Dataset for "Real-space observation of flat-band ultrastrong coupling between optical phonons and surface plasmon polaritons"

Dataset for "Real-space observation of flat-band ultrastrong coupling between optical phonons and surface plasmon polaritons" Authors: Edoardo Vicentini, Xabier Arrieta, Martin Schnell, Nicolas Pajusco, Felix Begemann, Maria Barra Burillo, Maria Ramos, Andrei Bylinkin, Ruben Esteban, Javier Aizpurua and Rainer Hillenbrand Publication Date: November XX, 2025 DOI: https://doi.org/10.5281/zenodo.17233543 Journal Article: https://doi.org/10.1038/s41563-025-02412-6 Contact info: For any questions or issues, please reach out via email: [email protected] Description This folder contains all the data and the code that allows to replicate the figures in the paper "Real-space observation of flat-band ultrastrong coupling between optical phonons and surface plasmon polaritons". The dataset includes • Original experimental data: Spectra acquired using a scattering-type near-field optical microscope (sSNOM). • Excel_data: A folder containing excel files with the data points relative to all figure present both in the main text and the supplementary information. • Fig. XX folders: Each folder includes all the MATLAB scripts for data processing and figure generation. Usage Instructions • Raw data are grouped inside folders labelled according to the related figure in the paper "Real-space observation of flat-band ultrastrong coupling between optical phonons and surface plasmon polaritons". • Data can be loaded and processed by running the MATLAB script “FigureXX.m” or “SupplementaryFigureXX.m” present inside each folder “Figure XX”. Citation If you use this dataset in your research, please cite the paper and the dataset as follows: Paper Citation: Vicentini, E. et al. Real-space observation of flat-band ultrastrong coupling between optical phonons and surface plasmon polaritons, Nature Materials X(X). https://doi.org/10.1038/s41563-025-02412-6 Dataset Citation: Vicentini, E. Dataset for "Real-space observation of flat-band ultrastrong coupling between optical phonons and surface plasmon polaritons", Zenodo. https://doi.org/10.5281/zenodo.17233543 License This dataset is made available under the Creative Commons Attribution 4.0 International (CC BY 4.0) You are free to share, adapt, and use this dataset, provided appropriate credit is given.