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Multiresonant High-Q Plasmonic Metasurfaces

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)6429-6434
Number of pages6
JournalNano Letters
Volume19
Issue number9
DOIs
Publication statusPublished - 11 Sep 2019
Publication typeA1 Journal article-refereed

Abstract

Resonant metasurfaces are devices composed of nanostructured subwavelength scatterers that generate narrow optical resonances, enabling applications in filtering, nonlinear optics, and molecular fingerprinting. It is highly desirable for these applications to incorporate such devices with multiple high-quality-factor resonances; however, it can be challenging to obtain more than a pair of narrow resonances in a single plasmonic surface. Here, we demonstrate a multiresonant metasurface that operates by extending the functionality of surface lattice resonances, which are the collective responses of arrays of metallic nanoparticles. This device features a series of resonances with high-quality factors (Q ∼ 40), an order of magnitude larger than what is typically achievable with plasmonic nanoparticles, as well as a narrow free spectral range. This design methodology can be used to better tailor the transmission spectrum of resonant metasurfaces and represents an important step toward the miniaturization of optical devices.

Keywords

  • gold nanoparticles, nanophotonics, Plasmonics, resonant metasurface, surface lattice resonance

Publication forum classification

Field of science, Statistics Finland