Full details of the methodology may be found in the supplementary information of the associated paper.

.CSV files were recorded with an oscilloscope using the setups in Figures 2 and 6a of the paper.

Extinction spectra were recorded with a commercial Applied Photophysics Chirascan. All spectra were recorded over the range of 300 nm – 1100 nm with a resolution of 1 nm. 

AFM profile was obtained with a Multimode Scanning Probe Microscope (Veeco, Plainview, NY) with a Nanoscope IIIA controller in contact mode in ambient conditions.