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Strain‐Induced Modulation of Localized Surface Plasmon Resonance in Ultrathin Hexagonal Gold Nanoplates
Author(s) -
Park GyeongSu,
Min Kyung Suk,
Kwon Hyuksang,
Yoon Sangwoon,
Park Sangwon,
Kwon JiHwan,
Lee Sangmin,
Jo Jaeyeon,
Kim Miyoung,
Kim Seong Keun
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100653
Subject(s) - materials science , surface plasmon resonance , nanoscopic scale , plasmon , localized surface plasmon , nanotechnology , transmission electron microscopy , anisotropy , colloidal gold , excitation , optics , optoelectronics , nanoparticle , physics , electrical engineering , engineering
Anisotropic gold nanoplates (NPLs) have raised the interesting possibility that their reduced geometrical symmetry allows fine tuning of their optical properties associated with the excitation of localized surface plasmon resonances (LSPRs). Recent developments have greatly improved LSPR tunability by utilizing the spatial distribution of LSPR modes. However, the nanoscale interplay between defect‐induced mechanical strain and the spatial variation of LSPR modes remains poorly understood. In this work, the combination of high spatial‐ and spectral‐resolution mapping of LSPR modes and nanoscale strain mapping using aberration‐corrected transmission electron microscopy are applied to investigate the nanoscale distribution of LSPR modes in an ultrathin single hexagonal gold NPL and the effect of defect‐induced strains on its LSPR properties. The electron energy‐loss spectral maps reveal four distinct LSPR components and intensity distributions of all LSPR modes in a hexagonal gold NPL. Furthermore, the strain maps provide experimental evidence that the tensile strain field induced by a Z‐shaped faulted dipole is responsible for the asymmetric distribution of LSPR intensity in a hexagonal gold NPL.