Acoustic properties of colloidal crystals

Details Acoustic properties of colloidal crystals Acoustic properties of colloidal crystals

2001-10-30

arxiv.org/abs/cond-mat/0110617v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 9 figures, prb approved

Scientific paper

10.1103/PhysRevB.65.064307

We present a systematic study of the frequency band structure of acoustic waves in crystals consisting of nonoverlapping solid spheres in a fluid. We consider colloidal crystals consisting of polystyrene spheres in water, and an opal consisting of close-packed silica spheres in air. The opal exhibits an omnidirectional frequency gap of considerable width; the colloidal crystals do not. The physical origin of the bands are discussed for each case in some detail. We present also results on the transmittance of finite slabs of the above crystals.

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