Oxygen Vacancy Controlled Hyperbolic Metamaterial Based on Indium Tin Oxide (ITO) Nanotubes with Switchable Optical Properties

verfasst von: Thomas Herzog, Atefeh Habibpourmoghadam, Sonja Locmelis, Antonio Calà Lesina, Sebastian Polarz
Abstract: Nanostructured metamaterials can offer optical properties beyond what is achievable in conventional media, such as negative refraction or sub-wavelength imaging. Due to their structural anisotropy, the class of high aspect ratio metamaterials is of interest for the possibility of achieving hyperbolic optical properties, i.e., both metallic and dielectric behavior based on the excitation direction. Although investigated numerically, the fabrication of tailor-made metamaterials is complex or often beyond the reach of current technology. For wire metamaterials composed of aligned metallic nanowires in a dielectric matrix, since the free carrier concentration in metals is fixed, light-matter interaction cannot be adjusted after fabrication. Here, metamaterials based on plasmonic ITO nanotubes with controllable hyperbolic response are introduced. The synthesis is achieved by a template-based liquid-phase technique. The tuning mechanism is based on controlling the carrier density in ITO via oxygen vacancy concentration. The process is reversible, the photonic features are activated by creating oxygen vacancies and can be switched off by filling them up again. Further, it is shown that the carrier concentration can also be controlled via a static electric field. Optical simulations support the experimental findings and highlight the parameters that determine the optical response of the metamaterial.
Organisationseinheit(en): Institut für Anorganische Chemie
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Institut für Transport- und Automatisierungstechnik
Hannoversches Zentrum für Optische Technologien (HOT)
Typ: Artikel
Journal: Advanced functional materials
Band: 34
Anzahl der Seiten: 13
ISSN: 1616-301X
Publikationsdatum: 04.11.2024
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Elektronische, optische und magnetische Materialien, Allgemeine Chemie, Biomaterialien, Allgemeine Materialwissenschaften, Physik der kondensierten Materie, Elektrochemie
Elektronische Version(en): https://doi.org/10.1002/adfm.202407552 (Zugang: Offen)

BibTeX

@article{9bb08ead9931414ca586cca190b3da45,
title = "Oxygen Vacancy Controlled Hyperbolic Metamaterial Based on Indium Tin Oxide (ITO) Nanotubes with Switchable Optical Properties",
abstract = "Nanostructured metamaterials can offer optical properties beyond what is achievable in conventional media, such as negative refraction or sub-wavelength imaging. Due to their structural anisotropy, the class of high aspect ratio metamaterials is of interest for the possibility of achieving hyperbolic optical properties, i.e., both metallic and dielectric behavior based on the excitation direction. Although investigated numerically, the fabrication of tailor-made metamaterials is complex or often beyond the reach of current technology. For wire metamaterials composed of aligned metallic nanowires in a dielectric matrix, since the free carrier concentration in metals is fixed, light-matter interaction cannot be adjusted after fabrication. Here, metamaterials based on plasmonic ITO nanotubes with controllable hyperbolic response are introduced. The synthesis is achieved by a template-based liquid-phase technique. The tuning mechanism is based on controlling the carrier density in ITO via oxygen vacancy concentration. The process is reversible, the photonic features are activated by creating oxygen vacancies and can be switched off by filling them up again. Further, it is shown that the carrier concentration can also be controlled via a static electric field. Optical simulations support the experimental findings and highlight the parameters that determine the optical response of the metamaterial.",
keywords = "infrared plasmonics, metamaterials, nanotubes, optical anisotropy, transparent conducting oxides",
author = "Thomas Herzog and Atefeh Habibpourmoghadam and Sonja Locmelis and {Cal{\`a} Lesina}, Antonio and Sebastian Polarz",
note = "Publisher Copyright: {\textcopyright} 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH.",
year = "2024",
month = nov,
day = "4",
doi = "10.1002/adfm.202407552",
language = "English",
volume = "34",
journal = "Advanced functional materials",
issn = "1616-301X",
publisher = "Wiley-VCH Verlag",
number = "45",
}