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arXiv 2103.04495physics.optics
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光学磁性多极共振在大动态超分子中的应用

Optical Magnetic Multipolar Resonances in Large Dynamic Metamolecules

Omar Ibrahim, Sunghee Lee, Sung Wook Kim, Seung Beom Pyun, Connor Woods, Eun Chul Cho, So-Jung Park, Zahra Fakhraai

AI总结:

本研究通过T矩阵方法表征动态超分子中的磁多极共振,发现增大尺寸和减小间隙可增强高阶多极模式,并建议实验验证前向或后向散射中的高阶光学磁共振。

摘要:

动态超分子(DMMs)由水凝胶制成的介电核心和随机堆积的等离子体纳米珠组成,当受到光频光激发时可显示磁共振。通过温度变化控制核心直径,可以调控其光学性质。我们最近已证明DMMs表现出强烈的光学磁性,包括磁偶极和磁四极共振,为新型应用提供了巨大潜力。在此,我们采用T矩阵方法表征模型超分子的磁多极共振模式,并探索其在实验数据中的存在。我们表明,随着珠子尺寸和整体结构尺寸的增加,以及珠子间间隙的减小,高阶多极共振变得显著。在此极限下,高阶磁多极模式之间的模式混合也变得重要,特别是在定向散射光谱中。我们讨论了实验和模拟中观察到的磁散射趋势,并为在前向或后向散射光谱中设计和验证高阶光学磁共振提供了建议。此外,高阶磁模式的角散射可显示类似Fano的干涉图案,这在实验上应可检测到。

英文摘要:

Dynamic metamolecules (DMMs) are composed of a dielectric core made of hydrogel surrounded by randomly-packed plasmonic beads that can display magnetic resonances when excited by light at optical frequencies. Their optical properties can be controlled by controlling their core diameter through temperature variations. We have recently shown that DMMs display strong optical magnetism, including magnetic dipole and magnetic quadrupole resonances, offering significant potential for novel applications. Here, we use a T-matrix approach to characterize the magnetic multipole resonance modes of model metamolecules and explore their presence in experimental data. We show that high-order multipole resonances become prominent as the bead size and the overall structure sizes are increased, and when the the inter-bead gap is decreased. In this limit, mode mixing among high-order magnetic multipole modes also become significant, particularly in the directional scattering spectra. We discuss trends in magnetic scattering observed in both experiments and simulations, and provide suggestions for experimental design and verification of high-order optical magnetic resonances in the forward or backward scattering spectra. In addition, angular scattering of higher-order magnetic modes can display Fano-like interference patterns that should be experimentally detectable.

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