Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 86: Plasmonics and Nanooptics VI
O 86.8: Vortrag
Freitag, 15. März 2013, 12:15–12:30, H36
Effect of size and shape of randomly distributed ZnO nanoneedle arrays on the localization of light fields — •Martin Silies1, Manfred Mascheck1, Slawa Schmidt1, Janos Sartor2, David Leipold3, Takashi Yatsui4, Kokoro Kitamura4, Motoicho Ohtsu4, Heinz Kalt2, Erich Runge3, and Christoph Lienau1 — 1Carl von Ossietzky Universität, Oldenburg, Germany — 2Karlsruhe Institute of Technology, Germany — 3Technische Universität Ilmenau, Germany — 4University of Tokyo, Japan
We report on measurements about the influence of size, shape and diameter of arbitrarily arranged ZnO nanostructures on the localization of light. We use coherent, ultra-broadband Second Harmonic (SH) microscopy to investigate the spatial localization of light in nm-sized ZnO needle arrays. Strong fluctuations of the SH intensity inside different ZnO needle geometries are observed [1].
Comparison of the SH intensity distributions with predictions based on one-parameter scaling theory indicate that SH fluctuations may be taken as a quantitative measure to classify the degree of localization [2]. Surprisingly, the strongest localization signatures are found for densely packed arrays of thin needles with diameters in the 30 nm range. Our results indicate that for sufficient high filling factors and small needle diameters near-field coupling between neighbouring needles governs the localization. These findings are supported by 3D-FDTD simulations using a Maxwell equation solver.
[1] Mascheck et al., Nat. Phot. 6, 293 (2012)
[2] Abrahams et al., Phys. Rev. Lett. 42, 673 (1979)