Hyperuniformity and wave localization in pinwheel scattering arrays

TL;DR

This paper explores the structural and spectral properties of pinwheel tiling arrays, revealing their weak hyperuniformity and demonstrating a transition from wave diffusion to localization, with implications for light-matter interaction engineering.

Contribution

It introduces the analysis of hyperuniformity in pinwheel arrays and demonstrates wave localization phenomena using Green's matrix theory, highlighting their potential for optical applications.

Findings

Pinwheel arrays are weakly hyperuniform.

A transition from diffusive transport to wave localization is observed.

Spectral gaps and long-range order are identified despite lack of diffraction peaks.

Abstract

We investigate the structural and spectral properties of deterministic aperiodic arrays designed from the statistically isotropic pinwheel tiling. By studying the scaling of the cumulative integral of its structure factor in combination with higher-order structural correlation analysis we conclude that pinwheel arrays belong to the weakly hyperuniformity class. Moreover, by solving the multiple scattering problem for electric point dipoles using the rigorous Green's matrix theory, we demonstrate a clear transition from diffusive transport to localization behavior. This is shown by studying the Thouless number as a function of the scattering strength and the spectral statistics of the scattering resonances. Surprisingly, despite the absence of sharp diffraction peaks, clear spectral gaps are discovered in the density of states of pinwheel arrays that manifest a distinctive long-range order. Furthermore, the level spacing statistics at large optical density exhibits a sharp transition from level repulsion to the Poisson behavior, consistently with the onset of the wave localization regime. Our findings reveal the importance of hyperuniform aperiodic structures with statistically isotropic k-space for the engineering of enhanced light-matter interaction and localization properties.