Quasicylindrical Waves for Ordered Nanostructuring,Nano Letters

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Quasicylindrical Waves for Ordered Nanostructuring
Nano Letters ( IF 9.6 ) Pub Date : 2022-11-17 , DOI: 10.1021/acs.nanolett.2c03851
Jiao Geng _{1,

2} , Wei Yan _{1,

2} , Liping Shi _{1,

2,

3} , Min Qiu _{1,

2}

Affiliation

Laser-induced self-organization of periodic nanostructures on highly absorbing materials is widely understood to be due to interference between laser and surface plasmon polaritons (SPPs) that are excited by initial surface roughness. The structure order naturally emerges from the propagation phase of SPPs. Here, we reveal an unexplored mechanism that is predominantly induced by quasicylindrical waves (QCWs) with negligible contributions from SPPs. This mechanism features a new principle of order emergence in growth of periodic nanostructures through short-range electromagnetic interactions between QCWs and marginal nanofringes. In this scenario, the periodicity of nanostructures is not simply determined by the electromagnetic wavelength. With suppressed long-range interactions, the formation of nanostructures shows a domino-like growth process, thus significantly improving structure uniformity. An in situ microscopic observation is performed to characterize the temporal dynamics of structural growth and verify the new mechanism. Further, the QCWs are directly observed in experiments, which are theoretically supported by a scattering model.

中文翻译：

用于有序纳米结构的准圆柱波

高吸收材料上激光诱导的周期性纳米结构自组织被广泛认为是由于激光和表面等离子激元 (SPP) 之间的干涉，后者由初始表面粗糙度激发。结构顺序自然地从 SPP 的传播阶段出现。在这里，我们揭示了一种未探索的机制，该机制主要由准圆柱波 (QCW) 引起，SPP 的贡献可忽略不计。这种机制的特点是通过 QCW 和边缘纳米边缘之间的短程电磁相互作用，在周期性纳米结构的生长中有序出现的新原理。在这种情况下，纳米结构的周期性不仅仅由电磁波长决定。通过抑制远程相互作用，纳米结构的形成显示出类似多米诺骨牌的生长过程，从而显着提高结构均匀性。一个进行原位显微观察以表征结构生长的时间动力学并验证新机制。此外，QCW 是在实验中直接观察到的，这在理论上得到了散射模型的支持。

更新日期：2022-11-17

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