Hybridized nanostructures composed by metals and dielectrics, semiconductors or organics offer new opportunities achieving new functionalities in nonlinear optics, plasmonics, sensing [1-4]. In particular GaAs- AlGaAs-GaAs core-shell-supershell nanowires (NWs) fabricated by self-catalyzed growth on Si substrates werepartially covered with gold, thus producing a symmetry breaking in the sample geometry that induces an “extrinsic” chiral response. The possibility to obtain optical activity with non-chiral elements was studied in the past [5], but only recently reconsidered [6,7]. This phenomenon is obtained when the experimental configuration composed by both the non-chiral object and the optical incident field is non-superimposable on its mirror image [8-10]. Here we use the photo-acoustic technique with circular polarised light to put into evidence the different absorption for circular polarizations of opposite headedness when the light impinges on such structures under a proper oblique angle [11], see Fig.1. The investigated samples are formed by NWs which length is about 5 micron and 140nm in diameter. The measure circular dichroism gives the highest response at about 20° of incident light. The obtained results are encouraging and our current efforts are dedicated to the development of prototype chiral photodetectors based on such structures including pn-junctions for collecting the charge carriers

GaAs-based nanowires partially covered with gold give rise to optical circular dichroism / Belardini, Alessandro; Leahu, Grigore; Petronijevic, Emilija; Centini, Marco; Li Voti, Roberto; Sibilia, Concita; Hakkarainen, Teemu; Koivusalo, Eero; Piton, Marcelo Rizzo; Suomalainen, Soile; Guina, Mircea. - 2017:(2017), pp. 1-1. ((Intervento presentato al convegno The European Conference on Lasers and Electro-Optics, CLEO_Europe 2017 tenutosi a Munich; Germany;.

GaAs-based nanowires partially covered with gold give rise to optical circular dichroism

Belardini, Alessandro;Leahu, Grigore;Petronijevic, Emilija;Centini, Marco;Li Voti, Roberto;Sibilia, Concita;
2017

Abstract

Hybridized nanostructures composed by metals and dielectrics, semiconductors or organics offer new opportunities achieving new functionalities in nonlinear optics, plasmonics, sensing [1-4]. In particular GaAs- AlGaAs-GaAs core-shell-supershell nanowires (NWs) fabricated by self-catalyzed growth on Si substrates werepartially covered with gold, thus producing a symmetry breaking in the sample geometry that induces an “extrinsic” chiral response. The possibility to obtain optical activity with non-chiral elements was studied in the past [5], but only recently reconsidered [6,7]. This phenomenon is obtained when the experimental configuration composed by both the non-chiral object and the optical incident field is non-superimposable on its mirror image [8-10]. Here we use the photo-acoustic technique with circular polarised light to put into evidence the different absorption for circular polarizations of opposite headedness when the light impinges on such structures under a proper oblique angle [11], see Fig.1. The investigated samples are formed by NWs which length is about 5 micron and 140nm in diameter. The measure circular dichroism gives the highest response at about 20° of incident light. The obtained results are encouraging and our current efforts are dedicated to the development of prototype chiral photodetectors based on such structures including pn-junctions for collecting the charge carriers
The European Conference on Lasers and Electro-Optics, CLEO_Europe 2017
Electronic, Optical and Magnetic Materials; Mechanics of Materials
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
GaAs-based nanowires partially covered with gold give rise to optical circular dichroism / Belardini, Alessandro; Leahu, Grigore; Petronijevic, Emilija; Centini, Marco; Li Voti, Roberto; Sibilia, Concita; Hakkarainen, Teemu; Koivusalo, Eero; Piton, Marcelo Rizzo; Suomalainen, Soile; Guina, Mircea. - 2017:(2017), pp. 1-1. ((Intervento presentato al convegno The European Conference on Lasers and Electro-Optics, CLEO_Europe 2017 tenutosi a Munich; Germany;.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1267104
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