Dichroic switching of core-shell plasmonic nanoparticles on reflective surfaces

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Plasmonic metal nanostructures exhibit tunable light scattering and absorption based on their physical characteristics.
• Controlling these optical properties is key for developing advanced optical materials.

Purpose of the Study:

• To demonstrate unique dichroic effects and high-contrast color switching using plasmonic nanostructures.
• To explore the application of these phenomena in various technological fields.

Main Methods:

• Fabrication of core/shell plasmonic nanostructures with metal cores and dielectric shells.
• Spray coating these nanostructures onto reflective substrates to form dichroic films.
• Analysis of light interaction (scattering, absorption, reflection) with the nanostructures.

Main Results:

• Achieved unique dichroic effects and high-contrast color switching in the fabricated films.
• Demonstrated angle-dependent color changes due to resonant scattering, absorption, and specular reflection.
• Showcased the potential for designing multicolour patterns with flexibility.

Conclusions:

• Plasmonic core/shell nanostructures on reflective substrates enable efficient dichroic films with angle-dependent color switching.
• The developed technology offers a versatile platform for anticounterfeiting, mechanochromic sensing, color displays, and printing applications.
• The ease of large-scale production suggests significant practical utility.