Plasmonic Janus Microspheres Created from Pickering Emulsion Drops.

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Plasmonic properties are crucial for advanced optical applications.
• Fabricating nanostructures on spherical surfaces presents significant challenges for conventional methods.

Purpose of the Study:

• To develop a novel method for creating plasmonic microgranules with tunable optical properties.
• To design well-defined metal nanostructures on microsphere surfaces for enhanced plasmonic effects.

Main Methods:

• Utilized photocurable emulsion drops with silica particles at the interface to form periodic nanostructures.
• Employed directional deposition of aluminum or gold onto silica-templated microspheres.
• Controlled nanostructure geometry and plasmonic color by adjusting aging time, metal thickness, and silica particle size.

Main Results:

• Successfully created plasmonic Janus microspheres with hexagonal arrays of dimples and curved disks.
• Achieved tunable plasmonic colors by precisely controlling nanostructure parameters.
• Demonstrated a new granular format for plasmonic materials.

Conclusions:

• The photocurable emulsion method offers a viable approach for nanofabrication on spherical substrates.
• Plasmonic microgranules exhibit potential for applications in active color pixels, optical barcodes, and microsensors.
• This work expands the possibilities for designing and utilizing plasmonic nanomaterials.