Schneider, D. and Liaqat, F. and El Boudouti, E.H. and El Hassouani, Y. and Djafari-Rouhani, B. and Tremel, W. and Butt, H.-J. and Fytas, G. (2012) Engineering the hypersonic phononic band gap of hybrid bragg stacks. Nano Letters, 12 (6). pp. 3101-3108.

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We report on the full control of phononic band diagrams for periodic stacks of alternating layers of poly(methyl methacrylate) and porous silica combining Brillouin light scattering spectroscopy and theoretical calculations. These structures exhibit large and robust on-axis band gaps determined by the longitudinal sound velocities, densities, and spacing ratio. A facile tuning of the gap width is realized at oblique incidence utilizing the vector nature of the elastic wave propagation. Off-axis propagation involves sagittal waves in the individual layers, allowing access to shear moduli at nanoscale. The full theoretical description discerns the most important features of the hypersonic one-dimensional crystals forward to a detailed understanding, a precondition to engineer dispersion relations in such structures. © 2012 American Chemical Society.

Item Type: Article
Uncontrolled Keywords: Alternating layers; Band diagrams; Bragg stacks; Brillouin light scattering; Brillouin spectroscopy; Dispersion relations; Full control; Gap widths; Longitudinal sound; Nano scale; Oblique incidence; Off-axis propagation; One-dimensional crystals; Periodic stacks; Phononic band gaps; Phononics; Porous silica; Spacing ratio; Theoretical calculations; Vector nature, Energy gap; Esters; Silica; Superlattices, Brillouin scattering, nanomaterial, article; chemical model; chemistry; computer simulation; light; methodology; particle size; radiation scattering; refractometry; ultrastructure, Computer Simulation; Light; Models, Chemical; Nanostructures; Particle Size; Refractometry; Scattering, Radiation
Subjects: Chemical Engineering
Divisions: SCIENTIFIC PRODUCTION > Chemical Engineering
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:45

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