Quasi-Random Multimetallic Nanoparticle Arrays

Area of Science:

• Nanotechnology
• Materials Science
• Optics

Background:

• Developing methods for precise control over nanoparticle arrangement is crucial for advanced optical applications.
• Existing techniques often lack the flexibility to independently tailor multiple array parameters.

Purpose of the Study:

• To present a novel nanofabrication procedure for creating multiscale substrates with quasi-random microregions of nanoparticle arrays.
• To demonstrate the independent control over nanoparticle size, material, array geometry, and fill factor.

Main Methods:

• Combining large-area nanoparticle array fabrication with solvent-assisted wrinkle lithography.
• Utilizing lithography to mask and etch specific regions of prefabricated nanoparticles.
• Controlling fill factors of nanoparticle arrays.

Main Results:

• Successfully generated multiscale substrates with nanoparticle arrays of varying periodicities and metals.
• Demonstrated surface lattice resonances at low fill factors (20%) in multimetallic nanoparticle arrays.
• Achieved lasing action in nanoscale cavities using arrays with as few as 10% nanoparticles.

Conclusions:

• The developed nanofabrication approach offers high flexibility for tailoring nanoparticle array properties.
• Multimetallic nanoparticle substrates exhibit robust optical responses, enabling broadband light manipulation.
• The method facilitates the creation of devices for lasing action across visible and near-infrared wavelengths.