Zip folder containing dataset for all main figures. Fig.1 is numerically simulated data by finite-difference time-domain calculation software (Lumerical Solutions). Fig.2 are optical images obtained using a CCD camera (Infinity 2). Fig.3 and Fig.4 are spectra data by bright/dark field spectroscopy. See the main manuscript (open access) for more details of how the data were generated, collected and processed.