Artículo
Efficient ultrafast all-optical modulation in a nonlinear crystalline gallium phosphide nanodisk at the anapole excitation
Grinblat, Gustavo Sergio
; Zhang, Haizhong; Nielsen, Michael P.; Krivitsky, Leonid; Berté, Rodrigo; Li, Yi; Tilmann, Benjamin; Cortés, Emiliano; Oulton, Rupert F.; Kuznetsov, Arseniy I.; Maier, Stefan A.
Fecha de publicación:
08/2020
Editorial:
Science Advances is the American Association for the Advancement of Science
Revista:
Science Advances
e-ISSN:
2375-2548
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
High-refractive index nanostructured dielectrics have the ability to locally enhance electromagnetic fields with low losses while presenting high third-order nonlinearities. In this work, we exploit these characteristics to achieve efficient ultrafast all-optical modulation in a crystalline gallium phosphide (GaP) nanoantenna through the optical Kerr effect (OKE) and two-photon absorption (TPA) in the visible/near-infrared range. We show that an individual GaP nanodisk can yield differential reflectivity modulations of up to -40%, with characteristic modulation times between 14 and 66 fs, when probed at the anapole excitation (AE). Numerical simulations reveal that the AE represents a unique condition where both the OKE and TPA contribute with the same modulation sign, maximizing the response. These findings highly outperform previous reports on sub-100-fs all-optical switching from resonant nanoscale dielectrics, which have demonstrated modulation depths no larger than 0.5%, placing GaP nanoantennas as a promising choice for ultrafast all-optical modulation at the nanometer scale.
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Grinblat, Gustavo Sergio; Zhang, Haizhong; Nielsen, Michael P.; Krivitsky, Leonid; Berté, Rodrigo; et al.; Efficient ultrafast all-optical modulation in a nonlinear crystalline gallium phosphide nanodisk at the anapole excitation; Science Advances is the American Association for the Advancement of Science; Science Advances; 6; 34; 8-2020; 1-7
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