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The quest for low loss high refractive index dielectric materials for uv photonic applications

Abstract: Nanostructured High Refractive Index (HRI) dielectric materials, when acting as nanoantennas or metasurfaces in the near-infrared (NIR) and visible (VIS) spectral ranges, can interact with light and show interesting scattering directionality properties. Also, HRI dielectric materials with low absorption in these spectral ranges show very low heat radiation when illuminated. Up to now, most of the studies of these kind of materials have been explored in the VIS-NIR. However, to the best of our knowledge, these properties have ot been extended to the ultraviolet (UV), where their application in fields like photocatalysis, biosensing, surface-enhanced spectroscopies or light guiding and trapping can be of extraordinary relevance. Here, we present a detailed numerical study of the directional scattering properties, near-field enhancement and heat generation of several materials that can be good candidates for those applications in the UV. These materials include aluminum phosphide, aluminum arsenide, aluminum nitride, diamond, cerium dioxide and titanium dioxide. In this study, we compare their performance when forming either isolated nanoparticles or dimers to build either nanoantennas or unit cells for more complex metasurfaces.

 Fuente: Applied Sciences, 2018, 8(11), 2065

 Editorial: MDPI

 Fecha de publicación: 25/10/2018

 Nº de páginas: 12

 Tipo de publicación: Artículo de Revista

 DOI: 10.3390/app8112065

 ISSN: 2076-3417

 Url de la publicación: https://doi.org/10.3390/app8112065