Influence of the Gap Distance and Morphology on the Plasmon Modes of Gold Nanocube Dimers

Abstract Plasmonic metallic nanostructures have gained significant attention due to their ability to confine light at the nanoscale. In this study, the influence of minor morphological variations by truncation of different planes on the plasmonic response of colloidal Au nanocube dimers and their separation (nanogap) is investigated by electron energy loss spectroscopy (EELS). To understand the impact of these factors, two different cube models for numerical simulations have been considered: one mimicking the truncation by {111} facets, and another mimicking their truncation by {110} ones. The experimental results, supported by numerical simulations, reveal two origins for the sensitivity of EELS spectra to nanostructure truncation: the plasmonic modes' dependence on facet geometry at the nanogap between Au nanocubes and the beam position's precision, which governs excitation efficiency. Notably, the nanogap distances between Au nanocubes are accurately measured using edge spread functions from High‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) images, demonstrating that STEM mode provides superior precision compared to the more commonly used TEM modes. These findings contribute to a deeper understanding of the relationship between structural features and plasmonic behavior in Au nanocube dimers, crucial for the designing next‐generation plasmonic devices, including quantum plasmonic systems and SERS‐based sensors.

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Publication Details

Journal
Advanced Optical Materials
Published
2025-04-17
DOI
https://doi.org/10.1002/adom.202500042
Citations
1
Primary Topic
Gold and Silver Nanoparticles Synthesis and Applications
Type
article
Field-Weighted Citation Impact
0.43

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Influence of the Gap Distance and Morphology on the Plasmon Modes of Gold Nanocube Dimers

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Advanced Optical Materials
Gold and Silver Nanoparticles Synthesis and Applications
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Influence of the Gap Distance and Morphology on the Plasmon Modes of Gold Nanocube Dimers

Judith Langer, Marc Coronado‐Puchau, Ramón Manzorro, Félix Zamora, David Rodríguez‐San‐Miguel, Beatriz H. Juárez, Antonio I. Fernández‐Domínguez, Luis M. Liz‐Marzán, Susana Trasobares, Ana Sánchez‐Iglesias, Jesús Barrio, Consuelo Moreno
article en
1 citations

Abstract

Abstract Plasmonic metallic nanostructures have gained significant attention due to their ability to confine light at the nanoscale. In this study, the influence of minor morphological variations by truncation of different planes on the plasmonic response of colloidal Au nanocube dimers and their separation (nanogap) is investigated by electron energy loss spectroscopy (EELS). To understand the impact of these factors, two different cube models for numerical simulations have been considered: one mimicking the truncation by {111} facets, and another mimicking their truncation by {110} ones. The experimental results, supported by numerical simulations, reveal two origins for the sensitivity of EELS spectra to nanostructure truncation: the plasmonic modes' dependence on facet geometry at the nanogap between Au nanocubes and the beam position's precision, which governs excitation efficiency. Notably, the nanogap distances between Au nanocubes are accurately measured using edge spread functions from High‐angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) images, demonstrating that STEM mode provides superior precision compared to the more commonly used TEM modes. These findings contribute to a deeper understanding of the relationship between structural features and plasmonic behavior in Au nanocube dimers, crucial for the designing next‐generation plasmonic devices, including quantum plasmonic systems and SERS‐based sensors.

Advanced Optical MaterialsVol. 13(15)
Ikerbasque (ES), Consejo Superior de Investigaciones Científicas (ES), Universitat de València (ES), Parc Científic de la Universitat de València (ES), Universidad de Cádiz (ES), CIC biomaGUNE (ES), Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (ES), Instituto de Ciencia de Materiales de Madrid (ES), Material Physics Center (ES), Hospital Universitario Puerto Real (ES), Imperial College London (GB), Universidade de Vigo (ES), Universidad Autónoma de Madrid (ES)
Comunidad de Madrid, Ministerio de Ciencia, Innovación y Universidades, European Commission, European Regional Development Fund, Agencia Estatal de Investigación
Openalex Percentile: Top 43%
Gold and Silver Nanoparticles Synthesis and Applications
0.43
DOIOpen Access PDFOpenAlex
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