Descriptions of Datasets: Figure 1. Thermal induced switching of the plasmons in ANT-on-mirror (ANToM). (a) Schematic switching and dark field images (3µm square) at 25°C and 40°C. (b) Scattering spectra of ANToM between 25°C and 40°C. (c) Reversible switching of coupled plasmons through many cycles of heating and cooling. (d) Change of the coupled plasmons while slowly ramping temperature, vertical dashed line shows measured PNIPAM phase transition temperature. Figure 2. Scattering spectra from FDTD simulations of ANToM for different gap sizes at (a) 25°C (n=1.34, cold) and (b) 40°C (n=1.42, hot), and (c) for fixed 3nm gap with these different refractive indexes in the ANToM gap. (d) Plasmon resonance wavelength vs gap size in cold (black) and hot (orange) states. Figure 3. Light-induced thermal oscillation of individual ANToM. (a) Schematic of switching in laser-irradiated ANToM, insets show corresponding dark-field images (3µm square). (b) Change of scattering spectra with laser on and off. (c) Switching of scattering spectra from ANToM with laser on/off over many cycles. (d) Scattering spectra of ANToM at increasing irradiation powers. Figure 4. High-speed single ANToM modulation. (a) Laser switching by modulating the drive voltage gives (b) dynamics of dark field scattering, spectrally integrated over 550nm