# Energy transfer and radiation damping in gold–MAPbI3 heterostructures

## TL;DR

This paper studies how energy transfer and radiation damping occur in hybrid gold and perovskite structures using advanced imaging techniques.

## Contribution

The study introduces a novel method to visualize and quantify SPP modes in AuNS/MAPbI3 heterostructures using leakage radiation microscopy.

## Key findings

- AuNS/MAPbI3 systems show increased SPP attenuation due to energy transfer and radiation damping.
- Higher-order SPP modes are observed, enabling determination of their group velocities.

## Abstract

Coupling excitonic systems to propagating surface plasmon polaritons (SPPs) can potentially extend the length scale for energy transport. However, experimental visualization of these coupled states is challenging. Here, leakage radiation microscopy was used to examine the SPP modes in lithographically fabricated gold nanostripes (AuNS) coated with a thin film of methylammonium lead iodide (MAPbI3). By combining real-space and momentum-resolved back focal plane imaging with wavelength-tunable excitation, dispersion relations, group velocities, propagation lengths, and, consequently, dephasing rates were extracted for the SPP modes. Compared to the bare AuNS structures, the AuNS/MAPbI3 hybrid systems exhibit increased SPP attenuation, attributed to a combination of resonant energy transfer from the SPPs to the perovskite and increased radiation damping from the change in dielectric environment of the nanostripes. Higher-order SPP modes were also observed for the AuNS/MAPbI3 system, allowing their group velocities to be determined.

Coupling excitonic systems to propagating surface plasmon polaritons (SPPs) can potentially extend the length scale for energy transport.