| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Alvarez-Chavez, Jose Alfredo
University of Twente
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2022Optical properties of highly-crystalline tin-doped indium oxide films in their near-zero permittivity spectral regioncitations
- 2022Optical Properties and Nonlinear Optical Response of Zirconium-doped Indium Oxide in the Epsilon-Near-Zero Region
- 2022Broadband Nonlinear Optical Response of Indium–Zirconium Oxide in the Epsilon‐Near‐Zero Regioncitations
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article
Optical properties of highly-crystalline tin-doped indium oxide films in their near-zero permittivity spectral region
Abstract
Transparent conducting oxides (TCOs) have recently attracted much attention in the fields of optics and photonics because of their outstanding linear and nonlinear optical response in the near-zero permittivity spectral region. The optical response of these materials can be further enhanced by optimizing the material properties through fabrication. In particular, two important TCO parameters affecting the strength of the optical interactions are the optical mobility and effective mass of free electrons. In this work, we fabricate epitaxial, highly-textured, and polycrystalline tin-doped indium oxide (ITO) films to experimentally study the effect of the crystal quality on the optical mobility and effective electron mass, and on the optical properties of the material in the near-zero permittivity spectral region. Compared to polycrystalline ITO, we report an increase in the optical mobility from 38 to 67 cm2/<i style="box-sizing: border-box; color: rgb(34, 34, 34); font-family: Archivo, "Open Sans", "Helvetica Neue", Helvetica, "Arial Unicode MS", Arial, "Microsoft Yahei", "Hiragino Sans GB", sans-serif; font-size: 14px;">Vs</i> and a reduction in the effective mass from 0.3 <i style="box-sizing: border-box; color: rgb(34, 34, 34); font-family: Archivo, "Open Sans", "Helvetica Neue", Helvetica, "Arial Unicode MS", Arial, "Microsoft Yahei", "Hiragino Sans GB", sans-serif; font-size: 14px;">m</i>0 to 0.24 <i style="box-sizing: border-box; color: rgb(34, 34, 34); font-family: Archivo, "Open Sans", "Helvetica Neue", Helvetica, "Arial Unicode MS", Arial, "Microsoft Yahei", "Hiragino Sans GB", sans-serif; font-size: 14px;">m</i>0 in oxygen-deficient epitaxially grown ITO films. The improved material parameters reduces the imaginary part of the permittivity (from 0.56 to 0.42) and results in a steeper material dispersion for the high-crystal-quality ITO films. Based on these results, an analysis of the figure of merit for nonlinear refraction reveals that epi- and tex-ITO films can achieve a stronger nonlinear response than poly-ITO samples. Our results show that controlling the free-electron optical mobility and effective mass through crystal quality along with tuning the free-electron density allows for tailoring simultaneously the near-zero-permittivity wavelength and the optical losses at that wavelength, which is of utmost importance for the ENZ photonics applications.