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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Dressing plasmons in particle-in-cavity architectures.

Fu Min Huang1, Dean Wilding, Jonathon D Speed

  • 1Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge, CB3 0HE, UK. fh281@cam.ac.uk

Nano Letters
|February 3, 2011
PubMed
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Metallic nanoparticles in cavities (PIC) show superior plasmonic response and field enhancement compared to dimers. This breakthrough offers enhanced Raman signals and potential for advanced sensing and light harvesting applications.

Area of Science:

  • Plasmonics
  • Nanophotonics
  • Surface-enhanced Raman spectroscopy (SERS)

Background:

  • Metallic nanoparticles exhibit plasmonic properties crucial for light-matter interactions.
  • Dimers of metallic nanoparticles are commonly used to enhance plasmonic fields.
  • Optimizing nanoparticle configurations is key to maximizing field enhancement for applications.

Purpose of the Study:

  • To investigate the plasmonic response of metallic nanoparticles placed inside cavities (PIC) compared to dimers.
  • To quantify the field enhancement and understand the underlying physics of PIC architectures.
  • To explore the application potential of PIC structures in sensing and energy harvesting.

Main Methods:

  • Fabrication of particle-in-cavity (PIC) hybrid architectures.

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  • Numerical simulations to model optical cross sections and field enhancement.
  • Experimental measurements of Raman signals for molecules adsorbed in PIC structures.
  • Analysis of coupling behavior as a function of particle-surface separation.

    • Main Results:

    • PIC architectures demonstrate significantly stronger field enhancement (up to 90%) than nanoparticle dimers.
    • Field enhancement and resonant wavelength shifts in PIC structures follow a universal power law with particle-surface separation.
    • Experimentally observed Raman signals from molecules in PIC structures are substantially enhanced and agree with theoretical predictions.
    • Cascaded focusing of optical cross sections into small gaps is identified as the mechanism for strong field enhancement.

    Conclusions:

    • Particle-in-cavity (PIC) architectures represent a highly effective design for enhancing plasmonic responses.
    • PIC structures offer superior field enhancement compared to traditional dimer configurations.
    • The findings suggest significant potential for PIC architectures in applications like single-molecule sensing and plasmonic photovoltaics.