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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
Published on: January 3, 2016
Broadband unidirectional scattering by magneto-electric core-shell nanoparticles.
Wei Liu1, Andrey E Miroshnichenko, Dragomir N Neshev
1Nonlinear Physics Centre, Centre for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS), Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia.
ACS Nano
|May 2, 2012
Summary
Core-shell nanoparticles exhibit tunable resonances for diverse applications. Engineering electric and magnetic modes achieves unidirectional scattering, suppressing backward light for advanced nanodevices.
Area of Science:
- Nanophotonics and metamaterials
- Plasmonics and optical properties of nanoparticles
Background:
- Core-shell nanoparticles offer tunable optical resonances.
- These nanoparticles can support coupled electric and magnetic modes.
- Applications span medical diagnostics, biosensing, and nanolasers.
Purpose of the Study:
- Investigate core-shell nanoparticles with coinciding electric and artificial magnetic dipolar modes.
- Analyze the scattering properties arising from the interference of these modes.
- Explore methods to enhance unidirectional scattering and suppress backward scattering.
Main Methods:
- Theoretical study of core-shell nanoparticle optical properties.
- Numerical simulations of scattering characteristics.
- Analysis of resonance interference effects.
Main Results:
- Engineered core-shell nanoparticles exhibit spectrally coinciding electric and magnetic dipolar modes.
- Interference of these modes leads to azimuthally symmetric unidirectional scattering.
- Arranging nanoparticles in a chain preserves symmetry and suppresses backward scattering over a wide spectral range.
- Vanishing backward scattering is maintained even for random particle distributions.
Conclusions:
- Coinciding electric and magnetic resonances in core-shell nanoparticles enable controlled unidirectional scattering.
- This phenomenon is robust and applicable to various nanoparticle arrangements, including random distributions.
- Potential applications include advanced nanoantennas, efficient photovoltaic devices, and backward scattering-suppressed nanoscale lasers.
