Hyperuniform geometries feature correlated disordered topologies which follow from a tailored k-space design. Here, we study gold plasmonic hyperuniform disordered surfaces and, by momentum spectroscopy, we report evidence of k-space engineering on both light scattering and light emission. Even if the structures lack a well-defined periodicity, emission and scattering are directional in ring.

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Heterogeneous materials consisting of different phases are ideally suited to achieve a broad spectrum of desirable bulk physical properties by combining the best features of the constituents through the strategic spatial arrangement of the different phases. Disordered hyperuniform heterogeneous materials are new, exotic amorphous matter that behave like crystals in the manner in which they suppress volume-fraction fluctuations at large length scales, and yet are isotropic with no Bragg peaks. In this paper, we formulate for the first time a Fourier-space numerical construction procedure to design at will a wide class of disordered hyperuniform two-phase materials with prescribed spectral densities, which enables one to tune the degree and length scales at which this suppression occurs. We demonstrate that the anomalous suppression of volume-fraction fluctuations in such two-phase materials endow them with novel and often optimal transport and electromagnetic properties. Specifically, we construct a family of phase-inversion-symmetric materials with variable topological connectedness properties that remarkably achieves a well-known explicit formula for the effective electrical (thermal) conductivity.

Moreover, we design disordered stealthy hyperuniform dispersion that possesses nearly optimal effective conductivity while being statistically isotropic. Interestingly, all of our designed materials are transparent to electromagnetic radiation for certain wavelengths, which is a common attribute of all hyperuniform materials. Our constructed materials can be readily realized by 3D printing and lithographic technologies.

We expect that our designs will be potentially useful for energy-saving materials, batteries and aerospace applications.

Professor Salvatore TorquatoDept. Of Chemistry, Dept. Of Physics, Princeton Institute for the Science and Technology of Materials, and Applied & Computational MathematicsPrinceton UniversityThursday, June 7, 15:30 - 16:30Building 227, Room A202GaithersburgThursday, June 7, 13:30 - 14:30Building 1 Room 4058BoulderHost: Michael MascagniAbstract: While there are four commonly observed states of matter (solid crystal, liquid, gas, and plasma), we have known for some time now that there exist many other forms of matter. Disordered hyperuniform many-particle systems 1 can be regarded to be new states of disordered matter in that they behave more like crystals or quasicrystals in the manner in which they suppress large-scale density fluctuations, and yet are also like liquids and glasses because they are statistically isotropic structures with no Bragg peaks. Thus, disordered hyperuniform systems can be regarded to possess a 'hidden order' that is not apparent on short length scales. I will describe a variety of different examples of such disordered states of matter that arise in physics, materials science, mathematics and biology. Among other results, I will describe classical ground states that are disordered, hyperuniform and highly degenerate over a wide range of densities up to some critical density, below which the system undergoes a phase transition to ordered states 2.

Disordered hyperuniform systems appear to be endowed with novel physical properties, including complete photonic band gaps comparable in size to those in photonic crystals 3, improved electronic band-gap properties 4 and optimal transport properties 5. Moreover, we have shown that photoreceptor cell patterns in avian retina have evolved to be disordered and hyperuniform 6.1. Torquato and F. Stillinger, 'Local Density Fluctuations, Hyperuniform Systems, and Order Metrics,' Phys.

E, 68, 041113 (2003).2. Zhang, and F. Stillinger, 'Ensemble Theory for Stealthy Hyperuniform Disordered Ground States,' Phys.

X, 5,021020 (2015).3. Torquato and P. Steinhardt, 'Designer Disordered Materials with Large, Complete Photonic Band Gaps,' Proc.

Sci., 106, 20658 (2009).4. Steinhardt, and S. Torquato, 'Nearly Hyperuniform Network Models of Amorphous Silicon, Phys. B, 87, 245204 (2013).5.

Stillinger, and S. Torquato, 'Transport, Geometrical, and Topological Properties of Stealthy Disordered Hyperuniform Two-phase Systems,' J. Phys., 145, 244109 (2016).6.

Haztzikirou, M. Meyer-Hermann, J.

Crackdown 1 dlc. Corbo, and S. Torquato, Avian Photoreceptor Patterns Represent a Disordered Hyperuniform Solution to a Multiscale Packing Problem, Phys. E, 89, 022721 (2014).Bio: Salvatore Torquato is a Professor in Chemistry and the Princeton Institute for the Science and Technology of Materials. He is also affiliated with three other departments: Physics, Applied and Computational Mathematics, and Mechanical and Aerospace Engineering. He has been a Senior Faculty Fellow in the Princeton Center for Theoretical Science. Torquato's research work in theoretical physics is centered in statistical mechanics and soft condensed matter theory. A common theme of his research is the search for unifying and rigorous principles to elucidate a broad range of physical phenomena.

His current work focuses on self-assembly theory, disordered and ordered particle packings, liquids, glasses, quasicrystals, crystals, hyperuniform materials, design of materials via inverse optimization techniques, and cancer modeling. He has published 400 journal refereed articles and a book entitled 'Random Heterogeneous Materials.'

Among other awards and honors, he is a Fellow of the American Physical Society (APS), Society for Industrial and Applied Mathematics (SIAM) and American Society of Mechanical Engineers (ASME). He has been the recipient of the ACS Joel Hildebrand Award in Theoretical Chemistry of Liquids, APS David Adler Lectureship Award in Material Physics, SIAM Ralph E. Kleinman Prize, Society of Engineering Science William Prager Medal and ASME Richards Memorial Award. He was a Guggenheim Fellow and was thrice a Member of the Institute for Advanced Study. He recently received a Simons Foundation Fellowship in Theoretical Physics.Note: Visitors from outside NIST must contact Cathy Graham; (301) 975-3800; at least 24 hours in advance.