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Multipolar Resonances with Designer Tunability Using VO2 Phase-Change Materials

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 13, 044053 (2020)

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

Autores/as

JOHN, JIMMY

YAEL GUTIERREZ VELA

ZHANG, ZHEN

KARL, HELMUT

RAMANATHAN, SHRIRAM

OROBTCHOUK, RÉGIS

CUEFF, SÉBASTIEN