Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires

Author:

Floris FrancescoORCID,Fornasari Lucia,Bellani VittorioORCID,Marini Andrea,Banfi FrancescoORCID,Marabelli Franco,Beltram Fabio,Ercolani DanieleORCID,Battiato Sergio,Sorba Lucia,Rossella Francesco

Abstract

Random assemblies of vertically aligned core–shell GaAs–AlGaAs nanowires displayed an optical response dominated by strong oscillations of the reflected light as a function of the incident angle. In particular, angle-resolved specular reflectance measurements showed the occurrence of periodic modulations in the polarization-resolved spectra of reflected light for a surprisingly wide range of incident angles. Numerical simulations allowed for identifying the geometrical features of the core–shell nanowires leading to the observed oscillatory effects in terms of core and shell thickness as well as the tapering of the nanostructure. The present results indicate that randomly displaced ensembles of nanoscale heterostructures made of III–V semiconductors can operate as optical metamirrors, with potential for sensing applications.

Publisher

MDPI AG

Subject

General Materials Science

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