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Simple Theoretical Considerations for Block- Copolymer-Based Plasmonic Metamaterials

机译：嵌段共聚物等离子超材料的简单理论考虑

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摘要

Block-copolymers (BCPs) self-assembling provides a unique tool for realizing large-area ordered metamaterials with desired optical properties due to the rich range of tunable nano-morphologies and to the chemical properties of the block polymers that can lead to the selective inclusion of functionalized nanoparticles (NPs) in specific nanodomains, generating periodic arrays of NPs according to the geometry of the BCP acting as template. In this work, we investigate nanostructured thin films of polystyrene-block-poly(methylmethacrylate) (PS-PMMA) BCP filled with functionalized metallic (Au) nanoparticles. The BCP is characterized by an hexagonal array of PS cylinders in the PMMA matrix and the Au NPs are selectively included in the PS cylindrical domains. The optical properties of such nano-structures are strongly affected by localized surface plasmons (LSPs) in the NPs. We theoretically demonstrate that the optical properties of such nano-structures can be tuned by varying the NPs loading concentration and the NPs radius. Then, we investigate the effects of the hexagonal geometry on the collective plasmonic oscillations. We fabricated the PS-PMMA/Au NPs composite and we experimentally demonstrate the existence of collective plasmonic resonances of gold nanoparticles after an electromagnetic stimulation, arising from the ordered arrangement of AuNPs in the periodic array of hexagonally packed cylinders created by BCP self-assembly. This approach allows a fine modulation of the NPs optical properties and can be used as an intriguing and versatile tool to build useful devices for Optics & Photonics applications, with significant benefits for both fundamental and applied investigations.
机译：嵌段共聚物（BCP）的自组装为实现具有所需光学性质的大面积有序超材料提供了独特的工具，这是由于其可调谐纳米形态的丰富范围以及可以导致选择性包含的嵌段聚合物的化学性质特定纳米域中的功能化纳米颗粒（NP）的排列，根据BCP的几何形状生成周期性的NP阵列作为模板。在这项工作中，我们研究了填充有功能化金属（Au）纳米粒子的聚苯乙烯嵌段聚（甲基丙烯酸甲酯）（PS-PMMA）BCP的纳米结构薄膜。 BCP的特征是在PMMA矩阵中PS圆柱的六边形阵列，Au NPs被选择性地包含在PS圆柱域中。这种纳米结构的光学性质受到NP中局部表面等离激元（LSP）的强烈影响。我们从理论上证明，可以通过改变NPs的负载浓度和NPs半径来调整此类纳米结构的光学特性。然后，我们研究六边形几何形状对集体等离激元振荡的影响。我们制造了PS-PMMA / Au NPs复合材料，并通过实验证明了金纳米颗粒在电磁刺激后的集体等离子体共振的存在，这是由BCP自组装产生的六方堆积圆柱体的周期性阵列中的AuNPs有序排列引起的。这种方法可以对NPs的光学特性进行精细调制，并且可以作为一种有趣的多功能工具来构建用于光学和光子学应用的有用设备，这对于基础研究和应用研究都具有明显的好处。

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