Spectral Nonlinear Optical Response of Ion-Implanted Au and Ag Nanoparticles in Sapphire: A Three-Level Model Description
Por:
Genchi, Domenico, Rangel-Rojo, Raul, Bornacelli, Jhovani, Crespo-Sosa, Alejandro, Oliver, Alicia, Cesca, Tiziana
Publicada:
13 oct 2020
Categoría:
Physics and astronomy (miscellaneous)
Resumen:
Nonlinear materials are of great technological interest for the
realization of nanophotonic devices able to control and manipulate
light. These properties can be specifically engineered by exploiting the
surface plasmon resonance of plasmonic nanocomposites, in proximity of
which nonlinear absorption and refraction are largely enhanced. An
exploration of the spectral, irradiance, and host material dependence of
the nonlinear parameters is important to be able to gain a thorough
understanding of the nonlinear response. In the present work, we
investigate the nonlinear optical response of Au and Ag nanoparticles
embedded in sapphire by a spectral z-scan characterization across the
localized surface plasmon band of the samples. We also present a
comparison of the results obtained for Au nanoparticles embedded both in
silica and in sapphire, produced under equivalent conditions, to test
the influence of the host material. We theoretically describe the
spectral trends of both the nonlinear absorption coefficient and
nonlinear refractive index by implementing a three-level model, which
provides important insights into the main physical parameters
controlling the observed spectral features, and the possibility of ab
initio composite designs with tailored properties.
Filiaciones:
Genchi, Domenico:
Univ Padua, Dept Phys & Astron, NanoStruct Grp NSG, Via Marzolo 8, I-35131 Padua, Italy
Rangel-Rojo, Raul:
CICESE, Div Fis Aplicada, Dept Opt, Ensenada, Baja California, Mexico
Bornacelli, Jhovani:
Inst Politecn Nacl, Escuela Super Ingn Mecan & Elect, Secc Estudios Posgrad & Invest, Unidad Zacatenco, Ciudad De Mexico 07738, Mexico
Crespo-Sosa, Alejandro:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Oliver, Alicia:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Cesca, Tiziana:
Univ Padua, Dept Phys & Astron, NanoStruct Grp NSG, Via Marzolo 8, I-35131 Padua, Italy
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