Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 110, Issue 40, Pages 15886-15891Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1307879110
Keywords
disordered bandgap materials; dielectric heterostructures; disordered structures; amorphous materials
Categories
Funding
- Research Corporation for Science Advancement [10626]
- San Francisco State University Start-Up Fund
- National Science Foundation [DMR-1105417]
- New York University-Materials Research Science and Engineering Center Program [DMR-0820341, DMR-0606415, ECCS-1041083]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1105417] Funding Source: National Science Foundation
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Recently, disordered photonic media and random textured surfaces have attracted increasing attention as strong light diffusers with broadband and wide-angle properties. We report the experimental realization of an isotropic complete photonic band gap (PBG) in a 2D disordered dielectric structure. This structure is designed by a constrained optimization method, which combines advantages of both isotropy due to disorder and controlled scattering properties due to low-density fluctuations (hyperuniformity) and uniform local topology. Our experiments use a modular design composed of Al2O3 walls and cylinders arranged in a hyperuniform disordered network. We observe a complete PBG in the microwave region, in good agreement with theoretical simulations, and show that the intrinsic isotropy of this unique class of PBG materials enables remarkable design freedom, including the realization of waveguides with arbitrary bending angles impossible in photonic crystals. This experimental verification of a complete PBG and realization of functional defects in this unique class of materials demonstrate their potential as building blocks for precise manipulation of photons in planar optical microcircuits and has implications for disordered acoustic and electronic band gap materials.
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