Materials that can mold the ?ow of elastic waves of certain energy
in certain directions are called phononic materials. The present
thesis deals essentially with such phononic systems, which are
structured in the mesoscale (\1 lm), and with their individual
components. Such systems show interesting phononic properties in
the hypersonic region, i.e., at frequencies in the GHz range. It is
shown that colloidal systems are excellent model systems for the
realization of such phononic materials. Therefore, different
structures and particle architectures are investigated by Brillouin
light scattering, the inelastic scattering of light by phonons.
Both the mechanical properties of the individual colloidal
particles, which manifest in their resonance vibrations
(eigenmodes), as well as the acoustic propagation in colloidal
structures have been investigated. The measurement of the
eigenmodes allows for new insights into physical properties at the
mesoscale, e.g., con?nement effects, copolymer behavior, or the
non-destructive determination of nanomechanical properties of
core-shell particles, supporting the working groups aim to achieve
a deeper understanding of 'soft mechanics' at small length scales.
Another novel contribution assigned to this thesis is the ?rst
experimental rea- zation of a phononic band gap arising from the
interaction of these particle - genmodes with the effective medium
band (hybridization gap). This ?nding already gave new impulses to
the whole ?eld of phononics.
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