Simple Method for Large-Scale Fabrication of Plasmonic Structures

TL;DR

This paper introduces a simple, scalable laser writing technique to fabricate nanoparticle-based plasmonic structures without lithography, enabling tunable optical properties for various applications.

Contribution

A novel single-step, lithography-free laser writing method for large-scale fabrication of plasmonic nanostructures with tunable size and spacing.

Findings

Demonstrated control over nanoparticle size and spacing.

Achieved effective resonant light absorption and scattering.

Enabled surface-enhanced Raman scattering on fabricated structures.

Abstract

A novel method for single-step, lithography-free, and large-scale laser writing of nanoparticle-based plasmonic structures has been developed. Changing energy of femtosecond laser pulses and thickness of irradiated gold film it is possible to vary diameter of the gold nanoparticles, while the distance between them can be varied by laser scanning parameters. This method has an advantage over the most previously demonstrated methods in its simplicity and versatility, while the quality of the structures is good enough for many applications. In particular, resonant light absorbtion/scattering and surface-enhanced Raman scattering have been demonstrated on the fabricated nanostructures.