Here, we studied the nonlinear optical response, especially second-harmonic generation (SHG), from isolated ion-shaped metallic NPs. In fact, SHG scale with a high power of the optical field and they can be significantly enhanced by strong local-fields near NPs. The localized surface plasmon resonance (LSPR) of isolated metallic NPs can plays a crucial role in such local-field enhancement. Because, the local-field distribution depends on subtle details of the geometry of the NPs, the SHG could be tailored by varying the shape of NP. Additional to that the excitation field becomes even more important when truly 3D NPs with plasmon oscillations in all spatial directions are considered, witch offering additional degrees of freedom for engineering the field distributions on the nanoscale.
We show that SHG efficiency can be tailored on such structures and is helpful in understanding optical processes in the nanoscale using the ion-shaped NPs. Using two different polarizations: linear and radial polarization we realized a study on the efficiency of the nonlinear responses of 3D orientation of gold NPs in the space.
This work demonstrates the possibility to use ion irradiation as tool for the controllable fabrication of the metallic nanostructures. Our results suggest that these ion-beam shaped composite media have potential applications spanning from nonlinear optical material, plasmonic photovoltaics, to bio-sensing and SERS spectroscopies.
|Title of host publication||8th International Conference on Materials for Advanced Technologies (ICMAT 2015), Jun 2015, Suntec, Singapore|
|Publication status||Published - 1 Jul 2015|
|Publication type||B3 Non-refereed article in conference proceedings|