Research progress in metamaterials and metasurfaces based on the phase change material Ge2Sb2Te5

Tao, Weiwei; Wu, Yao; Zhao, Feifan; Li, Chenxia; Fang, Bo; Jing, Xufeng; Yu, Mingzhou

doi:10.1016/j.optlastec.2024.111064

Optics & Laser Technology

2024

DOI: 10.1016/j.optlastec.2024.111064

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Research progress in metamaterials and metasurfaces based on the phase change material Ge2Sb2Te5

Weiwei Tao,

Yao Wu,

Feifan Zhao

et al.

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Chiral optical modulation of Si-Ge₂Sb₂Te₅ composite metasurfaces driven by quasi-bound states in the continuum

Chen,

Yu,

Kang

et al. 2024

Appl. Opt.

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Chiral metasurfaces with high quality factors (Q-factors) are a promising platform for achieving chiral optical responses. However, the optical properties of most metasurfaces are fixed once they are fabricated. Here, we study the effect of phase-change material Ge2Sb2Te5 (GST) on the chiral optics of a planar chiral Si metasurface driven by bound states in the continuum (BICs), as the refractive index of the phase-change material changes before and after the phase change. The planar chiral silicon metasurface is capable of generating near-unity (0.99) circular dichroism and giant (0.996) linear dichroism in the infrared region. Notably, phase-change material GST is integrated into the Z-shaped Si metasurfaces. We actively tune the dissipative loss by causing the GST to undergo a phase transition, thereby modulating the optical chirality. In addition, we numerically simulate the effect of the thickness of the phase-change layer and the embedded position on the optical response. Compared with single-functional metasurfaces, this device exhibits better flexibility and more functionalities. It is demonstrated that the optical chirality of the metasurface can be well controlled using the phase-change material GST.

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Chiral optical modulation of Si-Ge₂Sb₂Te₅ composite metasurfaces driven by quasi-bound states in the continuum

Chen,

Yu,

Kang

et al. 2024

Appl. Opt.

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show abstract

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Research progress in metamaterials and metasurfaces based on the phase change material Ge2Sb2Te5

Cited by 1 publication

References 171 publications

Chiral optical modulation of Si-Ge₂Sb₂Te₅ composite metasurfaces driven by quasi-bound states in the continuum

Chiral optical modulation of Si-Ge₂Sb₂Te₅ composite metasurfaces driven by quasi-bound states in the continuum

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Research progress in metamaterials and metasurfaces based on the phase change material Ge2Sb2Te5

Cited by 1 publication

References 171 publications

Chiral optical modulation of Si-Ge2Sb2Te5 composite metasurfaces driven by quasi-bound states in the continuum

Chiral optical modulation of Si-Ge2Sb2Te5 composite metasurfaces driven by quasi-bound states in the continuum

Contact Info

Product

Resources

About

Chiral optical modulation of Si-Ge₂Sb₂Te₅ composite metasurfaces driven by quasi-bound states in the continuum

Chiral optical modulation of Si-Ge₂Sb₂Te₅ composite metasurfaces driven by quasi-bound states in the continuum