Robust purcell effect of CsPbI3 quantum dots using nonlocal plasmonic metasurfaces

Optoelectronic metadevices control and enhance light-matter interactions by modulating the local optical field that interacts with emitters. However, the optical property of the highly localized mode in the plasmonic metasurface is sensitive to local disorders arising from experimental fluctuations. Recently, the nonlocal mode of metasurfaces has been attracting growing interest because the coupling within the array of plasmonics results in long-range ordering and collective resonances. Here we demonstrate the topological edge states and the nonlocal modes of Au bow ties in a photonic crystal (PHC) lattice. The strong coupling between plasmonic modes and PHC bands opens the topological band gap at the edge of the Brillouin zone and forms the nonlocal mode having a resonant energy insensitive to fluctuations in Au length, resulting in a robust Purcell effect for quantum dots (QDs) coupling with the nonlocal mode in metadevices. The topological band gap and robust enhancement indicate gre..., , # Dryad dataset

Dataset DOI: [10.5061/dryad.5tb2rbpg7](10.5061/dryad.5tb2rbpg7)

## Description of the data and file structure

These datasets were collected using the confocal micro-photoluminescence (PL) setup for the spectroscopy of CsPbI3 quantum dots (QDs) on the plasmonic metasurface and on the bare substrate. By comparing the results on the metasurface and on the bare substrate, we observe the robust Purcell enhancement arising from the nonlocal mode of metasurface, including the polarization degree, polarization angle, and the enhanced emission rate.

Experiment.opju is the data for the observation of Purcell enhancement. This file can be viewed in [The Origin Viewer](https://www.originlab.com/viewer/).

* The book \"1 PL of QDs on bare substrate\" is the PL spectrum of QDs on the bare substrate, corresponding to Fig. 4(a) in the paper.
* The book \"2 polarization-dependent intensity\" is the polarization angle-dependent PL intensity. By fitting with the sine function, we get the p...,