Dressing Plasmons in Particle-in-Cavity Architectures

Fumin Huang, Dean Wilding, Jonathon D. Speed, Andrea E. Russell, Philip N. Bartlett, Jeremy J. Baumberg

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)


Placing metallic nanoparticles inside cavities, rather than in dimers, greatly improves their plasmonic response. Such particle-in-cavity (PIC) hybrid architectures are shown to produce extremely strong field enhancement at the particle cavity junctions, arising from the cascaded focusing of large optical cross sections into small gaps. These simply constructed PIC structures produce the strongest field enhancement for coupled nanoparticles, up to 90% stronger than for a dimer. The coupling is found to follow a universal power law with particle surface separation, both for field enhancements and resonant wavelength shifts. Significantly enhanced Raman signals are experimentally observed for molecules adsorbed in such PIC structures, in quantitive agreement with theoretical calculations. PIC architectures may have important implications in many applications, such as reliable single molecule sensing and light harvesting in plasmonic photovoltaic devices.

Original languageEnglish
Pages (from-to)1221-1226
Number of pages6
JournalNano Letters
Issue number3
Publication statusPublished - Mar 2011

Bibliographical note

This work is supported by EPSRC Grants EP/G060649/1 and EP/F059396/1


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