Surface response of spherical core-shell structured nanoparticle by   optically induced elastic oscillations of soft shell against hard core
  The optically induced oscillatory response of a spherical two-component, shell-core structured, nanoparticle by nodeless elastic vibrations of soft peripheral shell against hard and dynamically immobile inner core is considered. The eigenfrequencies of the even-parity, spheroidal and odd-parity torsional vibrational modes trapped in the finite-depth shell are obtained which are of practical interest for modal specification of individual resonances in spectra of resonant scattering of long wavelength electromagnetic waves by ultrafine particles. 
S.I. Bastrukov, P.-Y. Lai, I.V. Molodtsova, H.-K. Chang and D.V.   Podgainy