Details

Autor(en) / Beteiligte

• John, Jimmy
• Gutierrez, Yael
• Zhang, Zhen
• Karl, Helmut
• Ramanathan, Shriram
• Orobtchouk, Régis
• Moreno, Fernando
• Cueff, Sébastien

Titel

Multipolar Resonances with Designer Tunability Using VO2 Phase-Change Materials

Ist Teil von

• Physical review applied, 2020-04, Vol.13 (4)

Ort / Verlag

American Physical Society

Erscheinungsjahr

2020

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• 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 dielec-tric particles, while plasmonic resonances appear in metals. Here, we experimentally demonstrate that the multipolar resonances hosted by VO 2 nanocrystals can be dynamically tuned and switched thanks to the insulator-to-metal transition of VO 2. 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 VO 2 nanospheres embedded in SiO 2 and show that such a resulting metamaterial presents distinct optical tunability compared to unpatterned VO 2. 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.