Broadband Asymmetric Transmission of Linearly Polarized Mid-Infrared Light Based on Quasi-3D Metamaterials,Advanced Functional Materials

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Broadband Asymmetric Transmission of Linearly Polarized Mid-Infrared Light Based on Quasi-3D Metamaterials
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-01-07 , DOI: 10.1002/adfm.202109659
Eric B. Whiting ₁ , Michael D. Goldflam ₂ , Lei Kang ₁ , Michael B. Sinclair ₂ , Katherine M. Musick ₂ , Sawyer D. Campbell ₁ , D. Bruce Burckel ₂ , Douglas H. Werner ₁

Affiliation

Metamaterials consisting of subwavelength resonators offer an exciting opportunity for realizing asymmetric transmission (AT) of linearly polarized light. However, to date, only moderate/narrow-band AT responses have been obtained in metadevices based on stacked planar nanostructures. Here, leveraging a combination of a genetic algorithm (GA) based optimization method and a membrane projection lithography (MPL) fabrication approach, a quasi-3D metamaterial for broadband AT of linearly polarized mid-infrared light is demonstrated. Facilitated by the customized GA, an efficient exploration of 3D plasmonic meta-atoms with broken mirror symmetry in the light propagation direction allows the satisfaction of the rigorous conditions for AT of linearly polarized waves over a broad wavelength range. Confirmed by surface current analysis, the observed AT behavior is attributed to the resonant coupling between the plasmonic nanostructures located on the two orthogonal walls of the MPL cavities. Incorporating an advanced inverse-design method and a state-of-art fabrication technique, the methodology used in the present study provides a promising route for exploiting 3D metamaterials with sophisticated functionalities via effectively exploring the high-dimensional parametric space offered by true 3D meta-atoms.

中文翻译：

基于准3D超材料的线偏振中红外光宽带非对称传输

由亚波长谐振器组成的超材料为实现线偏振光的非对称传输 (AT) 提供了令人兴奋的机会。然而，迄今为止，在基于堆叠平面纳米结构的超器件中仅获得了中等/窄带 AT 响应。在这里，利用基于遗传算法 (GA) 的优化方法和膜投影光刻 (MPL) 制造方法的组合，展示了用于线性偏振中红外光宽带 AT 的准 3D 超材料。在定制 GA 的推动下，有效探索在光传播方向上具有破碎镜像对称性的 3D 等离子体元原子可以满足宽波长范围内线偏振波 AT 的严格条件。通过表面电流分析确认，观察到的 AT 行为归因于位于 MPL 腔的两个正交壁上的等离子体纳米结构之间的共振耦合。本研究中使用的方法结合了先进的逆向设计方法和最先进的制造技术，通过有效探索真正的 3D 超材料提供的高维参数空间，为开发具有复杂功能的 3D 超材料提供了一条有希望的途径。原子。

更新日期：2022-01-07

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