High-aspect ratio plasmonic nanostructures

We study plasmonic modes in high aspect ratio nanostructures in the visible wavelength region and explore their performance for sensing applications. Ordered and well-defined plasmonic structures with various cross-sectional profiles and heights can be obtained using a top-down fabrication process that has been developed in our lab. Such plasmonic nanostructures allows improvement of the biosensing performance or enables fabrication of quasi-3D metamaterials. For example gold nanorods and split-ring resonators with heights of up to 1000 nm and feature sizes down to 20 nm were obtained.