Tunable optical antennas based on metallic nanoshells with nanoknobs

Area of Science:

• Plasmonics and Nanophotonics
• Materials Science and Engineering

Background:

• Complex plasmonic nanostructures offer unique optical properties.
• Controlling light-matter interactions at the nanoscale is crucial for advanced optical devices.

Purpose of the Study:

• To investigate the optical properties of a novel complex plasmonic nanostructure.
• To explore the potential of this structure for light localization and enhancement.
• To demonstrate a new method for precise nanoparticle manipulation.

Main Methods:

• Electromagnetic modeling was employed to simulate the optical response.
• Near-field optical microscopy was used for experimental validation.
• Electron beam manipulation was utilized for precise nanoparticle placement.

Main Results:

• The plasmon resonance wavelength is tunable via nanoshell geometry and material.
• The nanoknob significantly localizes and enhances the electromagnetic field.
• A novel method for precise nanoparticle manipulation under electron beam was successfully demonstrated.

Conclusions:

• The studied complex plasmonic nanostructure exhibits tunable optical properties.
• The nanoknob enhances localized electromagnetic fields, beneficial for sensing and nanophotonics.
• The demonstrated nanoparticle manipulation technique is promising for fabricating complex nanostructures.