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Numerical Analysis of Nonlocal Optical Response of Metallic Nanoshells

Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia, Via Barsanti 14, 73010 Arnesano (LE), Italy
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Photonics 2019, 6(2), 39; https://doi.org/10.3390/photonics6020039
Received: 19 March 2019 / Revised: 4 April 2019 / Accepted: 5 April 2019 / Published: 8 April 2019
Nonlocal and quantum effects play an important role in accurately modeling the optical response of nanometer-sized metallic nanoparticles. These effects cannot be described by conventional classical theories, as they neglect essential microscopic details. Quantum hydrodynamic theory (QHT) has emerged as an excellent tool to correctly predict the nonlocal and quantum effects by taking into account the spatial dependence of the charge density. In this article, we used a QHT to investigate the impact of nonlocality and electron spill-out on the plasmonic behavior of spherical Na and Au nanoshells. We adopted a self-consistent way to compute the equilibrium charge density. The results predicted by QHT were compared with those obtained with the local response approximation (LRA) and the Thomas–Fermi hydrodynamic theory (TFHT). We found that nonlocal effects have a strong impact on both the near- and far-field optical properties of nanoshells, in particular, for the antibonding resonant mode. We also investigated the optical response of these systems for different thicknesses of the shell, both for Na and Au metals. View Full-Text
Keywords: Plasmonics; nanoshell; nonlocal response; hydrodynamic theory Plasmonics; nanoshell; nonlocal response; hydrodynamic theory
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Khalid, M.; Ciracì, C. Numerical Analysis of Nonlocal Optical Response of Metallic Nanoshells. Photonics 2019, 6, 39.

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