Acoustic wave modulation of gap plasmon cavities

The important role of metallic nanostructures in nanophotonics will expand if ways to electrically manipulate their optical resonances at high speed can be identified. We capitalized on electrically driven surface acoustic waves and the extreme light concentration afforded by gap plasmons to achieve this goal. We placed gold nanoparticles in a particle-on-mirror configuration with a few-nanometer-thick, compressible polymer spacer. Surface acoustic waves were then used to tune light scattering at speeds approaching the gigahertz regime. We observed evidence that the surface acoustic waves produced mechanical deformations in the polymer and that ensuing nonlinear mechanical dynamics led to unexpectedly large levels of strain and spectral tuning. Our approach provides a design strategy for electrically driven dynamic metasurfaces and fundamental explorations of high-frequency, polymer dynamics in ultraconfi ned geometries., , # Data from: Acoustic wave modulation of gap plasmon cavities

*Corresponding manuscript*: “Acoustic Wave Modulation of Gap Plasmon Cavities,” submitted to **Science**.

This repository contains all data, code, and simulation files required to reproduce the figures in the manuscript.
*Software versions*: **MATLAB R2023a**, **COMSOL Multiphysics 5.6**.
*Units*: SI unless otherwise noted.
File and folder names appear in monospace.

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### Data_for_Fig_1.zip

* `Matlab_sigma_sc_plotting.m`
*MATLAB script that plots the scattering cross section versus gap size and wavelength.*
* `NPoMsym15_lam_solve_5.3E-7_gap_4E-9_theta_0_facet_size_4E-8.mph`
* `NPoMsym15_lam_solve_6.7E-7_gap_4E-9_theta_0_facet_size_4E-8.mph`
*COMSOL 5.6 optical frequency‑domain simulations of the NPoM structure at normal incidence. Each file contains the full solution for a single wavelength, gap size, and facet size (all encoded in the filename).*
* `NPoMsym15_lam_solve_5p3Em7_gap_4Em9_theta_0_facet_size_4Em8.java`...,