Abstract
The plasmon resonance of periodic and random arrays of Au-nanodiscs and nano-squares was investigated experimentally and numerically. By randomization, plasmon resonance spectra become broadened, however, the electro-magnetic field enhancement is augmented by a factor of 10–10\(^2\) times at some specific wavelength as shown by the finite-element time-domain calculations. The spatial localization takes place at a fewer hot-spots. The randomized structures are promising for the applications in opto-electronics, sensing and light harvesting.
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Acknowledgments
Authors thank Prof. T. Baba (Yokohama National University) for discussions and facility supports. Authors also thank Prof. Jacob Khurgin (Johns Hopkins University) and Prof. H. Fujiwara (Hokkido University) for their fruitful discussions. This work was financially supported by the Amada Foundation, the Research Foundation for Opt-Science and Technology, and The Ministry of Education, Culture, Sports, Science and Technology(MEXT), Japan. SJ is thankful for support by ARC Discovery DP130101205 grant.
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Nishijima, Y., Rosa, L. & Juodkazis, S. Long-range interaction of localized surface plasmons in periodic and random patterns of Au nanoparticles. Appl. Phys. A 115, 409–414 (2014). https://doi.org/10.1007/s00339-013-8057-9
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DOI: https://doi.org/10.1007/s00339-013-8057-9