Light scattering by surface acoustic waves on corrugated metal surfaces

Optimization of Arrays of Gold Nanodisks for Plasmon-Mediated Brillouin Light Scattering

“…Robertson et al , found a similar role of reciprocal lattice vectors in the wavevector-conservation relation in SEBS measurements on corrugated continuous Ag films on a glass substrate. In that study, the detected phonons were in the Ag/substrate, since no other specimen was placed in contact with the Ag.…”

“…Inelastic scattering of higherwavevector components of these fields is expected to occur from acoustic waves or spin waves with correspondingly high wavevectors, and the associated energy loss may be effectively translated back to far-field backscattered light through reversed mediation of surface plasmons, in a manner similar to the twoway surface-plasmon mediation of SERS. 1 Robertson et al 11,12 found a similar role of reciprocal lattice vectors in the wavevector-conservation relation in SEBS measurements on corrugated continuous Ag films on a glass substrate. In that study, the detected phonons were in the Ag/ substrate, since no other specimen was placed in contact with the Ag.…”

“…The restriction of a narrow range of phonon wavevectors can be relaxed, and the need for a Kretschmann prism can be eliminated, by employing a periodically corrugated noble-metal film for plasmon mediation. 11,12 In a previous report, 13 we suggested that periodic arrays of noble-metal nanodisks or nanolines may provide a more flexible platform than the Kretschmann geometry or corrugated noblemetal films for SEBS, enabling measurements over a wider range of incident angles. Our measurements on gold-nanodisk arrays on glass provided evidence for modest enhancement (factors of 2-6) of phonon spectra from this structure over a relatively broad range of angles.…”

“…Equation 2 is also valid more generally for BLS from any structure that is elastically periodic in a plane (any twodimensional phononic crystal). [14][15][16] However, Robertson et al 12 showed that, in the case of corrugated Ag films, surface plasmons are intermediate states between photons and phonons. Their results, therefore, suggest that similar scattering involving reciprocal lattice vectors will occur if a specimen is placed in nanoscale contact with a noble-metal thin-film array.…”

Probing the Micromechanical Behavior of Semicrystalline Polypropylene Films by Brillouin Spectroscopy

“…In the field of nanotechnology patterned surfaces are often used in the fabrication of various devices. In few such nanostructured surfaces with a periodic submicrometer grating have the elastic excitations been studied by BS so far. − For Si surfaces patterned with shallow gratings, the dispersion plot ω( q ∥ ) reveals a small gap at the first surface Brillouin zone (π/ d ) and a hybridization between the surface acoustic modes when the scattering wave vector q ∥ parallel to the surface is perpendicular to the grating grooves . Besides these transverse and longitudinal surface modes, supported polystyrene films with deep gratings allow for the propagation of additional modes of unknown origin …”