Subterahertz hypersound attenuation in silica glass studied via picosecond acoustics

被引：34

作者：

Ayrinhac, S. ^{[1
]}

Foret, M. ^{[2
]}

Devos, A. ^{[1
]}

Ruffle, B. ^{[2
]}

Courtens, E. ^{[2
]}

Vacher, R. ^{[2
]}

机构：

[1] CNRS, Inst Elect Microelect & Nanotechnol, UMR 8250, F-59652 Villeneuve Dascq, France

[2] Univ Montpellier 2, Lab Colloides Verres & Nanomat, CNRS, UMR 5587, F-34095 Montpellier 5, France

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 01期

关键词：

VITREOUS SILICA; THERMAL-CONDUCTIVITY; BRILLOUIN-SCATTERING; LOW-TEMPERATURES; PHONONS; RELAXATION; MODES; LIGHT;

D O I：

10.1103/PhysRevB.83.014204

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report picosecond acoustic measurements in silica-glass films grown by wet thermal oxidation on a (111) silicon substrate. The longitudinal acoustic phonons are observed over the range from 150 to 300 GHz using an infrared pump and a second harmonic blue probe. The transducer is an aluminum thin film deposited on top. Multiple interference effects are analyzed and fully taken into account. They lead to a signal presenting rapid oscillations as a function of the sample thicknesses. The latter are determined by separate interferometry. Our remarkably precise acoustic attenuation results are found to follow rather well a model combining thermally activated relaxations and anharmonicity. New values for the optical absorption of silicon in the 400-to-500-nm region of the spectrum are obtained as a by-product.

引用

页数：13

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