Low‐Loss Hybrid High‐Index Dielectric Particles on a Mirror for Extreme Light Confinement,Advanced Optical Materials

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Low‐Loss Hybrid High‐Index Dielectric Particles on a Mirror for Extreme Light Confinement
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-01-15 , DOI: 10.1002/adom.201901820
Aili Maimaiti ₁ , Partha Pratim Patra ₁ , Steven Jones ₁ , Tomasz J. Antosiewicz _{1,

2} , Ruggero Verre ₁

Affiliation

The quest for enhancing light–matter interactions at the nanoscale has led scientists to nanophotonic systems that support the smallest possible modes, which are currently realized via particle‐on‐mirror (PoM) geometries using plasmonic particles. The drawback of metallic PoM systems is the large absorption/scattering ratio due to the significant Ohmic losses inherent to plasmonics. Here, an alternative dielectric PoM composed of a high‐index dielectric nanodisk on top of a metallic mirror is realized. Custom‐shaped high‐quality dielectric colloidal nanoparticles are fabricated and dispersed on a mirror to fully unlock the potential of PoM systems. This hybrid device combines the large field enhancement and extreme localization of plasmonic systems with the low absorption of dielectric nanoresonators. By means of far‐field scattering and near‐field cathodoluminescence spectroscopy, the nature of the modes supported by the hybrid PoM are revealed. Utilizing enhanced spectroscopies, such as Raman and fluorescence, these hybrid‐PoM systems are used in proof‐of‐principle applications. A comparison with Au antennas indicates that the hybrid PoM system presents efficiencies and optical characteristics comparable or superior to those of more conventional purely plasmonic systems, opening new avenues for low‐loss light control at the deep nanoscale level.

中文翻译：

反射镜上的低损耗混合高折射率介电粒子，可实现极限光限制

为了增强纳米级的光-质相互作用，科学家将纳米光子系统引入了支持最小可能模式的系统，该系统目前已通过使用等离激元粒子的镜上粒子（PoM）几何实现。金属PoM系统的缺点是由于等离子激元固有的大量欧姆损耗，因此吸收/散射比很大。在这里，实现了在金属镜顶部由高折射率介电纳米盘组成的替代介电PoM。定制形状的高质量电介质胶体纳米颗粒被制造并分散在镜子上，以充分释放PoM系统的潜力。这种混合设备结合了等离子体系统的大场增强和极端局限性以及介电纳米谐振器的低吸收性。通过远场散射和近场阴极荧光光谱，揭示了混合PoM支持的模式的性质。这些混合PoM系统利用拉曼光谱和荧光光谱等增强的光谱学原理，用于原理验证应用。与金天线的比较表明，混合PoM系统的效率和光学特性可与传统的纯等离激元系统相比，甚至更高，这为在深纳米级的低损耗光控制开辟了新途径。

更新日期：2020-03-20

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