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Plasmonic mode conversion in individual tilted 3D nanostructures

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)5429-5440
Number of pages12
JournalNanoscale
Volume11
Issue number12
DOIs
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed

Abstract

We investigate mode conversion in 3D asymmetric nanocones using angle-dependent linear optical spectroscopy and second-harmonic generation microscopy supported by corresponding simulations. The results prove the efficient excitation of the plasmonic out-of-plane mode that enhances the electric near-field at the sharp tip. Furthermore, we introduce two advanced fabrication processes including either etch mask transfer by tilted etching into a metallic layer or tilted electron-beam lithography followed by tilted evaporation and lift-off. These processes enable the fabrication of tilted nanostructures which can be optimized for a given purpose. The combination of the optical properties and the introduced fabrication processes enables a new design of plasmonic nanostructures for ultra-compact sensors or photon sources.

Publication forum classification

Field of science, Statistics Finland