Saturable absorption optimization of silica protected thin Sb2Te3 layers towards super-resolution applications

Abstract : Sb 2 Te 3 thin films are very promising candidates for nonlinear optics and several applications including super-resolution and nano-photoinscription. This work aims to offer a detailed study of the preparation of the thin films and their nonlinear optical properties under nanosecond laser excitation. Thin Sb 2 Te 3 films have been deposited by the electron beam deposition technique. The films have been protected by a thin silica layer, then annealed in order to enhance their nonlinearities by material crystallization. The annealing has been optimized by simultaneously recording the X-Ray diffraction diagrams. After this optimization, the annealing could be safely performed by heating in an oven. The nonlinear optical properties of the Sb 2 Te 3 thin films have been studied by means of the Z-scan technique employing 11 ns laser pulses at 1064 nm and 532 nm. High nonlinear absorption has been found showing the possibility to employ these materials for super-resolution, mode-locking and other applications.
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Submitted on : Wednesday, March 13, 2019 - 1:59:44 PM
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Charles Moisset, Antoine Bourgade, Julien Lumeau, Fabien Lemarchand, Carine Perrin-Pellegrino, et al.. Saturable absorption optimization of silica protected thin Sb2Te3 layers towards super-resolution applications. Optical Materials, Elsevier, 2018, 86, pp.7-11. ⟨10.1016/j.optmat.2018.09.028⟩. ⟨hal-02066437⟩

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