Active tuning of electromagnetically induced transparency from chalcogenide-only metasurface

Liu, Kuan; Lian, Meng; Qin, Kairong; Zhang, Shuang; Cao, Tun

doi:10.37188/lam.2021.019

Cited by 25 publications

(20 citation statements)

References 82 publications

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“…It is well-known that an important application of EIT is the slow-light effect. , The slow-light capability is characterized by the group refractive index n g , which can be calculated through the following formula , n normalg = prefix− c H dφ ( ω ) normald ω where c is the speed of light in vacuum, H is the thickness of the metasurface, φ is the phase of the transmitted light, and ω is the angular frequency. Figure e shows the calculated group refractive index with different crystallinities of GST, where the Si thickness is set as 250 nm.…”

Section: Results and Discussionmentioning

confidence: 99%

Tunable High-Q Resonance Based on Hybrid Phase-Change Metasurfaces

Fang

Pan

et al. 2023

ACS Appl. Opt. Mater.

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High-Q resonances based on metasurfaces have attracted widespread attention in recent years for enhancing light− matter interaction at the nanoscale. Particularly, bound states in the continuum provide a fascinating method for generating the high-Q resonances. However, the resonant wavelengths of most high-Q metasurfaces are fixed once they are fabricated. Here, we numerically demonstrate a tunable high-Q resonance by integrating a silicon metasurface with the phase-change material Ge 2 Sb 2 Te 5 . The hybrid metasurface can support both a magnetic dipole resonance and a toroidal dipole resonance. Notably, the toroidal dipole resonance can be converted into bound states in the continuum by adjusting the geometric parameters. Moreover, the wavelength of the high-Q toroidal dipole resonance can be dynamically tuned through the phase transition of Ge 2 Sb 2 Te 5 . In addition, a high-Q analogue of electromagnetically induced transparency is also numerically realized through the interaction between the magnetic dipole mode and toroidal dipole mode and can be switched off by the phase transition of Ge 2 Sb 2 Te 5 . The tunable high-Q metasurfaces have potential applications in nonlinear enhancement, biosensors, and slow-light devices.

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Section: Results and Discussionmentioning

confidence: 99%

Tunable High-Q Resonance Based on Hybrid Phase-Change Metasurfaces

Fang

Pan

et al. 2023

ACS Appl. Opt. Mater.

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“…The metasurfaceassisted law of refraction and reflection (MLRR) [38] , a kind of generalized law of reflection and refraction [11] , and broadband sub-diffraction focusing and imaging [26,39] have been demonstrated. Metasurfaces find widespread applications in planar lenses [40][41][42] , the photonic spin Hall effect (PSHE) [43,44] , directional coupling [45] , holographic imaging [46][47][48][49][50][51][52][53] , beam generation [30,[54][55][56] , and beam steering antennas [57] . For example, by matching the geometric phases of nano-slots on silver to specific superimpositions of the inward and outward surface plasmon profiles for the two spins, arbitrary spin-dependent orbitals can be generated in a slot-free region [58] .…”

Section: Geometric Phases In Spatially Rotated Anisotropic Elementsmentioning

confidence: 99%

Classical and generalized geometric phase in electromagnetic metasurfaces

Guo

Zhang

et al. 2022

Photonics Insights

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The geometric phase concept has profound implications in many branches of physics, from condensed matter physics to quantum systems. Although geometric phase has a long research history, novel theories, devices, and applications are constantly emerging with developments going down to the subwavelength scale. Specifically, as one of the main approaches to implement gradient phase modulation along a thin interface, geometric phase metasurfaces composed of spatially rotated subwavelength artificial structures have been utilized to construct various thin and planar meta-devices. In this paper, we first give a simple overview of the development of geometric phase in optics. Then, we focus on recent advances in continuously shaped geometric phase metasurfaces, geometric-dynamic composite phase metasurfaces, and nonlinear and high-order linear Pancharatnam-Berry phase metasurfaces. Finally, conclusions and outlooks for future developments are presented.

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“…They possess some dynamic control ability and adjustability. These unit cells may be made up of adjustable liquid crystals 14 , graphene paches 15 , graphene and metal patches 16 , metasurfaces with electromagnetically induced transparency (EIT) technology 17 , and metasurfaces with plasma induced transparency (PIT) technology 18 .…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of terahertz reflectarrays based on graphene cell clusters

Hosseini

Oraizi

2022

Sci Rep

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In this paper, the graphene cell-cluster is introduced, which is composed of an array of identical unit-cells placed in a geometrical configuration. Such graphene cell-clusters are then used for the realization of a reflectarray. To the best of our knowledge, identical unit-cells in a particular geometrical configuration have already been introduced, but the analytical formulas for this model have not been investigated so far. In this paper, the Fourier-optics and aperture field estimation methods are applied to investigate the effect of cell-cluster dimensions on the generation of specified far-field radiation patterns. Implementing cell-clusters in graphene reflectarrays and similar structures, and also applying the proposed formulas, lead to the simplicity of configuration and enhancing the design accuracy. First, the effect of cell-cluster dimensions on the reflectarray radiation pattern is investigated. Then, a reflectarray composed of graphene cell-clusters is designed. A new configuration of graphene unit-cell composed of two graphene layers is proposed, where a middle layer of metallic patch is inserted. In the common graphene unit-cells, the rate of amplitude variations is quite high and greatly depends on the variation of phase in the proposed unit-cell. However, the amplitude variation is quite smaller than the phase variations.

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Active tuning of electromagnetically induced transparency from chalcogenide-only metasurface

Cited by 25 publications

References 82 publications

Tunable High-Q Resonance Based on Hybrid Phase-Change Metasurfaces

Tunable High-Q Resonance Based on Hybrid Phase-Change Metasurfaces

Classical and generalized geometric phase in electromagnetic metasurfaces

Analysis and design of terahertz reflectarrays based on graphene cell clusters

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