journal article·2024-11-26Open access

Unconventional Optical Matter of Hybrid Metal–Dielectric Nanoparticles at Interfaces

Boris Louis, Chih-Hao Huang, Marc Melendez, Ana Sánchez-Iglesias, Jorge Olmos-Trigo, Sudipta Seth, Susana Rocha, Rafael Delgado-Buscalioni, Luis M. Liz-Marzán, Manuel I. Marqués, Hiroshi Masuhara, Johan Hofkens, Roger Bresolí-Obach

ACS Nano· Volume 18· Issue 47

Abstract

Optical matter, a transient arrangement formed by the interaction of light with micro/nanoscale objects, provides responsive and highly tunable materials that allow for controlling and manipulating light and/or matter. A combined experimental and theoretical exploration of optical matter is essential to advance our understanding of the phenomenon and potentially design applications. Most studies have focused on nanoparticles composed of a single material (either metallic or dielectric), representing two extreme regimes, one where the gradient force (dielectric) and one where the scattering force (metallic) dominates. To understand their role, it is important to investigate hybrid materials with different metallic-to-dielectric ratios. Here, we combine numerical calculations and experiments on hybrid metal-dielectric core-shell particles (200 nm gold spheres coated with silica shells with thicknesses ranging from 0 to 100 nm). We reveal how silica shell thickness critically influences the essential properties of optical binding, such as interparticle distance, reducing it below the anticipated optical binding length. Notably, for silica shells thicker than 50 nm, we observed a transition from a linear arrangement perpendicular to polarization to a hexagonal arrangement accompanied by a circular motion. Further, the dynamic swarming assembly changes from the conventional dumbbell-shaped to lobe-like morphologies. These phenomena, confirmed by both experimental observations and dynamic numerical calculations, demonstrate the complex dynamics of optical matter and underscore the potential for tuning its properties for applications.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Plasmonic and Surface Plasmon Research · Photonic Crystals and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory for Photochemistry and Spectroscopy, Division for Molecular Imaging and Photonics, Department of Chemistry, Katholieke Universiteit Leuven, Leuven 3000, Belgium

Department of Applied Chemistry and Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan

Departamento de Física de Materiales & Condensed Matter Physics Center (IFIMAC) & Nicolás Cabrera Institute, Universidad Autónoma de Madrid, C. Francisco Tomás y Valiente, 7, 28049 Madrid, Spain

CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastián, Spain

Center for Materials Physics (CSIC-UPV), 20018 Donostia-San Sebastián, Spain

Departamento de Física, Universidad de La Laguna, Apdo. 456., E-38200 San Cristóbal de La Laguna, Santa Cruz de Tenerife, Spain

Ikerbasque, Basque Foundation for Science, 48009 Bilbao, Spain

CINBIO, Universidade de Vigo, Departamento de Química Física, Campus Universitario As Lagoas, 36310 Marcosende Vigo, Spain

Max Planck Institute for Polymer Research, Mainz 55128, Germany

AppLightChem, Institut Químic de Sarrià, Universitat Ramon Llull, Barcelona 08017, Spain

Funding

HORIZON EUROPE European Innovation Council · Agencia Estatal de Investigaci?n · KU Leuven · Departement Economie, Wetenschap en Innovatie · Vlaamse regering · Fonds Wetenschappelijk Onderzoek · Ministry of Science and Technology, Taiwan · National Science and Technology Council · Center for Emergent Functional Matters Science, National Yang Ming Chiao Tung University · Ministerio de Ciencia e Innovaci?n · Ministry of Education, Taiwan

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