3D Multi-Branched SnO₂ Semiconductor Nanostructures as Optical Waveguides

• Main Authors: Francesco Rossella, Vittorio Bellani, Matteo Tommasini, Ugo Gianazza, Elisabetta Comini, Caterina Soldano
• Format: Article
• Language: English
• Published: MDPI AG 2019-09-01
• Series: Materials
• Subjects: nano-optics; light scattering; nanowires; 3d multi-branched nanostructures; waveguiding effect in nanostructures; tin oxide nanostructure; sno₂
• Online Access: https://www.mdpi.com/1996-1944/12/19/3148

Nanostructures with complex geometry have gathered interest recently due to some unusual and exotic properties associated with both their shape and material. 3D multi-branched SnO₂ one-dimensional nanostructrures, characterized by a “node”—i.e., the location where two or more branches originate, are the ideal platform to distribute signals of different natures. In this work, we study how this particular geometrical configuration affects light propagation when a light source (i.e., laser) is focused onto it. Combining scanning electron microscopy (SEM) and optical analysis along with Raman and Rayleigh scattering upon illumination, we were able to understand, in more detail, the mechanism behind the light-coupling occurring at the node. Our experimental findings show that multi-branched semiconductor 1D structures have great potential as optically active nanostructures with waveguiding properties, thus paving the way for their application as novel building blocks for optical communication networks.