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Harmonic Nanoparticles for Regenerative Research
Published on: May 1, 2014
Coherent and incoherent second harmonic generation in planar G-shaped nanostructures
E A Mamonov1, T V Murzina, I A Kolmychek
1Department of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia. mamonov@shg.ru
Optics Letters
|September 21, 2011
Summary
G-shaped gold nanostructures exhibit strong azimuthal anisotropy in second harmonic generation (SHG). This effect arises from the anisotropic enhancement of fundamental light within the nanostructures, confirmed by simulations.
Area of Science:
- Plasmonics and Nanophotonics
- Nonlinear Optics
- Materials Science
Background:
- Second Harmonic Generation (SHG) is a key nonlinear optical process.
- Anisotropy in nanostructures can lead to directional light-matter interactions.
- G-shaped nanostructures offer unique plasmonic properties.
Purpose of the Study:
- To investigate the azimuthal anisotropy of SHG in G-shaped gold nanostructures.
- To analyze both coherent and incoherent components of the generated SHG.
- To understand the underlying physical mechanisms responsible for the observed anisotropy.
Main Methods:
- Experimental study of SHG from periodic arrays of G-shaped gold nanostructures.
- Measurement of Stokes parameters to characterize the polarization of SHG.
- Finite-difference time-domain (FDTD) simulations to model light interaction.
Main Results:
- Observed strong azimuthal anisotropy in both coherent and incoherent SHG.
- Demonstrated polarization-dependent SHG signals correlated with nanostructure geometry.
- FDTD calculations confirmed anisotropic enhancement of fundamental radiation.
Conclusions:
- G-shaped gold nanostructures exhibit significant polarization-dependent nonlinear optical response.
- The observed anisotropy is attributed to the plasmonic properties and geometry of the nanostructures.
- This work highlights the potential of tailored nanostructures for controlling nonlinear light generation.
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