Abstract
In this paper we investigate for the first time the near-field optical behavior of two-dimensional Fibonacci plasmonic lattices fabricated by electron-beam lithography on transparent quartz substrates. In particular, by performing near-field optical microscopy measurements and three dimensional Finite Difference Time Domain simulations we demonstrate that near-field coupling of nanoparticle dimers in Fibonacci arrays results in a quasi-periodic lattice of localized nanoparticle plasmons. The possibility to accurately predict the spatial distribution of enhanced localized plasmon modes in quasi-periodic Fibonacci arrays can have a significant impact for the design and fabrication of novel nano-plasmonics devices.
Highlights
The present need to control and manipulate deep sub-wavelength optical fields at the nanoscale has stimulated a fundamental interest in localized plasmon excitations and electromagnetic interactions in metal nanoparticle arrays [1,2,3,4,5,6]
In this paper we investigate for the first time the spatial distribution of localized plasmon modes in two-dimensional Fibonacci arrays of gold nanoparticles fabricated by electron-beam lithography on a quartz substrate
In this paper we have experimentally investigated the field enhancement and the spatial distribution of localized plasmon modes in periodic and quasi-periodic Fibonacci arrays of gold nanoparticles
Summary
The present need to control and manipulate deep sub-wavelength optical fields at the nanoscale has stimulated a fundamental interest in localized plasmon excitations and electromagnetic interactions in metal nanoparticle arrays [1,2,3,4,5,6]. Recent experiments have investigated the dynamic transport properties of porous silicon Fibonacci multilayers and strongly suppressed group velocity has been observed at the edge modes of the fundamental Fibonacci bandgap [25] These states show sizable field enhancement and characteristic self-similar patterns [26], which are typical of critically localized modes. By performing near-field optical measurements and three dimensional Finite Difference Time Domain (FDTD) simulations we demonstrate that nearfield coupling of nanoparticle dimers in Fibonacci arrays results in a predictable quasiperiodic lattice of localized plasmon modes with enhanced field intensity. These results suggest alternative schemes to design and improve the sensitivity of plasmon sensor arrays and Surface Enhanced Raman Scattering (SERS) substrates
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