We study the field-directed self-assembly and photothermal behavior of one-dimensional (1D) chains of core–shell Fe₃O₄@Au magnetic–plasmonic nanoparticles. Monte Carlo analysis is used to predict the self-assembly of the nanoparticles when they are subjected to a uniform magnetic field and confined to a fluidic nanochannel. A coupled photonic and thermodynamic analysis is performed to analyze the optical and photothermal properties of the 1D chain structures. We show for the first time that the assembled chain structures exhibit a pronounced dip in their absorption spectrum at a wavelength that is strongly sensitive to changes in the refractive index of the surrounding medium. The plasmon enhanced features of these structures are well suited for a variety of theranostic modalities as we discuss.

中文翻译：

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自组装磁等离子体链结构的光热行为的理论研究

我们研究了核-壳Fe ₃ O ₄的一维（1D）链的场定向自组装和光热行为。@Au磁等离子体纳米粒子。当纳米颗粒受到均匀的磁场并被限制在流体纳米通道中时，使用蒙特卡洛分析来预测纳米颗粒的自组装。进行光子和热力学的耦合分析，以分析一维链结构的光学和光热特性。我们首次表明，组装的链结构在对周围介质的折射率变化非常敏感的波长处的吸收光谱中表现出明显的下降。正如我们所讨论的，这些结构的等离激元增强特征非常适合于多种治疗方法。