Engineered hyperuniformity for directional light extraction
Sean Gorsky,Wesley A. Britton,Yuyao Chen,J. Montaner,Alan Lenef,Madis Raukas,L. Dal Negro +6 more
- Vol. 4, Iss: 11, pp 110801
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TLDR
In this article, the authors design and experimentally demonstrate novel scattering arrays of dielectric nanoparticles, referred to as optimized isotropic scattering arrays (OISAs), which give rise to ring-shaped regions in Fourier space (k-space), with intensity optimized by the collective coordinate optimization method.Abstract:
By leveraging the concept of isotropic stealthy hyperuniform arrays (ISHAs), in this paper, we design and experimentally demonstrate novel scattering arrays of dielectric nanoparticles, here referred to as optimized isotropic scattering arrays (OISAs), which give rise to ring-shaped regions in Fourier space (k-space), with intensity optimized by the collective coordinate optimization method. These arrays feature the ideal circular k-space structure required to achieve enhanced directional light extraction from light emitting devices (LEDs), with significantly reduced diffuse scattering compared with both Poisson random point patterns and Vogel spiral arrays. Enhanced directional emission from OISAs is demonstrated experimentally on large-scale arrays (1 × 1 mm2) of TiO2 nanoparticles fabricated atop LED ceramic converter materials. The enhanced directional light emission of OISAs of dielectric nanoparticles demonstrated in this work make them very attractive candidates for integration with commercially available LED active materials.read more
Citations
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Cloaking the underlying long-range order of randomly perturbed lattices.
TL;DR: In this article, the authors demonstrate how the Bragg peaks of the original lattice can be hidden in the effective diffraction pattern of independent and identically distributed perturbations, where the underlying long-range order is then "cloaked" in the sense that it cannot be reconstructed from the pair correlation function alone.
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Nonlocal Effective Electromagnetic Wave Characteristics of Composite Media: Beyond the Quasistatic Regime
Salvatore Torquato,Jaeuk Kim +1 more
TL;DR: In this paper, a new theoretical framework overcomes those limitations by predicting effective characteristics of electromagnetic waves in composite media is proposed, which is an old problem with limited solutions, and it can be used to predict effective properties of composite media.
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Predicting transport characteristics of hyperuniform porous media via rigorous microstructure-property relations
TL;DR: In this paper, the authors employed rigorous methods to estimate the fluid permeability and these other transport properties of fluid-saturated porous media via rigorous microstructure-property relations.
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Structural characterization of many-particle systems on approach to hyperuniform states
TL;DR: In this article, the authors explore the exploration of quantitative descriptors that herald when a many-particle system in Euclidean space approaches a hyperuniform state as a function of the relevant control parameter.
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Subdiffusive light transport in three-dimensional subrandom arrays
Fabrizio Sgrignuoli,L. Dal Negro +1 more
TL;DR: In this article, the authors investigated light transport in three-dimensional scattering systems generated according to subrandom sequences and demonstrate subdiffusive behavior typical of wave transport in disordered systems at the critical point for metal-insulator-transitions but in a wider range of parameters.
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