Kuznetsov Alexey, Roy Prithu, Grudinin Dmitry V, Kondratev Valeriy M, Kadinskaya Svetlana A, Vorobyev Alexandr A, Kotlyar Konstantin P, Ubyivovk Evgeniy V, Fedorov Vladimir V, Cirlin George E, Mukhin Ivan S, Arsenin Aleksey V, Volkov Valentyn S, Bolshakov Alexey D
St Petersburg State University, St Petersburg 199034, Russia.
Center for nanotechnologies, Alferov University, Saint Petersburg 194021, Russia.
Nanoscale. 2023 Feb 2;15(5):2332-2339. doi: 10.1039/d2nr04571k.
Semiconductor nanowires are the perfect platform for nanophotonic applications owing to their resonant, waveguiding optical properties and technological capabilities providing control over their crystalline and chemical compositions. The vapor-liquid-solid growth mechanism allows the formation of hybrid metal-dielectric nanostructures promoting sub-wavelength light manipulation. In this work, we explore both experimentally and numerically the plasmonic effects promoted by a gallium (Ga) nanoparticle optical antenna decorating the facet of gallium phosphide (GaP) nanowires. Raman, photoluminescence and near-field mapping techniques are used to study the effects. We demonstrate several phenomena including field enhancement, antenna effect and increase in internal reflection. We show that the observed effects have to be considered when nanowires with a plasmonic particle are used in nanophotonic circuits and discuss the ways for utilization of these effects for efficient coupling of light into nanowire waveguide and field tailoring. The results open up promising pathways for the development of both passive and active nanophotonic elements, light harvesting and sensorics.
半导体纳米线因其具有共振、波导光学特性以及能够控制其晶体和化学成分的技术能力，成为纳米光子应用的理想平台。气-液-固生长机制允许形成促进亚波长光操控的混合金属-电介质纳米结构。在这项工作中，我们通过实验和数值模拟研究了装饰在磷化镓（GaP）纳米线刻面上的镓（Ga）纳米颗粒光学天线所促进的等离子体效应。使用拉曼光谱、光致发光和近场映射技术来研究这些效应。我们展示了包括场增强、天线效应和内反射增加在内的几种现象。我们表明，当在纳米光子电路中使用带有等离子体粒子的纳米线时，必须考虑所观察到的效应，并讨论利用这些效应实现光与纳米线波导的高效耦合以及场定制的方法。这些结果为无源和有源纳米光子元件的开发、光捕获和传感开辟了有前景的途径。
