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Abstract: Subwavelength nanoparticles can support electromagnetic resonances with distinct features depending on their size, shape, and nature. For example, electric and magnetic Mie resonances occur in dielectric particles, while plasmonic resonances appear in metals. Here, we experimentally demonstrate that the multipolar resonances hosted by VO2 nanocrystals can be dynamically tuned and switched thanks to the insulator-to-metal transition of VO2. Using both Mie theory and Maxwell-Garnett effective-medium theory, we retrieve the complex refractive index of the effective medium composed of a slab of VO2 nanospheres embedded in SiO2 and show that such a resulting metamaterial presents distinct optical tunability compared to unpatterned VO2. We further show that this approach provides a new degree of freedom to design low-loss phase-change metamaterials with record large figure of merit (?n/?k) and designer optical tunability.
Fuente: Physical Review Applied, 2020 13, 044053
Editorial: American Physical Society
Fecha de publicación: 01/04/2020
Nº de páginas: 11
Tipo de publicación: Artículo de Revista
DOI: 10.1103/PhysRevApplied.13.044053
ISSN: 2331-7019,2331-7043
Proyecto español: PGC2018-096649-B-100
Url de la publicación: https://doi.org/10.1103/PhysRevApplied.13.044053
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JOHN, JIMMY
YAEL GUTIERREZ VELA
ZHANG, ZHEN
KARL, HELMUT
RAMANATHAN, SHRIRAM
OROBTCHOUK, RÉGIS
FERNANDO MORENO GRACIA
CUEFF, SÉBASTIEN
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