Terahertz surface plasmon generation on a magnetized metal column by a rotating electron-beam

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical and Quantum Electronics Pub Date : 2024-11-16 DOI:10.1007/s11082-024-07784-8

Avijit Chamoli, Devki Nandan Gupta, Vijay Kumar

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引用次数: 0

Abstract

The excitation of surface plasma wave (SPW) by the interaction of laser and electron beam can generate efficient terahertz (THz) radiation, which may have many applications in THz optics and imaging. In this paper, we investigate THz surface plasmons using the interaction of a rotating electron beam with a magnetized metallic surface. These fields are excited via a transverse component of the current generated in the plasma. The idea behind this research is to enhance the transverse component of the current density by coupling the plasma electrons and the free electrons on the metal surface. The finite azimuthal rotation of the electron beam on the metal surface contributes to the excitation of the SPW via stronger ponderomotive force. The magnetic field applied along the metal surface contributes via cyclotron resonance. We estimate the THz field using a reasonable theoretical model. Several scaling laws are obtained for THz field estimation and optimization. From numerical results, we conclude that a considerable THz field strength can be enhanced by employing a rotating electron beam. The peak THz field strength is estimated about 70 GV/cm of 2.5 THz frequency for 0.4 T magnetic field. This research gives a unique and feasible method to generate THz radiation with a rotating electron beam on a magnetized metal column.

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旋转电子束在磁化金属柱上产生太赫兹表面等离子体

通过激光和电子束的相互作用激发表面等离子体波（SPW）可以产生高效的太赫兹（THz）辐射，在太赫兹光学和成像领域有很多应用。在本文中，我们利用旋转电子束与磁化金属表面的相互作用来研究太赫兹表面等离子体。这些场是通过等离子体中产生的电流的横向分量激发的。这项研究背后的理念是通过等离子体电子和金属表面自由电子的耦合来增强电流密度的横向分量。电子束在金属表面上的有限方位旋转会通过更强的思索动力激发 SPW。沿金属表面施加的磁场通过回旋共振起作用。我们使用一个合理的理论模型来估算太赫兹场。为太赫兹场估算和优化获得了若干缩放定律。根据数值结果，我们得出结论：采用旋转电子束可以增强相当大的太赫兹场强。在 0.4 T 磁场中，频率为 2.5 THz 的峰值 THz 场强估计为 70 GV/cm。这项研究为在磁化金属柱上利用旋转电子束产生太赫兹辐射提供了一种独特而可行的方法。

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

Optical and Quantum Electronics 工程技术-工程：电子与电气

CiteScore

4.60

自引率

20.00%

发文量

810

审稿时长

3.8 months

期刊介绍： Optical and Quantum Electronics provides an international forum for the publication of original research papers, tutorial reviews and letters in such fields as optical physics, optical engineering and optoelectronics. Special issues are published on topics of current interest. Optical and Quantum Electronics is published monthly. It is concerned with the technology and physics of optical systems, components and devices, i.e., with topics such as: optical fibres; semiconductor lasers and LEDs; light detection and imaging devices; nanophotonics; photonic integration and optoelectronic integrated circuits; silicon photonics; displays; optical communications from devices to systems; materials for photonics (e.g. semiconductors, glasses, graphene); the physics and simulation of optical devices and systems; nanotechnologies in photonics (including engineered nano-structures such as photonic crystals, sub-wavelength photonic structures, metamaterials, and plasmonics); advanced quantum and optoelectronic applications (e.g. quantum computing, memory and communications, quantum sensing and quantum dots); photonic sensors and bio-sensors; Terahertz phenomena; non-linear optics and ultrafast phenomena; green photonics.