Surface plasmon resonances of metallic nanostars/nanoflowers for surface-enhanced Raman scattering

摘要

We investigate theoretically the optical properties associated to plasmonresonances of metal nanowires with cross section given by low-order Chebyshevnanoparticles (like rounded-tip nanostars or nanoflowers). The impact of thenanoflower shape is analyzed for varying symmetry and deformation parameterthrough the spectral dependence of resonances, and their corresponding nearfield distributions. Large field intensity enhancements are obtained at thegaps between petals, apart from the tips themselves, which make thesenanostars/nanoflowers specially suitable to host molecules for SERS sensingapplications.