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Harmonic Nanoparticles for Regenerative Research
Published on: May 1, 2014
Multipolar second harmonic generation from planar arrays of Au nanoparticles
Antonio Capretti1, Gary F Walsh, Salvatore Minissale
1Department of Electrical and Computer Engineering and Photonics Center, Boston University, Boston, Massachussetts 02215, USA.
Optics Express
|July 10, 2012
Summary
We achieved tunable optical Second Harmonic Generation (SHG) in gold nanoparticle arrays. Aperiodic spiral arrangements maximized the SHG signal, enabling new nanophotonic devices.
Area of Science:
- Plasmonics and Nanophotonics
- Nonlinear Optics
- Materials Science
Background:
- Second Harmonic Generation (SHG) is a key nonlinear optical process.
- Controlling SHG in plasmonic nanostructures is crucial for nanophotonics.
- Understanding plasmonic coupling and photonic interactions is vital for signal enhancement.
Purpose of the Study:
- To demonstrate and engineer optical Second Harmonic Generation (SHG) in planar arrays of gold nanoparticles.
- To investigate the influence of periodic and aperiodic geometries on SHG.
- To explore the roles of near-field plasmonic coupling and long-range photonic interactions.
Main Methods:
- Fabrication of planar arrays of cylindrical gold nanoparticles in various geometries.
- Systematic variation of interparticle separation.
- Polarization-resolved measurements using femtosecond pulsed laser pumping.
Main Results:
- Demonstration of tunable multipolar SHG signal dependent on array geometry.
- SHG signal intensity is maximized in aperiodic spiral gold nanoparticle arrays.
- Insights into the interplay between plasmonic coupling and photonic interactions.
Conclusions:
- Engineered multipolar SHG in planar metallic nanoparticle arrays is achievable.
- Aperiodic spiral arrays offer enhanced SHG intensity.
- Potential for developing novel nanophotonic optical elements like nonlinear sensors and frequency converters.
