3D Confocal Raman Tomography to Probe Field Enhancements inside Supercluster Metamaterials
| Autor: | Leonora Velleman, Vincenzo Giannini, Xiaofei Xiao, Emiliano Cortés, Alberto Lauri, Stefan A. Maier, Joshua B. Edel, Aliaksandra Rakovich |
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| Přispěvatelé: | European Commission, Office of Naval Research (US), European Research Council, Engineering and Physical Sciences Research Council (UK), Royal Society (UK), Commission of the European Communities, Engineering & Physical Science Research Council (EPSRC) |
| Rok vydání: | 2017 |
| Předmět: |
Field (physics)
Physics::Optics 02 engineering and technology Astrophysics::Cosmology and Extragalactic Astrophysics 010402 general chemistry 01 natural sciences symbols.namesake Optics Supercluster Electric field Electrical and Electronic Engineering Plasmon Physics Plasmonic nanoparticles business.industry SERS Metamaterial Self-assembly 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Collective plasmon modes symbols Nanoparticles 0210 nano-technology business Raman spectroscopy Excitation Biotechnology |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 8 pags., 5 figs. Spherical colloidal superclusters, composed from sub-100 nm plasmonic nanoparticles, have been proposed to possess collective plasmonic modes imbued with large field enhancements and tunable spectral response extending from the visible to infrared regions. Here, we report the experimental verification of collective near-IR plasmonic modes inside single superclusters, with dimensions ranging from 0.77 μm up to 2 μm. Raman reporters, coated onto the nanoparticle building blocks, were used as local probes of the electric field enhancement inside the metamaterial. By performing diffraction-limited 3D Raman tomography we were able to build up the electric field intensity distribution within the superclusters. We demonstrate that plasmonic responses of superclusters vary according to their size and excitation wavelength, in accordance with theoretical predictions of their tunable optical properties. The existence of three-dimensional internal collective modes in these superclusters enables the excitation of a large number of electromagnetic hot-spots, validating these self-assembled structures as promising candidates for molecular spectroscopy. A.L. thanks the WITec doctoral prize fellowship scheme for financial support. X.X. thanks the Lee Family doctoral prize fellowship scheme for financial support. L.V. would like to acknowledge the support of the H2020-MSCA fellowship. E.C. is supported by a Marie Curie fellowship of the European Commission. V.G. acknowledges ONR Global funding (N62909-15-1-N082). J.B.E. has been funded in part by ERC starting (NanoP) and consolidator (NanoPD) grants along with an EPSRC grant EP/L02098X/1. S.A.M. acknowledges the EPSRC Reactive Plasmonics Programme (EP/MO13812/ 1) and the Lee-Lucas Chair. A.R. would like to acknowledge the Royal Society for their support (UF150542). |
| Databáze: | OpenAIRE |
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