Simultaneous occurrence of structure-directed and particle-resonance-induced phononic gaps in colloidal films

被引：116

作者：

Still, T. ^{[1
]}

Cheng, W. ^{[1
]}

Retsch, M. ^{[1
]}

Sainidou, R. ^{[2
]}

Wang, J. ^{[1
,3
,4
]}

Jonas, U. ^{[1
]}

Stefanou, N. ^{[5
]}

Fytas, G. ^{[1
,3
,4
]}

机构：

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

[2] CSIC, Inst Opt, E-28006 Madrid, Spain

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

[4] FORTH, Iraklion 71110, Greece

[5] Univ Athens, Sect Solid State Phys, Athens 15784, Greece

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.100.194301

中图分类号：

O4 [物理学];

学科分类号：

0702 [物理学];

摘要：

We report on the observation of two hypersonic phononic gaps of different nature in three-dimensional colloidal films of nanospheres using Brillouin light scattering. One is a Bragg gap occurring at the edge of the first Brillouin zone along a high-symmetry crystal direction. The other is a hybridization gap in crystalline and amorphous films, originating from the interaction of the band of quadrupole particle eigenmodes with the acoustic effective-medium band, and its frequency position compares well with the computed lowest eigenfrequency. Structural disorder eliminates the Bragg gap, while the hybridization gap is robust.

引用

页数：4

共 35 条

[1]

Tailoring of phononic band structures in colloidal crystals [J].