Nonlinear plasmonic cloaks to realize giant all-optical scattering switching

Area of Science:

• Nanophotonics and Plasmonics
• Nonlinear Optics
• Metamaterials

Background:

• Fano resonance offers unique optical properties but has limitations in control and application.
• All-optical switching requires efficient control of light-matter interactions at the nanoscale.
• Plasmonic nanoparticles are key components for manipulating light at the nanoscale.

Purpose of the Study:

• To combine Fano resonant coupling with cloaking and plasmonic resonances in a single nonlinear nanoparticle.
• To realize giant all-optical scattering nanoswitches controlled by moderate pumping intensities.
• To demonstrate abrupt switching between cloaked and resonant states.

Main Methods:

• Design and theoretical analysis of a core-shell nonlinear plasmonic nanoparticle.
• Investigation of Fano resonant coupling integrated with cloaking principles.
• Simulation of optical scattering properties under varying pumping intensities.

Main Results:

• Achieved giant all-optical scattering nanoswitches with up to a 40 dB cross-sectional difference.
• Demonstrated abrupt switching from a completely cloaked state to a strongly resonant state.
• Showcased self-tunable optical cloaks and resonant scatterers.

Conclusions:

• The proposed nonlinear plasmonic nanoparticle design enables efficient all-optical switching.
• These devices can function as effective all-optical switches and nanomemories.
• Moderate pumping intensities are sufficient for significant control over the scattering properties.