a) PL SNOM maps of the an Anderson-localized mode in three HuD structures with increasing normalized wall thicknesses w = 0.415a, 0.461a and 0.5a (a = 380 nm), showing the same mode localization distribution across all three samples. The maps are filtered around the resonant wavelengths of respectively 1161.6, 1205.3 and 1245.8 nm. b) Corresponding SNOM topographies. c) PL spectra collected in the point of maximum intensity of the mode in each structure, showing a systematic red shift in resonance wavelength as wall thickness increases, in agreement with photonic crystal scaling laws. Right panel: experimental Q factors of the corresponding resonances for different values of w.