Gold nanorod reshaping spectroscopy
We study single gold nanorod reshaping by femtosecond pulsed laser irradiation and understand the dynamics and surface diffusion at the tip. This project will help develop stable linear and nonlinear radiative markers for biomedical applications.
Nanoplasmonics is a new class of research field in optics that uses electron cloud oscillations in metallic nanostructures to allow strong interactions at optical frequencies. Plasmonic circuits are continually developed to bridge photonics and electronics, overcoming their inherent limitations in speed and miniaturisation. However, the stability of the plasmonic structures is under question due to the increased surface atomic diffusions at the nanoscale.
We study the fundamental material properties of these plasmonic elements under operation. In particular, we'll investigate the surface diffusion induced instability of the structures together with the surface plasmon propagation. This involves three-dimensional simulations into shape evolution with given laser power.
This project is of importance to:
- nanoplasmonic circuitry
- high density optical storage based on plasmonic nanoparticles
- linear and nonlinear biolabelling of plasmonic nanorods
- optical nanoantennas.
Our cutting-edge electron beam lithography platform (Raith II) fabricates the nanoplasmonic elements. Our ultrafast lasers (Spectra Physics, Broad band Ti:Sapphire Tsunami) excite surface plasmons in the structure.
Project leader: Associate Professor James Chon