  In the present paper, we utilize the coupled-oscillator model describing the
hybridization of optical phonons in touching and/or overlapping particles in
order to study the Raman spectra of nanoparticles organized into various types
of regular and random arrays including nanosolids, porous media, and
agglomerates with tightly bonded particles. For the nanocrystal solids, we
demonstrate that the ratio of the size variance to the coupling strength allows
us to judge the character (localized or propagating) of the optical phonon
modes which left the particles of their origin and spread throughout an array.
The relation between the shift and the broadening of the Raman peak and the
coupling strength and the disorder is established for nanocrystal solids,
agglomerates, and porous media providing us with information about the array
structure, the structure of its constituents, and the properties of optical
phonons.
