Effect of Ag Nanocube Optomechanical Modes on Plasmonic Surface Lattice Resonances

Mindaugas Juodėnas*, Domantas Peckus, Tomas Tamulevičius, Yusuke Yamauchi, Sigitas Tamulevičius, Joel Henzie*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Noble metal nanoparticles patterned in ordered arrays can interact and generate hybrid plasmonic-photonic resonances called surface lattice resonances (SLRs). Dispersion curves help explain how the Bragg coupling conditions and radiation patterns create dipolar and quadrupolar SLRs, but they assume that the nanoparticles are static structures, which is inaccurate at ultrafast time scales. In this article, we examine how local surface plasmon resonances (LSPRs) supported by cubic Ag nanocrystals are modulated by ultrafast photophysical processes that generate optomechanical modes. We use transient absorbance spectroscopy measurements to demonstrate how the LSPRs of the nanoparticles modulate the SLR of the array over time. Two primary mechanical breathing modes of Ag nanocubes were identified in the data and input into electromagnetic models to examine how fluctuations in shape affect the dispersion diagram. Our observations demonstrate the impact of optomechanical processes on the photonic length scale, which should be considered in the design of SLR-based devices.

Original languageEnglish
JournalACS Photonics
Volume7
Issue number11
Pages (from-to)3130–3140
ISSN2330-4022
DOIs
Publication statusPublished - 18. Nov 2020
Externally publishedYes

Keywords

  • lattice plasmons
  • optomechanics
  • photoacoustics
  • plasmonics
  • self-assembly
  • surface lattice resonances

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