Journal
OPTICS EXPRESS
Volume 20, Issue 10, Pages 11466-11477Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.011466
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- Yokohama National University
- Yokohama Academic Foundation
- Research Foundation for Opt-Science and Technology
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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) x 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. (C) 2012 Optical Society of America
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