Research data supporting: Revealing Nanostructures through Plasmon Polarimetry

Polarized optical dark-field spectroscopy is shown to be a versatile noninvasive probe of plasmonic structures that trap light to the nanoscale. Clear spectral polarization splittings are found to be directly related to the asymmetric morphology of nanocavities formed between faceted gold nanoparticles and an underlying gold substrate. Both experiment and simulation show the influence of geometry on the coupled system, with spectral shifts Δλ = 3 nm from single atoms. Analytical models allow us to identify the split resonances as transverse cavity modes, tightly confined to the nanogap. The direct correlation of resonance splitting with atomistic morphology allows mapping of subnanometre structures, which is crucial for progress in extreme nano-optics involving chemistry, nanophotonics, and quantum devices. Here are the dataset provided that contain all the information of the 4 figures of the article showing experimental as well as theoretical polarization dependent dark-field scattering of NPoM structures.

研究表明，偏振光学暗场光谱法（Polarized optical dark-field spectroscopy）是一种通用的非侵入式表征探针，可用于研究将光局域于纳米尺度的等离子体结构（plasmonic structures）。实验观测到清晰的光谱偏振分裂，其与带刻面金纳米颗粒（faceted gold nanoparticles）与衬底金（gold substrate）之间形成的纳米腔（nanocavities）的非对称形貌直接相关。实验与模拟均证实了几何构型对该耦合体系（coupled system）的调控作用，该体系的光谱位移Δλ=3纳米，源自单个原子的影响。通过解析模型（analytical models）可将该分裂共振归因为紧密束缚于纳米间隙（nanogap）的横向腔模（transverse cavity modes）。共振分裂（resonance splitting）与原子级形貌（atomistic morphology）的直接关联，可实现亚纳米结构（subnanometre structures）的成像测绘，这对于涉及化学、纳米光子学（nanophotonics）与量子器件（quantum devices）的极端纳米光学（extreme nano-optics）领域的发展至关重要。本文提供的数据集涵盖了本文中4幅插图的全部信息，这些插图展示了NPoM结构的偏振依赖性暗场散射的实验与理论结果。