Designing Phoxonic Metamaterials with Fractal Geometry

ORAL

Abstract

Recently, the concepts of fractal geometry have been introduced into electromagnetic and plasmonic metamaterials. With their self-similarity, structures based on fractal geometry should exhibit multi-band character with high Q factors due to the scaling law. However, there exist few studies of \textit{phononic }metamaterials based on fractal geometry. We use COMSOL to investigate the wave propagation in two dimensional systems possessing fractal geometries. The simulations of these systems, guided by our recently developed general design framework, help to understand the role of design in determining the phononic properties of the structures. Proposed structures are being fabricated via standard lithographic or 3D printing techniques. The wave behavior of the structures can be characterized using Brillouin Light Scattering, Scanning Acoustic Microscope and Near-field Scanning Optical Microscopy. Due to their sparse spatial distribution, fractal phononic structures show potential fir ``smart skin'', where multifunctional components can be fabricated on the same platform.

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Authors

  • Sisi Ni

    Institute for Soldier Nanotechnologies, Department of Materials Science and Engineering, Massachusetts Institute of Technology,

  • Cheong Yang Koh

    Defense Science Organization, Singapore

  • Steve Kooi

    Institute for Soldier Nanotechnologies, Department of Materials Science and Engineering, Massachusetts Institute of Technology,

  • Edwin Thomas

    Rice University, School of Engineering, Rice University, P.O. Box 1892, Houston, Texas 77251, USA, Department of Mechanical Engineering and Materials Science, Rice University, Institute for Soldier Nanotechnologies, Department of Materials Science and Engineering, Massachusetts Institute of Technology,