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea;

    Department of Physics and Astronomy and Center for Atom Scale Electromagnetism, Seoul National University, Seoul 08826, Korea;

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