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Deterministic Insertion of KTP Nanoparticles into Polymeric Structures for Efficient Second-Harmonic Generation

Laboratoire de Photonique Quantique et Moléculaire, UMR 8537, École Normale Supérieure Paris-Saclay, Centrale Supélec, CNRS, Université Paris-Saclay, 61 avenue de Président Wilson, 94235 Cachan, France
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Crystals 2019, 9(7), 365; https://doi.org/10.3390/cryst9070365
Received: 27 May 2019 / Revised: 20 June 2019 / Accepted: 11 July 2019 / Published: 17 July 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
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Abstract

We investigate theoretically and experimentally the creation of virtually any polymer-based photonic structure containing individual nonlinear KTiOPO 4 nanoparticles (KTP NPs) using low one-photon absorption (LOPA) direct laser writing (DLW) technique. The size and shape of polymeric microstructures and the position of the nonlinear KTP crystal inside the structures, were perfectly controlled at nanoscale and on demand. Furthermore, we demonstrated an enhancement of the second-harmonic generation (SHG) by a factor of 90 when a KTP NP was inserted in a polymeric pillar. The SHG enhancement is attributed to the resonance of the fundamental light in the cavity. This enhancement varied for different KTP NPs, because of the random orientation of the KTP NPs, which affects the light/matter interaction between the fundamental light and the NP as well as the collection efficiency of the SHG signal. The experimental result are further supported by a simulation model using Finite-Difference Time-Domain (FDTD) method. View Full-Text
Keywords: direct laser writing; KTP; nonlinear optics; photonic coupling direct laser writing; KTP; nonlinear optics; photonic coupling
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Nguyen, D.T.T.; Lai, N.D. Deterministic Insertion of KTP Nanoparticles into Polymeric Structures for Efficient Second-Harmonic Generation. Crystals 2019, 9, 365.

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