All-optical tuning of EIT-like dielectric metasurfaces by means of chalcogenide phase change materials.
TLDR
This paper proposes a design of the metamaterial based on Si nanoresonators that can support an EIT-like resonant response and optically tune the response by hybridizing them with a layer of a phase change material.Abstract:
Electromagnetically induced transparency (EIT) is a pump-induced narrowband transparency window within an absorption line of the probe beam spectrum in an atomic system. In this paper we propose a way to bring together the all-dielectric metamaterials to have EIT-like effects and to optically tune the response by hybridizing them with a layer of a phase change material. We propose a design of the metamaterial based on Si nanoresonators that can support an EIT-like resonant response. On the top of the resonators we consider a thin layer of a chalcogenide phase change material, which we will use to tune the optical response. Our choice is Ge2Sb2Te5 (GST), since it has two stable phases at room temperature, namely amorphous and crystalline, between which it can be switched quickly, nonvolatively and reversibly, sustaining a large number of switching cycles. They differ in optical properties, while still having moderately low losses in telecom range. Since such dielectric resonators do not have non-radiative losses of metals around 1550nm, they can lead to a high-Q factor of the EIT-like response in this range. Firstly, we optimize the starting structure so that it gives an EIT-like response at 1550 nm when the GST layer is in the amorphous state. Our starting design uses glass as a substrate, but we also consider implementation in SOI technology. If we then switch the thin layer of GST to its crystalline phase, which has higher losses, the EIT-like response is red shifted, providing around 10:1 contrast at 1550nm. This reversible tuning can be done with an ns visible pulsed laser. We discuss the results of the simulation of the dielectric metasurface for different configurations and the tuning possibility.read more
Citations
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Journal ArticleDOI
Tunable nanophotonics enabled by chalcogenide phase-change materials
Sajjad Abdollahramezani,Omid Hemmatyar,Hossein Taghinejad,Alex Krasnok,Yashar Kiarashinejad,Mohammadreza Zandehshahvar,Andrea Alù,Ali Adibi +7 more
TL;DR: The unique material properties, structural transformation, and thermo-optic effects of well-established classes of chalcogenide PCMs are outlined and the emerging deep learning-based approaches for the optimization of reconfigurable MSs and the analysis of light-matter interactions are discussed.
Journal ArticleDOI
Analog of electromagnetically induced transparency in an E-shaped all-dielectric metasurface based on toroidal dipolar response
TL;DR: An analog of electromagnetically induced transparency (EIT) in an asymmetric E-shaped all-dielectric metasurface was proposed and numerically demonstrated in the near infrared spectral region.
Journal ArticleDOI
Comparison of Electromagnetically Induced Transparency Performance in Metallic and All-Dielectric Metamaterials
TL;DR: In this article, two kinds of metamaterials made of dielectric and metal with similar structure are compared in the near infrared waveband, and the results show that the metal-metamaterial analogs with higher Q-factor are superior to the aluminum analogs in the same waveband and comparable propagation distance.
Journal ArticleDOI
Realization of a near-infrared active Fano-resonant asymmetric metasurface by precisely controlling the phase transition of Ge2Sb2Te5.
Wei Zhu,Yuancheng Fan,Ce Li,Ruisheng Yang,Shi Yan,Quanhong Fu,Fuli Zhang,Changzhi Gu,Junjie Li +8 more
TL;DR: The approach to dynamically control a Fano-resonant metasurface paves the way to realizing various active photonic meta-devices involving PCM.
Journal ArticleDOI
Optical radiation manipulation of Si-Ge 2 Sb 2 Te 5 hybrid metasurfaces
Chaobiao Zhou,Shiyu Li,Menghui Fan,Xinfeng Wang,Yan-Li Xu,Weiwei Xu,Shuyuan Xiao,Mingzhe Hu,Jiangtao Liu +8 more
TL;DR: By introducing the phase-changing material Ge2Sb2Te5 (GST), which exhibits remarkably different optical properties in different crystalline states, this work investigates the active optical radiation manipulation of a resonant silicon metasurface.
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