Investigatation of the Cluster-To-Layer Transition of Au on Nacl by Brillouin Scattering (CAT#: STEM-ST-0101-YJL)

Introduction

Acoustic surface wave excitations of supported homogeneous, continuous layers have been studied in recent years quite extensively by means of Brillouin scattering. However, there remains still the open question concerning the behavior of these excitations when the layer becomes inhomogeneous or even disintegrates into islands or clusters. <br />A softening in the dispersion of the first order localized Sezawa mode with decreasing layer thickness indicates the transition from a continuous to a discontinuous or island layer. In the cluster regime a new type of acoustic surface mode is observed at frequencies above the transverse acoustic (TA) phonon frequency of the substrate.

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Principle Applications Procedure Materials Notes Related Products

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.

Applications

Brillouin scattering is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Brillouin scattering measurement system (Brillouin spectrometer)

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