Figure 1 | Graphical abstract of Lifshitz-like states phenomenology in Hyperuniform Disordered Photonic Networks. (IMAGE)
Caption
Figure 1 | Graphical abstract of Lifshitz-like states phenomenology in Hyperuniform Disordered Photonic Networks. A schematic of the two-dimensional hyperuniform disordered photonic network investigated in this work is shown, highlighting the underlying correlated disorder and two four-sided topological defects that support Lifshitz-like localized modes, here represented in a hybridized bonding configuration. A representative electromagnetic field distribution of the resulting photonic molecule is overlaid, illustrating light confinement around the defects and their spatial overlap. Hyperspectral maps were experimentally acquired with sub-diffraction resolution using an aperture SNOM tip in illumination/collection geometry, sketched on the left. On the right, the localization length is plotted for optical modes near the lower photonic bandgap edge for different degrees of structural order (blue to red, with red indicating the highest order considered). Three spectral regions can be distinguished. Region I corresponds to Lifshitz-like states, region II to conventional Anderson-localized modes, and region III to extended Anderson-like modes. In region II, localization length decreases as disorder increases, whereas region I shows the opposite trend, reflecting the different physical origin of the two localization mechanisms. Between regions I and II, the localization-length curves cross within a narrow spectral interval, marking the crossover between the two localization regimes. Region III is dominated by extended modes exhibiting spectral level repulsion.
Credit
Nicoletta Granchi et al.
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