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银纳米粒子阵列中衍射诱导高品质因子的四偶极晶格等离子体共振

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银纳米粒子阵列中衍射诱导高品质因子的四偶极晶格等离子体共振

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Diffraction-induced quadrupolar lattice plasmon modes of high-quality factors for silver nanoparticle arrays

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  • 金属纳米颗粒阵列中形成的四偶极晶格共振模式具有低辐射损耗、高品质因子的特性,因此广泛应用于纳米激光、传感、固态照明等领域。基于时域有限差分法在均匀环境下研究了银纳米圆柱阵列的光谱与近场特性。研究结果表明,在x偏振光直入射下,通过调节阵列x方向的周期,共振强度先增加后降低,当两个方向上的周期相等时,提出的阵列结构能够产生一个线宽约0.4 nm、品质因子高达1815的四偶极晶格共振模式,这种共振模式呈现出Fano线型的透射谷;调控y方向的周期能够实现从Fano线型的透射峰到透射谷的转变;此外,银纳米圆柱直径、高度的增加将更有利于四偶极晶格共振模式的产生。本文说明了粒子大小、晶格周期对四偶极晶格共振模式的重要性,同时为银纳米颗粒在可见光波段设计高品质因子共振提供了优化策略。
    Regular plasmonic nanostructures have made great progress in numerous applications, such as nano-lasers, sensing, solid-state lighting, and so on, in which a crucial performance? with lower loss or high quality (Q) factor plasmonic resonances is improved. Hybridization of mixed plasmon-photonic modes can be known as surface lattice resonances (SLRs) in nanoparticle arrays, which originated from the coupling of localized surface plasmon resonances (LSPRs) to in-plane diffraction orders——so-called Rayleigh anomalies (RAs)——in a homogeneous environment, leading to extremely narrow resonances. Single metallic nanoparticle, however, can support both dipolar and quadrupolar resonances by increasing the size of nanoparticle, and dipolar lattice plasmon modes (DLPMs) or quadrupolar lattice plasmon modes (QLPMs) can be achieved through shifting diffraction orders related to particle-particle spacing and refractive index concerning these LSPRs in arrays of metallic nanoparticles. In this letter, we explored sharp QLPMs of the silver nanodisks arrays in the visible region by adjusting lattice periods in x and y directions or the size of nanodisks. In the first place, scattering cross-section and near-field electric field distribution of single silver nanodisk indicate the existence of dipolar and quadrupolar LSPRs, and thus the optical response of silver nanodisk arrays exhibits the peak-and-dip profile of DLPMs and QLPMs at different wavelengths. The difference is that the propagation direction of QLPMs is along the direction of the incident electric field, while that of the DLPMs is just the opposite. Therefore, we can enable these resonance modes to be selectively accessed and individually optimized by tuning lattice periods in the x- or y-direction. By changing the lattice period in the x-direction from 300 nm to 550 nm with a step of 50 nm, transmission dips intensity increase gradually, and when the periods in the two directions are equal, the transmission dip exhibits a narrow-band QLPM resonance with a linewidth of 0.4 nm, corresponding quality factor as high as Q=1815 under the x-polarized light. In particular, by varying periods in the y-direction, the QLPM resonance can also be manipulated ranging from an asymmetric Fano-like lineshape peak to a dip. Moreover, we also have proved that the size of silver nanodisks play also a crucial role in the realization of QLPMs. The acquisition of these results may provide a design strategy for high-quality factor resonances in nanolasers, sensing, and nonlinear optics.
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出版历程
  • 收稿日期:  2021-09-02
  • 上网日期:  2021-11-11

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