Propagating Surface Plasmon Polaritons Excited at the Graphene Oxide/AgAu Alloy Interface Enhance Nonlinearity,Physica Status Solidi (B) - Basic Solid State Physics

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Propagating Surface Plasmon Polaritons Excited at the Graphene Oxide/AgAu Alloy Interface Enhance Nonlinearity
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-05-22 , DOI: 10.1002/pssb.202000602
Giuseppina Simone ₁

Affiliation

Graphene oxide (GO) contains intrinsic tunable plasmons, leading to highly attractive plasmonic phenomena, besides the GO coupling with metal nanostructures is promising for plasmonics. Herein, a system consisting of an AgAu alloy entangled in a protein network, AgAu@cages, coupled with a GO layer is designed and analyzed. To overcome the challenges posed by the synthesis of the hybrid GO/metal system, the AgAu alloy is grown inside a proteinaceous network. The approach allows control over the alloy size distribution and a close contact with the samples, with positive impact on the plasmonic analysis. The hybrid system reveals a strong dependence on the incident angle and a shorter linewidth as well as a redshift, motivating further investigations to elucidate the phenomenon. Combined experimental and numerical investigations lead to the displaying of the strong coupling that occurs between the plasmons and the molecular cavity of GO, and a coherent amplification of molecular motion. In conclusion, the versatility of GO-based systems allows the manufacture of plasmonic and optical devices sensitive to a wide range of frequencies, from terahertz to the visible frequencies, with extremely low driving voltage.

中文翻译：

在氧化石墨烯/银金合金界面激发的传播表面等离子体激元增强非线性

除了 GO 与金属纳米结构的耦合外，氧化石墨烯 (GO) 包含固有的可调等离子体，导致极具吸引力的等离子体现象。在此，设计并分析了一个由纠缠在蛋白质网络中的 AgAu 合金 AgAu@cages 与 GO 层组成的系统。为了克服混合 GO/金属系统合成带来的挑战，AgAu 合金在蛋白质网络内生长。该方法允许控制合金尺寸分布和与样品的密切接触，对等离子体分析产生积极影响。混合系统显示出对入射角和较短线宽以及红移的强烈依赖性，激发了进一步研究以阐明这一现象。结合实验和数值研究显示了等离子体与 GO 分子腔之间发生的强耦合，以及分子运动的相干放大。总之，基于 GO 的系统的多功能性允许制造对从太赫兹到可见光频率的各种频率敏感且驱动电压极低的等离子体和光学器件。

更新日期：2021-05-22

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