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Role of short-range order in manipulating light absorption in disordered media

M. Q. Liu,C. Y. Zhao,B. X. Wang,X. Fang

Published 2018 in Journal of The Optical Society of America B-optical Physics

ABSTRACT

Structural correlations have a significant effect on light propagation in disordered media. We numerically investigate the role of short-range order in light absorption in thin films with disordered nanoholes. Two types of disordered distributions, including stealthy hyperuniform (SHU) and hard disk (HD) patterns with different degrees of short-range order, are studied. We find that Bragg scattering induced by short-range order results in the appearance of a gradually sharper absorption peak with the increasing of degrees of short-range order (χ,ϕ). A physical model is proposed to calculate the in-plane angularly differential scattering cross section dσ*/dθ of thin-film nanostructures with consideration of the structure factor S(q). Results reveal that a higher level of short-range order can enhance in-plane Bragg scattering in certain wavelengths and directions corresponding to rich and sharp peaks in the structure factor S(q), which can further modify morphology-dependent-like resonances of an individual scatterer and leads to a large improvement of absorptivity in thin films. Besides, the comparison results show that SHU structures exhibit better integrated absorption (IA) enhancement than both HD and periodic structures. And there is a transition of local-order phase between hexagonal lattices and square lattices for SHU structures, leading to an optimal absorption performance when χ is around 0.5 of interest. The present study paves the way to controlling light absorption and scattering using disordered nanostructures.

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