Details

Autor(en) / Beteiligte

• Salmon, Andrew R
• Kleemann, Marie-Elena
• Huang, Junyang
• Deacon, William M
• Carnegie, Cloudy
• Kamp, Marlous
• de Nijs, Bart
• Demetriadou, Angela
• Baumberg, Jeremy J

Titel

Light-Induced Coalescence of Plasmonic Dimers and Clusters

Ist Teil von

• ACS nano, 2020-04, Vol.14 (4), p.4982-4987

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.