Tunable Polarization-Selective Absorption by Gating Ultrathin TiN Films in the Near-Infrared Region

Ultrathin titanium nitride (TiN) is a novel material platform for constructing active metasurfaces in the near-infrared region (NIR). Here, we realized tunable polarization-selective absorption by gating ultrathin TiN in an Ultrathin TiN Grating Metasurface (UTGM) and a gold resonator/TiN film Hybri...

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Published in:Photonics 2024-10, Vol.11 (10), p.917
Main Authors: Jiang, Huan, Huang, Junhao, Zhu, Wenchang, Wang, Yetian, V. Kildishev, Alexander
Format: Article
Language:English
Subjects:
Absorption
active metasurfaces
Carrier density
Dichroism
Electric fields
Gating
Gold
I.R. radiation
Linear dichroism
Metasurfaces
Near infrared radiation
Nitrides
Polarization
polarization-selective absorption
the near-infrared region
Tin
Titanium nitride
ultrathin TiN films
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creator Jiang, Huan
Huang, Junhao
Zhu, Wenchang
Wang, Yetian
V. Kildishev, Alexander
description Ultrathin titanium nitride (TiN) is a novel material platform for constructing active metasurfaces in the near-infrared region (NIR). Here, we realized tunable polarization-selective absorption by gating ultrathin TiN in an Ultrathin TiN Grating Metasurface (UTGM) and a gold resonator/TiN film Hybrid Metasurface (GTHM), respectively. The TM wave absorption (0.96) was much larger than that of the TE wave in the UTGM. When the carrier density decreased by 12%, the near-perfect TM absorption peak blue-shifted by 0.3 μm. Similarly, the linear dichroism (0.96) peak in GTHM blue-shifted by 0.12 μm when gating ultrathin TiN film. Active metasurfaces with tunable polarization-selective absorption have huge potential in dynamic integrated electro-optic devices in NIR.
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subjects Absorption
active metasurfaces
Carrier density
Dichroism
Electric fields
Gating
Gold
I.R. radiation
Linear dichroism
Metasurfaces
Near infrared radiation
Nitrides
Polarization
polarization-selective absorption
the near-infrared region
Tin
Titanium nitride
ultrathin TiN films
title Tunable Polarization-Selective Absorption by Gating Ultrathin TiN Films in the Near-Infrared Region
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