Adv Mater 2014 Apr 22;26(15):2353-8. Epub 2014 Jan 22.
Nanostructures, Istituto Italiano di Tecnologia, via Morego 30, Genova, 16163, Italy.
Plasmonic nanostar-dimers, decoupled from the substrate, have been fabricated by combining electron-beam lithography and reactive-ion etching techniques. The 3D architecture, the sharp tips of the nanostars and the sub-10 nm gap size promote the formation of giant electric-field in highly localized hot-spots. The single/few molecule detection capability of the 3D nanostar-dimers has been demonstrated by Surface-Enhanced Raman Scattering.