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Open AccessArticle

Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires

1
Tyndall National Institute, University College Cork, T12 R5CP Cork, Ireland
2
Dipartimento di Fisica, Università di Pavia and INFN, 27100 Pavia, Italy
3
Department of Physical and Chemical Sciences, University of L’Aquila, 67100 L’Aquila, Italy
4
Femto Nano Optics Group, Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière, F-69622 Villeurbanne, France
5
NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, 56127 Pisa, Italy
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(21), 3572; https://doi.org/10.3390/ma12213572
Received: 29 August 2019 / Revised: 21 October 2019 / Accepted: 28 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Semiconductor Nanowire Devices and Applications)
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. View Full-Text
Keywords: core–shell; nanowires; semiconductors; optical reflectance; numerical simulations core–shell; nanowires; semiconductors; optical reflectance; numerical simulations
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MDPI and ACS Style

Floris, F.; Fornasari, L.; Bellani, V.; Marini, A.; Banfi, F.; Marabelli, F.; Beltram, F.; Ercolani, D.; Battiato, S.; Sorba, L.; Rossella, F. Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires. Materials 2019, 12, 3572.

AMA Style

Floris F, Fornasari L, Bellani V, Marini A, Banfi F, Marabelli F, Beltram F, Ercolani D, Battiato S, Sorba L, Rossella F. Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires. Materials. 2019; 12(21):3572.

Chicago/Turabian Style

Floris, Francesco; Fornasari, Lucia; Bellani, Vittorio; Marini, Andrea; Banfi, Francesco; Marabelli, Franco; Beltram, Fabio; Ercolani, Daniele; Battiato, Sergio; Sorba, Lucia; Rossella, Francesco. 2019. "Strong Modulations of Optical Reflectance in Tapered Core–Shell Nanowires" Materials 12, no. 21: 3572.

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