Towards nonlinear plasmonic devices based on metallic nanorods.

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Nonlinear optical properties of materials are crucial for advanced photonic applications.
• Gold nanorod arrays exhibit tunable plasmonic resonances sensitive to their environment.
• Nonlinear polymers offer dynamic control over optical characteristics.

Purpose of the Study:

• To investigate the nonlinear optical properties of gold nanorod arrays hybridized with poly-3BCMU.
• To explore the potential of this hybrid system for active photonic component design.
• To understand the mechanisms controlling optical extinction in the nanostructured system.

Main Methods:

• Utilized two-colour continuously working (CW) pump-probe spectroscopy.
• Studied the hybridization of gold nanorod arrays with the nonlinear polymer poly-3BCMU.
• Analyzed the sensitivity of plasmonic resonances to pump-induced refractive index changes.

Main Results:

• Demonstrated control over the optical extinction of gold nanorod arrays via polymer refractive index modulation.
• Observed both reversible and non-reversible optical responses.
• Attributed the observed behavior to the third-order nonlinear response and post-photopolymerization reactions.

Conclusions:

• The hybrid gold nanorod-polymer system exhibits tunable nonlinear optical properties.
• This system holds promise for the development of active photonic components.
• Understanding the interplay between nonlinear optical response and photopolymerization is key for device design.