Brillouin microscopy

As a first experimental example. Fig. 9.4 depicts the spatial distributions of sound velocity v and sound attenuation F across a blown film of poly(4-methyl-1-pentene) (P4MP-1, thickness 180 pm). There are two maxima at the surfaces and two adjacent local minima within the film. Then, the sound velocity decreases from left to right inside the fihn, indicating a different thermal or mechanical history in different parts of the P4MP-1. The sound velocity maxima 

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Mechanical Interphases in Epoxies as seen by Nondestructive High-Performance Brillouin Microscopy... 

Boundaries between a reactive polymer system, e.g. an epoxy, and solid substrates modify the mechanical properties of the polymer in the interface-near region. The so created interphases are of unexpected width up to several hundred pm. The recently developed Brillouin microscopy grants nondestructive access to the local mechanical properties within these interphases. It turns out that these mechanical interphases depend strongly on the kind of polymer system, the substrate material and the preparation conditions. 

In this paper, Brillouin microscopy (BM), an original technique which provides information about spatial variations of mechanical properties, is pre-... 

Fig. 9.3 Generalized scattering geometry for Brillouin microscopy. Notation indices i, s for incident and scattered quantities k, kj wave vectors of the laser light wave vector of the sound wave a, Uj and / i, fs. outer and inner angles of refraction 6 light-scattering angle gp glass plate n the refractive index.

J. K. Kruger, W. Possart, R. Bactavatcha-lou, U. Muller, T. Britz, R. Santuary, P. Alnot (2004). Gradient of the mechanical modulus in glass-epoxy-metal joints as measured by Brillouin microscopy. /. Adhesion, 80, 585—599. 

During the next lew years many techniV ues-oricnlcd scientists will he attracted to wink on LB Hints because they provide interesting novel structures whose molecular architecture can be systematically controlled, The quality of (he floating monolayer ts also important and needs to he characterized as does the interlace between the first deposited monolayer and ihe substrate. Fluorescence microscopy and Brillouin and Fourier transform infrared spectroscopies are currently being used to address these problems. 

Optical Visual inspection Optical microscopy Brillouin scattering Photoelasticity Projection moire Shearography Optical holography Using visible part of electromagnetic spectrum (wavelength roughly between 400 and 700 nm)... 

Also of importance are atomic-force microscopy, Brillouin scattering [55, 56], and pulse-propagation measixrements [55, 57], In the last of these techniques, the delay in pulses passing through the network is used to obtain information on the network structure. 

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