DNA-origami arrays for metamaterials and plasmonic applications


Main funder


Funds granted by main funder (€)

20 000,00


Funding program

Researcher mobility Funding, AoF (Academy of Finland)


Project timetable

Project start date: 01/01/2020

Project end date: 31/12/2021


Summary

Owing to plasmonic resonances, metallic nanostructures have unique optical properties. These plasmonic nanostructures are widely utilized for enhanced fluorescence and surface enhanced Raman spectroscopy, and more recently also in quantum photonics and as components of novel metamaterials, which have proven to possess novel electromagnetic properties enabling breakthrough applications. In health and biosciences, plasmonics has been widely used for sensing and diagnostics. Especially chiral nanostructures and metamaterials have been an emerging hot topic due to their potential for novel enantiomer sensitive detection.

Since the plasmonic resonances are dramatically affected by the material, size and shape of the metal nanostructure, above purposes demand precise control of nanostructure morphology. Despite truly impressive progress in the field of plasmonics enabled by advanced nanofabrication techniques, creating complex and sufficiently small metallic shapes for metamaterials remains challenging. Thus, development of methods allowing cost effective large-scale fabrication of metal nanostructures of complex shapes with nanoscale accuracy, is of great importance.

DNA-origami technology provides a novel way to produce molecular units with nanometer precision, which can easily be utilized also to position individual components, like fluorophores or metal nanoparticles, at precise positions. Recently, the authors of this proposal have demonstrated a novel method to transfer the full shape of the origami into metallic nanoshapes easily covering large surfaces thanks to parallel fabrication. Whereas the potential of DNA-origami for optical active elements has been demonstrated in a variety of cases, the utilization of these individual units as meta-atoms, i.e. building parts of metamaterials, and arranging them in a 2D-array to realize a full metasurface, is still under development. This represents the main focus of the proposed project.

We are utilizing self-assembled surface prepatterns and guide the DNA-origami to pre-defined positions and turned into metallic structures. In addition, hybrid origami constructions exhibiting a certain arrangement of metal structures are utilized, because in that case a 2D crystalline arrangement of the underlying origami geometry can be utilized directly to provide the spacer and order. These methods will provide parallel and cheap fabrication routes for a variety of metasurfaces covering large surface areas.


Principal Investigator


Primary responsible unit


Last updated on 2020-24-03 at 11:59