Single-Beam Inscription of Plasmon-Induced Surface Gratings

Authors

Denis AB Therien, The University of Western Ontario
Nina M. Culum, The University of Western Ontario
Danielle M. McRae, The University of Western Ontario
Leila Mazaheri, The University of Western OntarioFollow
Francois Lagugne-Labarthet, University of Western OntarioFollow

Document Type

Article

Publication Date

Winter 1-8-2021

Journal

Optical Materials

Volume

112

First Page

110775

Last Page

110775

URL with Digital Object Identifier

https://doi.org/10.1016/j.optmat.2020.110775

Abstract

The formation of gratings on gold nanoprisms arrays by plasmon-mediated reduction of a diazonium salt is investigated. Nanosphere lithography (NSL) is used to produce large surfaces of gold nanoprisms that are effective at reducing diazonium salts by producing hot electrons through excitation of localized surface plasmon resonances (LSPRs). Using single beam irradiation, we report here on the formation of periodic structures formed from the diazonium salts and that follow the NSL structures. On plasmonically active nanoprism substrates, the electric field enhancement promotes chemical reduction and hence modifies the grafting direction and grating properties of the ripples. The nanoprisms act as a plasmon guide which widens the pitch of the self-organized gratings and can even alter it from straight lines into a crisscross pattern.

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