Subterahertz hypersound attenuation in silica glass studied via picosecond acoustics | Zendy

Simon Ayrinhac | Zendy; Marie Foret | Zendy; A. Devos | Zendy; Benoît Rufflé | Zendy; E. Courtens | Zendy; R. Vacher | Zendy

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Subterahertz hypersound attenuation in silica glass studied via picosecond acoustics

Author(s) -

Simon Ayrinhac,

Marie Foret,

A. Devos,

Benoît Rufflé,

E. Courtens,

R. Vacher

Publication year - 2011

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.83.014204

Subject(s) - materials science , picosecond , attenuation , anharmonicity , silicon , acoustic attenuation , substrate (aquarium) , optics , absorption (acoustics) , signal (programming language) , transducer , optoelectronics , acoustics , laser , physics , composite material , oceanography , quantum mechanics , computer science , programming language , geology

International audienceWe 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

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