AI 中文总结
研究金包覆银纳米岛中的等离子体共振和类似法诺干涉，结合多种分析方法表明光学响应受杂化控制，增加金涂层厚度有特定影响，本征模分析确定反共振凹陷特征，确立其为可调谐光学响应的有前景平台。
AI 中文摘要
我们研究了通过固态去湿随后金生长制备的金包覆银纳米岛中的等离子体共振和类似法诺的干涉。通过结合静电光谱分析、全波模拟和线性透射光谱，我们表明光学响应由银岛和金涂层支持的等离子体模式之间的杂化控制。增加金涂层厚度会使低能共振红移，并将光谱权重从高能共振转移到低能共振，而明显的反共振凹陷几乎保持不变。本征模分析将此凹陷确定为超辐射和亚辐射杂化模式之间相消干涉的特征。这些结果确立了包覆双金属纳米岛作为有前景的平台，可通过标准远场光谱获得可调谐的类似法诺光学响应，且制造路线无需光刻图案化，与大面积、低成本生产兼容。
英文摘要
We report robust Fano-like spectral profiles in substrate-supported Au-coated Ag nanoislands fabricated by solid-state dewetting followed by Au overgrowth. Combining electrostatic modal analysis, full-wave simulations, and linear transmission spectroscopy, we investigate the origin of these profiles, their tunability, and their robustness against morphological disorder. Increasing the Au coating thickness progressively red-shifts the low-energy resonance and transfers spectral weight to it from the high-energy resonance, whereas the Fano-like antiresonant dip undergoes a limited spectral displacement. The electrostatic modal analysis identifies this dip as the signature of destructive interference between superradiant and subradiant hybridized modes, and its weak spectral evolution is consistently reproduced by theory, simulations, and experiments. These results establish Au-coated Ag nanoislands as a scalable, lithography-free platform for engineering robust yet tunable Fano-like optical responses accessible through standard far-field spectroscopy.
