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One-Dimensional Hypersonic Phononic Crystals

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N. Gomopoulos†, D. Maschke‡, C. Y. Koh§, E. L. Thomas§, W. Tremel‡, H.-J. Butt† and G. Fytas*†

^† Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany

^‡ Department of Chemistry, Johannes Gutenberg-Universität, Duesbergweg 10-14, 55099 Mainz, Germany

^§ Institute for Soldier Nanotechnologies, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Department of Materials Science & F.O.R.T.H., P.O. Box 1527, 71110 Heraklion, Greece

Nano Lett., 2010, 10 (3), pp 980–984

DOI: 10.1021/nl903959r

Publication Date (Web): February 8, 2010

* To whom correspondence should be addressed. E-mail: fytas@iesl.forth.gr.

Section:

Optical, Electron, and Mass Spectroscopy and Other Related Properties

Abstract

We report experimental observation of a normal incidence phononic band gap in one-dimensional periodic (SiO₂/poly(methyl methacrylate)) multilayer film at gigahertz frequencies using Brillouin spectroscopy. The band gap to midgap ratio of 0.30 occurs for elastic wave propagation along the periodicity direction, whereas for inplane propagation the system displays an effective medium behavior. The phononic properties are well captured by numerical simulations. The porosity in the silica layers presents a structural scaffold for the introduction of secondary active media for potential coupling between phonons and other excitations, such as photons and electrons.

Keywords:

Periodic materials; photonic crystals; dispersion relations; mechanical properties; Brillouin spectroscopy

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