Light-Induced Coalescence of Plasmonic Dimers and Clusters
| Autor: | Angela Demetriadou, William M. Deacon, Marlous Kamp, Junyang Huang, Cloudy Carnegie, Andrew Salmon, Bart de Nijs, Jeremy J. Baumberg, Marie-Elena Kleemann |
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| Přispěvatelé: | Salmon, Andrew R [0000-0001-6267-5896], Demetriadou, Angela [0000-0001-7240-597X], Baumberg, Jeremy J [0000-0002-9606-9488], Apollo - University of Cambridge Repository |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics::Optics General Physics and Astronomy Sintering 02 engineering and technology Activation energy nanoparticle coalescence 010402 general chemistry 01 natural sciences plasmonics nanoparticle dimers General Materials Science optical spectroscopy Spectroscopy Plasmon Coalescence (physics) sintering General Engineering 021001 nanoscience & nanotechnology 0104 chemical sciences Characterization (materials science) Chemical physics Colloidal gold gold nanoparticles Light induced 0210 nano-technology |
| Zdroj: | ACS Nano. 14:4982-4987 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | The properties of nanoplasmonic structures depend strongly on their geometry, creating the need for high-precision control and characterization. Here, by exploiting the low activation energy of gold atoms on nanoparticle surfaces, we show how laser irradiation reshapes nanoparticle dimers. Time-course dark-field microspectroscopy allows this process to be studied in detail for individual nanostructures. Three regimes are identified: facet growth, formation of a conductive bridge between particles, and bridge growth. Electromagnetic simulations confirm the growth dynamics and allow measurement of bridge diameter, found to be highly reproducible and also self-limiting. Correlations in spectral resonances for the initial and final states give insight into the energy barriers for bridge growth. Dark-field microscopy shows that coalescence of multiple gaps in nanoparticle clusters can be digitally triggered, with each gap closing after discrete increases in irradiation power. Such control is important for light-induced nanowire formation or trimming of electronic and optoelectronic devices. |
| Databáze: | OpenAIRE |
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