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Updated: Jul 7, 2026

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces
Published on: July 26, 2016
Acousto-optic interaction in a non-homogeneous acoustic field excited by a wedge-shaped transducer
Vladimir I Balakshy1, Bogumil B J Linde, Anna N Vostrikova
1Moscow State University, Department of Physics, Vorobyevy Gory 1, 119991 Moscow, Russia. balakshy@phys.msu.ru
Abstract:
The article is devoted to theoretical analysis of light diffraction in a non-homogeneous acoustic field created by a wedge-shaped piezoelectric transducer. Relationships describing electrical, acoustic and acousto-optic properties of the acousto-optic cell are derived in the approximation of a small thickness of the piezoelectric plate. Principal characteristics of acousto-optic interaction are examined such as dependences of the light diffraction efficiency on the phase mismatch and the acoustic wave amplitude. It is shown that the acoustic field has a complicated amplitude-phase structure changing with the acoustic frequency. It is demonstrated that the diffraction efficiency in the Bragg regime can approach 100% in spite of a noticeable phase mismatch. The appropriate optimal values of ultrasound power and incidence angles of light are found.
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