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Opt Express. 2012 May 7;20(10):11466-77. doi: 10.1364/OE.20.011466.

Surface plasmon resonances in periodic and random patterns of gold nano-disks for broadband light harvesting.

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  • 1Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, Hodogaya-ku, Yokohama, Japan.


We analyze the localized surface plasmon resonance spectra of periodic square lattice arrays of gold nano-disks, and we describe numerically and experimentally the effect of disorder on resonance width, spectrum, and EM field enhancement in increasingly randomized patterns. The periodic structure shows a narrower and stronger extinction peak, conversely we observe an increase of up to (1-2)×10(2) times enhancement as the disorder is gradually introduced. This allows for simpler, lower resolution fabrication, cost-effective in light harvesting for solar cell and sensing applications. We show that dipole-dipole interactions contribute to diffract light parallel to the surface as a mean of long-range coupling between the nano-disks.

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