Fabrication and tuning of nanoscale metallic ring and split-ring arrays

A. K. Sheridan*, A. W. Clark, A. Glidle, J. M. Cooper, D. R. S. Cumming

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Metallic structures with dimensions smaller than the wavelength of light demonstrate optical properties which depend strongly on the nanoparticle size, shape, and interparticle spacing. The optical properties are caused by the excitation of localized surface plasmon resonances that lead to strong enhancement and confinement of the optical field and can be exploited for many applications including surface-enhanced Raman spectroscopy, near-field scanning optical microscopy, and negative refractive index materials. In order to fully exploit the properties of these structures, both a highly reproducible and flexible fabrication technique and an in-depth understanding of the optical properties are needed. In this article, the authors demonstrate the fabrication of arrays of gold rings and split rings on glass using electron beam lithography. Electron beam lithography allows not only precise control of the size, shape, and spacing of the arrays but also the scope to design novel shapes at will. We characterize these arrays using polarization dependent spectroscopy. The structures can support multiple plasmon resonances, demonstrating that excellent uniformity across the array is achieved. These resonances are further characterized using a finite difference time domain method to model the electric field distribution around the ring structures. (C) 2007 American Vacuum Society.

Original languageEnglish
Pages (from-to)2628-2631
Number of pages4
JournalJournal of Vacuum Science and Technology B
Volume25
Issue number6
DOIs
Publication statusPublished - Nov 2007
Event51st International Conference on Electron, Ion, and Photon Beam Technology and Nanofabrication - Denver, Colombia
Duration: 29 May 20071 Jun 2007

Keywords

  • ENHANCED RAMAN-SCATTERING
  • SURFACE-PLASMON RESONANCE
  • LITHOGRAPHY
  • NANOPARTICLES
  • METAMATERIALS

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