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1 May 2012 Imaging of waveguiding and scattering interferences in individual GaAs nanowires via second-harmonic generation
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Abstract
We use the nonlinear optical property of GaAs to directly visualize the path of the near infrared incident laser light coupled into individual nanowires. We fully illuminate with near infrared pulse laser untapered and tapered GaAs nanowires grown via the Au-assisted vapor-liquid-solid mechanism. We record second-harmonic generation (SHG) signals in the visible spectrum. In some nanowires, an interference pattern is observed and investigated in terms of distances between the maxima of the SHG signal taking into account the effective refractive index in such sub wavelength structures with radius below 90 nm. We propose a model to explain the periodicity of the maxima in the SHG interference pattern. The theoretical model includes the waveguiding and the Mie scattering theories for obtaining the 2π periodicity fitting well the experiments. Moreover, we also measure interferences in tapererd nanowires with a radius down to 76 nm. The possible effect of the gold in non radiative recombination and the presence of the gold particle at the tip of some nanowires are also discussed.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rachel Grange, Gerald Brönstrup, Anton Sergeyev, Jessica Richter, Thomas Pertsch, Andreas Tünnermann, Silke Christiansen, Christian Leiterer, Wolfgang Fritzsche, Christoph Gutsche, Andrey Lysov, Werner Prost, and Franz-Josef Tegude "Imaging of waveguiding and scattering interferences in individual GaAs nanowires via second-harmonic generation", Proc. SPIE 8424, Nanophotonics IV, 84241J (1 May 2012); https://doi.org/10.1117/12.921758
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