光脉冲通过纳米天线近场激发二维等离子体激元

IF 2.4 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2025-09-19 DOI:10.1016/j.ssc.2025.116162

V.A. Kosobukin

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引用次数: 0

摘要

提出了光脉冲激发二维电子气体中非辐射等离子体激元的理论。假设二维等离子体的纵向振荡是通过一个被光偶极极化的线性纳米天线的近场引起的。导出了二维等离激元偏振波的运动方程，并用强迫稳定振荡和伴随瞬态振荡解析求解。这两种类型的振荡提供了零初始条件和切换光脉冲的瞬态模式。用不同波长的近场激发的二维等离子体包具有不均匀的基本谱谱，在等离子体频率处具有最大值。在切换瞬态模式下，发现二维等离子体激元的极化表现出与激光和可激等离子体激元频率失谐相关的跳动。预测了二维等离子体的光谱及其随时间和波数变化的近场激发效率。

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Excitation of two-dimensional plasmons by light pulses via the near field of a nanoantenna

A theory is presented for excitation of nonradiative plasmons in two-dimensional (2D) electron gas by light pulses. It is assumed that longitudinal 2D plasma oscillations are induced via the near field of a close located linear nanoantenna which is dipole-polarized by light. Equation of motion for polarization waves of 2D plasmons is derived and solved analytically in terms of forced steady and concomitant transient oscillations. The two type of oscillations provide the zero initial conditions and the transient modes in switching a ligth pulse on and off. The packet of 2D plasmons excited via near field with different wavevectors is shown to possess inhomogeneously broadened spectrum of elementary lines with maxima at the frequencies of plasmons. In switching transient mode, the polarization of 2D plasmons is found to exhibit beatings associated with detuning the frequencies of exciting light and excitable plasmon. Predicted are the spectra of 2D plasmons and effectiveness of their near-field excitation depending on time and wavenumber.

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.