title: Programmable and reversible plasmon mode engineering.
abstract: Plasmonic nanostructures with enhanced localized optical fields as well as narrow linewidths have driven advances in numerous applications. However, the active engineering of ultranarrow resonances across the visible regime-and within a single system-has not yet been demonstrated. This paper describes how aluminum nanoparticle arrays embedded in an elastomeric slab may exhibit high-quality resonances with linewidths as narrow as 3 nm at wavelengths not accessible by conventional plasmonic materials. We exploited stretching to improve and tune simultaneously the optical response of as-fabricated nanoparticle arrays by shifting the diffraction mode relative to single-particle dipolar or quadrupolar resonances. This dynamic modulation of particle-particle spacing enabled either dipolar or quadrupolar lattice modes to be selectively accessed and individually optimized. Programmable plasmon modes offer a robust way to achieve real-time tunable materials for plasmon-enhanced molecular sensing and plasmonic nanolasers and opens new possibilities for integrating with flexible electronics.
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.
authors.forename: Ankun
authors.initials: A
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Hryn
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208.
authors.forename: Marc R
authors.initials: MR
authors.lastname: Bourgeois
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.
authors.forename: Won-Kyu
authors.initials: WK
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208.
authors.forename: Jingtian
authors.initials: J
authors.lastname: Hu
authors.affiliation: Department of Chemistry, Northwestern University, Evanston, IL 60208.
authors.forename: George C
authors.initials: GC
authors.lastname: Schatz
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208; todom@northwestern.edu.|Department of Chemistry, Northwestern University, Evanston, IL 60208.
authors.forename: Teri W
authors.identifier: 0000-0002-8490-292X
authors.initials: TW
authors.lastname: Odom
keywords: flexible substrates; lattice plasmons; mode engineering; nanoparticles; plasmonics