Engineering the Hypersonic Phononic Band Gap of Hybrid Bragg Stacks

被引：63

作者：

Schneider, Dirk ^{[1
]}

Liaqat, Faroha ^{[2
]}

El Boudouti, El Houssaine ^{[3
]}

El Hassouani, Youssef ^{[4
]}

Djafari-Rouhani, Bahram ^{[5
]}

Tremel, Wolfgang ^{[2
]}

Butt, Hans-Juergen ^{[1
]}

Fytas, George ^{[1
,6
,7
]}

机构：

[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

[2] Johannes Gutenberg Univ Mainz, D-55128 Mainz, Germany

[3] Univ Mohamed I, Fac Sci, Dept Phys, LDOM, Oujda 60000, Morocco

[4] Univ Moulay Ismail, Fac Sci & Tech, Dept Phys, Boutalamine 52000, Errachidia, Morocco

[5] Univ Lille 1, CNRS, UMR 8520, UFR Phys,IEMN, F-59655 Villeneuve Dascq, France

[6] Univ Crete, Dept Mat Sci, Iraklion 71110, Greece

[7] FORTH, Iraklion 71110, Greece

来源：

NANO LETTERS | 2012年 / 12卷 / 06期

关键词：

Phononics; band gap; superlattices; hypersound propagation; Brillouin spectroscopy; FOLDED ACOUSTIC PHONONS; ELASTIC-WAVES; SCATTERING;

D O I：

10.1021/nl300982d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：3101 / 3108

页数：8

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