Plasmonic coupling effect on dephasing time of asymmetric gold nanodimers in capacitive, conductive and overlapping regimes

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-09-30 DOI:10.1016/j.optcom.2025.132520

Merneh Mandado Mana , Boyu Ji , Bereket Dalga Dana , Alemayehu Nana Koya , Jingquan Lin

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引用次数: 0

Abstract

Revealing the spectral and temporal dynamics of hybrid plasmonic modes in strongly interacting plasmonic nanodimers, including capacitively coupled dimer (CaCD), conductively coupled dimer (CoCD), and overlapping dimer (OLD) nanostructure is important for such applications as sensing, enhanced spectroscopy and plasmonic lasers. We theoretically present near field spectral signatures in three asymmetric nanodisk-nanorod (ND-NR) dimers configurations via Finite difference time domain (FDTD) simulation, and investigate the corresponding dephasing time of coupled plasmon modes supported by these nanoparticle dimers using Quasi-Normal mode (QNM). In our results from near-field spectrum fitting across three regimes, we found dephasing times of Fano resonance mode in CaCD is 4.94fs, CTP mode in CoCD is 5.26 fs and BDP mode in OLD is 3.50 fs respectively. This implies that CTP mode in conductively connected nanoparticle exhibit longer dephasing time compared to those in capacitive coupling and overlapping dimers. Moreover, the dephasing time can be further manipulated by varying nanoparticle and connecting junction parameters. Thus, our investigation opens up alternative opportunities for the application of plasmon based sensing, enhanced spectroscopy, non-linear optics and plasmon lasers.

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电浆耦合对非对称金纳米二聚体电容态、导电态和重叠态脱相时间的影响

揭示强相互作用等离子体纳米二聚体（包括电容耦合二聚体（CaCD）、导电耦合二聚体（CoCD）和重叠二聚体（OLD）纳米结构）中杂化等离子体模式的光谱和时间动力学对于传感、增强光谱和等离子体激光等应用具有重要意义。通过时域有限差分（FDTD）模拟，从理论上给出了三种不对称纳米圆盘-纳米棒（ND-NR）二聚体结构的近场光谱特征，并利用准正态模式（QNM）研究了这些纳米颗粒二聚体所支持的耦合等离子体模式的相应消相时间。在近场谱拟合中，我们发现ccd中的Fano共振模式的消相时间为4.94fs， CoCD中的CTP模式为5.26 fs， OLD中的BDP模式为3.50 fs。这表明，与电容耦合和重叠二聚体相比，导电连接纳米颗粒中的CTP模式表现出更长的消相时间。此外，还可以通过改变纳米粒子和连接节点参数来进一步控制脱相时间。因此，我们的研究为基于等离子体的传感、增强光谱学、非线性光学和等离子体激光器的应用开辟了新的机会。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.