Details
| Original language | English |
|---|---|
| Article number | 2407552 |
| Number of pages | 13 |
| Journal | Advanced functional materials |
| Volume | 34 |
| Issue number | 45 |
| Publication status | Published - 4 Nov 2024 |
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
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- Biomaterials
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Electrochemistry
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In: Advanced functional materials, Vol. 34, No. 45, 2407552, 04.11.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Oxygen Vacancy Controlled Hyperbolic Metamaterial Based on Indium Tin Oxide (ITO) Nanotubes with Switchable Optical Properties
AU - Herzog, Thomas
AU - Habibpourmoghadam, Atefeh
AU - Locmelis, Sonja
AU - Calà Lesina, Antonio
AU - Polarz, Sebastian
N1 - Publisher Copyright: © 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH.
PY - 2024/11/4
Y1 - 2024/11/4
N2 - 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.
AB - 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.
KW - infrared plasmonics
KW - metamaterials
KW - nanotubes
KW - optical anisotropy
KW - transparent conducting oxides
UR - http://www.scopus.com/inward/record.url?scp=85203073918&partnerID=8YFLogxK
U2 - 10.1002/adfm.202407552
DO - 10.1002/adfm.202407552
M3 - Article
AN - SCOPUS:85203073918
VL - 34
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 45
M1 - 2407552
ER -