Optical fibre nanotips are the key components in many applications such as nanoscale imaging and sensing. In this paper we describe and study a dynamic chemical etching method for the fabrication of optical nanoprobes. Our method allows to control of the shape and roughness of a fibre optical nanoprobe, by a combination of mechanical movements coupled to chemical etching. The stripped optical fibre end is dipped into a vial containing an aqueous hydrofluoric acid solution covered with a protection layer. The vial and the optical fibre are connected to motors allowing them to rotate independently around the fibre and the vial axis respectively. The basic idea of our method is to use rotation movements to generate different kind of flows inside the vial, which will be reflect in different kind of shapes and surface characteristics of the obtained nanoprobes. Different regimes can be generated by changing the ratio between the angular velocities and the ratio between the radii of optical fibre and vial, ranging from laminar flow to the onset of chaotic flow (Taylor-Couette flow theory). Computational fluid dynamic analysis show that different flow regimes correspond to different shear forces acting on the forming nanotip, in agreement with experimental results.

Dynamical Chemical Etching for Fabrication of Optical Fibre Nanotips / Barucci, A.; Cosi, F.; Giannetti, A.; Pelli, S.; Griffini, D.; Insinna, M.; Salvadori, S.; Tiribilli, B.; Righini, G. C.. - ELETTRONICO. - 2015:(2015), pp. 1-4. (Intervento presentato al convegno 17th Italian Conference on Photonics Technologies, Fotonica AEIT 2015 tenutosi a Torino, Italia nel 6-8 Maggio 2015) [10.1049/cp.2015.0131].

Dynamical Chemical Etching for Fabrication of Optical Fibre Nanotips

Salvadori S.;
2015

Abstract

Optical fibre nanotips are the key components in many applications such as nanoscale imaging and sensing. In this paper we describe and study a dynamic chemical etching method for the fabrication of optical nanoprobes. Our method allows to control of the shape and roughness of a fibre optical nanoprobe, by a combination of mechanical movements coupled to chemical etching. The stripped optical fibre end is dipped into a vial containing an aqueous hydrofluoric acid solution covered with a protection layer. The vial and the optical fibre are connected to motors allowing them to rotate independently around the fibre and the vial axis respectively. The basic idea of our method is to use rotation movements to generate different kind of flows inside the vial, which will be reflect in different kind of shapes and surface characteristics of the obtained nanoprobes. Different regimes can be generated by changing the ratio between the angular velocities and the ratio between the radii of optical fibre and vial, ranging from laminar flow to the onset of chaotic flow (Taylor-Couette flow theory). Computational fluid dynamic analysis show that different flow regimes correspond to different shear forces acting on the forming nanotip, in agreement with experimental results.
2015
978-1-78561-068-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2761121
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