Lunedì 4 settembre 2023 - Ore 11:30 - Aula 21
Prof. Mana Toma - Department of Electrical and Electronic Engineering, Tokyo Institute of Technology (Yokohama, Japan)
  Seminario  

Over the last years, the development of portable plasmonic biosensors which can be used ‘on-site’ has been an important subject toward their practical applications. The utilization of metal nanostructured arrays which are also referred to as plasmonic metasurfaces provides a way to design the key characteristics of plasmonic biosensors. The coloration from plasmonic metasurfaces is one of their attractive optical properties for biosensor application, as colors are easily detected by eye observation or photographs. The feasibility of sensitive label-free colorimetric biosensing using plasmonic metasurface will open up a way to develop highly sensitive and versatile smartphone-based plasmonic biosensors. In our group, we investigate the unique surface colors of metal nanodome arrays for a colorimetric biosensor application. The metal nanodome arrays consist of polystyrene nano-bead monolayer coated with metal thin films. Although it has a simple structure, it has interesting optical properties and develops various colors depending on the polystyrene particle size, metal species, etc. In this presentation, I will introduce the optical properties of metal nanodome arrays and their performance characteristics in colorimetric biosensors.