在光热电泳场中调控Fano耦合
Manipulating Fano coupling in an opto-thermoelectric field
AI总结：
本文提出一种全光拾取-放置方法，利用光热电泳场组装硅与BaTiO3纳米颗粒构成的全介质异质结构，实现了Fano共振的可重构调控，为按需控制Fano耦合提供了通用设计规则和全光平台。
摘要：
光子学中的Fano共振源于破缺对称结构中两个共振模式之间的耦合与干涉。它们具有非对称、窄且可调谐的线型，非常适合用于光谱学。过去十年中，纳米光子学领域提出了许多Fano共振结构，但可重构性和定制化设计仍然具有挑战性。在此，我们提出一种全光拾取-放置方法，旨在以可重构的方式组装各种几何形状和组成的Fano超分子。我们通过原位暗场散射光谱研究它们的耦合行为。在光引导的光热电泳场驱动下，具有高品质因子Mie共振（离散态）的硅纳米颗粒和低损耗BaTiO3纳米颗粒（连续态）被组装成全介质异质二聚体，其中观察到明显的Fano共振。通过改变离散态的共振频率或光的偏振，可以调节Fano参数。我们还展示了通过改变介质异质低聚体中连续态和离散态的数量来实现可调谐的耦合强度和多重Fano共振。我们的工作为Fano共振提供了通用的设计规则，并为按需控制Fano耦合提供了一个全光平台。
英文摘要：
Fano resonances in photonics arise from the coupling and interference between two resonant modes in structures with broken symmetry. They feature an uneven and narrow and tunable lineshape, and are ideally suited for optical spectroscopy. Many Fano resonance structures have been suggested in nanophotonics over the last ten years, but reconfigurability and tailored design remain challenging. Herein, we propose an all-optical pick-and-place approach aimed at assemble Fano metamolecules of various geometries and compositions in a reconfigurable manner. We study their coupling behavior by in-situ dark-field scattering spectroscopy. Driven by a light-directed opto-thermoelectric field, silicon nanoparticles with high quality-factor Mie resonances (discrete states) and low-loss BaTiO3 nanoparticles (continuum states) are assembled into all-dielectric heterodimers, where distinct Fano resonances are observed. The Fano parameter can be adjusted by changing the resonant frequency of the discrete states or the light polarization. We also show tunable coupling strength and multiple Fano resonances by altering the number of continuum states and discrete states in dielectric heterooligomers. Our work offers a general design rule for Fano resonance and an all-optical platform for controlling Fano coupling on demand.
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