We review our work on second-order nonlinear optical
properties of plasmonic nanostructures. In order to
achieve the required non-centrosymmetry of the
structures, our samples consist of arrays of L-shaped
nanoparticles and T-shaped nanodimers. The samples are
investigated by polarization-dependent second-harmonic
generation to address the tensorial nonlinear response.
We show that the response can be strongly modified by
symmetry-breaking defects and other deviations of the
samples from ideal. Nonlinear sources localized to
defects can also give rise to higher-multipolar emission.
The defect problem is overcome with a recent and
significant improvement in sample quality, allowing the
dipole limit of the nonlinear response to be reached.
This achievement opens the path towards plasmonic
metamaterials with tailorable nonlinear properties. As a
demonstration of this possibility, we modify the
nonlinear response by the mutual arrangement of the
L-shaped particles in the array. We will also summarize
our numerical boundary-element method to describe the
nonlinear response of nanoparticles.
|Title of host publication||Plasmonics|
|Subtitle of host publication||Theory and Applications|
|Editors||Tigran V. Shahbazyan, Mark I. Stockman|
|ISBN (Print)||978-94-007-7804-7, 978-94-024-0586-6|
|Publication status||Published - 2013|
|MoE publication type||B2 Part of a book or another research book|
|Series||Challenges and Advances in Computational Chemistry and Physics|
- surface plasmon
- nonlinear optics
- second harmonic generation