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Nanomaterials 2017, 7(11), 400; https://doi.org/10.3390/nano7110400

Self-Assembled InAs Nanowires as Optical Reflectors

1
Dipartimento di Fisica, Università di Pavia, via Bassi 6, 27100 Pavia, Italy
2
ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
3
Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP) and Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Via Musei 41, 25121 Brescia, Italy
4
National Enterprise for Nanoscience and Nanotechnology (NEST), Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, 56127 Pisa, Italy
*
Author to whom correspondence should be addressed.
Received: 19 October 2017 / Revised: 11 November 2017 / Accepted: 16 November 2017 / Published: 21 November 2017
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Abstract

Subwavelength nanostructured surfaces are realized with self-assembled vertically-aligned InAs nanowires, and their functionalities as optical reflectors are investigated. In our system, polarization-resolved specular reflectance displays strong modulations as a function of incident photon energy and angle. An effective-medium model allows one to rationalize the experimental findings in the long wavelength regime, whereas numerical simulations fully reproduce the experimental outcomes in the entire frequency range. The impact of the refractive index of the medium surrounding the nanostructure assembly on the reflectance was estimated. In view of the present results, sensing schemes compatible with microfluidic technologies and routes to innovative nanowire-based optical elements are discussed. View Full-Text
Keywords: semiconductor nanowire; nanostructured optical surface; sub-wavelength nanostructures; specular reflectance; sensing semiconductor nanowire; nanostructured optical surface; sub-wavelength nanostructures; specular reflectance; sensing
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Floris, F.; Fornasari, L.; Marini, A.; Bellani, V.; Banfi, F.; Roddaro, S.; Ercolani, D.; Rocci, M.; Beltram, F.; Cecchini, M.; Sorba, L.; Rossella, F. Self-Assembled InAs Nanowires as Optical Reflectors. Nanomaterials 2017, 7, 400.

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