Recent progress of gold nanostructures and their applications

Area of Science:

• Nanophotonics
• Materials Science
• Optics

Background:

• Noble metal nanostructures exhibit surface plasmons with spatial confinement and propagation loss.
• Plasmonic nanostructures, particularly gold (Au), are crucial in nanophotonics due to localized surface plasmon resonance (SPR).
• Au nanostructures offer strong optical extinction, near-field enhancement, and tunable SPR across the visible to near-infrared spectrum.

Purpose of the Study:

• To review the optical characteristics of various gold nanostructures.
• To investigate the influence of morphology and surrounding medium on SPR properties.
• To summarize applications of plasmonic gold nanostructures.

Main Methods:

• Finite-Difference Time-Domain (FDTD) simulations for modeling optical properties.
• Analysis of experimental data to validate computational models.
• Focus on diverse Au nanostructures: nanorods, nanocubes, nanobipyramids, and nanostars.

Main Results:

• Morphological parameters and the surrounding medium significantly tune the SPR properties of Au nanostructures.
• FDTD simulations accurately model the optical behavior of these nanostructures.
• Demonstrated tunability of SPR across the visible to near-infrared range.

Conclusions:

• Plasmonic gold nanostructures possess tunable SPR, making them highly versatile.
• These nanostructures are promising for advanced applications including high-sensitivity sensors, photothermal conversion, and photoelectric devices.
• Further development in plasmonic nanolasers is anticipated.