Controllable electromagnetically induced transparency in an electrically tunable terahertz hybrid metasurface

Yang, Ruisheng; Zhang, Fuli; Li, Zhichen; Fu, Quanhong; Fan, Yuancheng

doi:10.1016/j.optlastec.2023.109380

Cited by 12 publications

(4 citation statements)

References 54 publications

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“…Conversely, crystalline Ge 3 Sb 2 Te 6 is converted to amorphous state by melting it above melting point of ∼640 °C, rapidly cooling it to a supercooled liquid, and then allowing it to solidify. Our work may bring a novel perspective on designing switchable metasurfaces [42][43][44].…”

Section: Discussionmentioning

confidence: 96%

Ge₃Sb₂Te₆-based mid-infrared metasurfaces for polarization control and wavefront steering

Sun

Nie

et al. 2023

Phys. Scr.

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Benefiting from excellent properties in wavefront control, germanium antimony telluride (GeSbTe)-based photonic devices provide new opportunities for manipulating electromagnetic wave. In this paper, Ge3Sb2Te6 meta-atoms are presented to realize polarization switching for mid-infrared wave through the state transition from the crystalline Ge3Sb2Te6 to the amorphous Ge3Sb2Te6. When the crystalline Ge3Sb2Te6 is involved, the proposed meta-atoms with 90° phase shift achieve high-efficiency polarization conversion and 360° phase coverage. As Ge3Sb2Te6 is changed to the amorphous state, phase coverage drops to only 36°, and most of the cross-polarized wave vanishes. Using these designed meta-atoms, three metasurfaces are implemented at 76.5 THz. Firstly, a gradient metasurface is constructed, and it dynamically switches between specular reflection and anomalous reflection. Next, a reflective metalens is proposed to realize switching between focusing and defocusing under different states of Ge3Sb2Te6. Lastly, a focused vortex beam is presented to reconstruct the mode of orbital angular momentum (OAM). All designs realize the switching between cross-polarization and co-polarization. Our work could have possible applications in fields such as mid-infrared switching, focusing, and wireless communication.

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Section: Discussionmentioning

confidence: 96%

Ge₃Sb₂Te₆-based mid-infrared metasurfaces for polarization control and wavefront steering

Sun

Nie

et al. 2023

Phys. Scr.

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“…Some typical resonance effects are generated by significant coupling based on the responses of various structure components in orthogonal polarization directions [15][16][17][18][19][20]. Electromagnetically induced transparency (EIT) is a slowlight effect, which is of great value in optical storage, optical switching, and nonlinear optics [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…Different from the ordinary single polarization-dependent resonance, this coupling resonance effect is not excited by a single polarization mode, but by the polarization modes of two orthogonal directions together, thus the EIT-like effect can be called a polarization-dependent coupling response. However, most of the previous studies have focused on the generation of EITlike metasurfaces by structure design and active materials modulation [15][16][17]25], but the mechanisms to precisely control and eliminate this polarization-dependent coupling effect are still required.…”

Section: Introductionmentioning

confidence: 99%

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Wang,

Fan,

Zhao

et al. 2024

J. Phys. D: Appl. Phys.

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The complex electromagnetic anisotropy of terahertz (THz) metasurfaces with geometric symmetry breaking has attracted extensive attention. Typical effects arise from the coupling of polarization responses in orthogonal directions of various components of the metasurface structure, such as the electromagnetically induced transparency (EIT) effect. However, it is a challenge to precisely control or perfectly avoid the polarization-dependent coupling responses. In this work, deep-subwavelength plasmonic gratings (PGs) with a fine wire width of 1 μm at the order of deep subwavelengths of 1/100 THz wave are fabricated by electron beam lithography, and these wire gratings are graphically designed as a C-shaped metasurface pattern with a period of 100 μm in sub-wavelength scale. The complete anisotropic response in the single-oriented PG metasurface is demonstrated by both simulation and experiments, where the polarization-dependent coupling effect is eliminated. More interestingly, the hybrid-oriented PG metasurface exhibits narrowband and wideband EIT effects in the x and y polarization directions with the maximum polarization extinction ratio of 20 dB, respectively, indicating this mechanism can realize more flexible manipulation of polarization-dependent coupling. This patterned deep-subwavelength PG provides a new structure and mechanism for excitation, regulation, and restriction of polarization-dependent mode coupling, and has important applications in THz spectroscopic detection, polarization imaging, and wireless communication.

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“…For example, tunable metasurfaces are widely used in zoom lens [1,2] , beam generation [3,4] , optical switches [5,6] , and dynamic holographic displays [7][8][9] via incorporating a functional material into the nanostructured design. The optical properties can be affected by different external excitations, such as electrical [10] , optical [11] , thermal [12] , mechanical [13] , and magnetic [14] stimulation. Notably, the active metasurface via magnetic control has the advantages of sub-nanosecond ultrafast response and is noninvasive, which exhibits an important potential in dynamic light manipulation.…”

Section: Introductionmentioning

confidence: 99%

Active metasurface via magnetic control for tri-channel polarization multiplexing holography

Bi,

Huang,

et al. 2024

中国光学快报

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Active metasurfaces have recently attracted more attention since they can make the light manipulation be versatile and real-time. Metasurfaces-based holography possesses the advantages of high spatial resolution and enormous information capacity for applications in optical displays and encryption. In this work, a tunable polarization multiplexing holographic metasurface controlled by an external magnetic field is proposed. The elaborately designed nanoantennas are arranged on the magneto-optical intermediate layer, which is placed on the metallic reflecting layer. Since the non-diagonal elements of the dielectric tensor of the magneto-optical material become non-zero values once the external magnetic field is applied, the differential absorption for the left and right circularly polarized light can be generated. Meanwhile, the amplitude and phase can be flexibly modulated by changing the sizes of the nanoantennas. Based on this, the dynamic multichannel holographic display of metasurface in the linear and circular polarization channels is realized via magnetic control, and it can provide enhanced security for optical information storage. This work paves the way for the realization of magnetically controllable phase modulation, which is promising in dynamic wavefront control and optical information encryption.

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Controllable electromagnetically induced transparency in an electrically tunable terahertz hybrid metasurface

Cited by 12 publications

References 54 publications

Ge₃Sb₂Te₆-based mid-infrared metasurfaces for polarization control and wavefront steering

Ge₃Sb₂Te₆-based mid-infrared metasurfaces for polarization control and wavefront steering

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Active metasurface via magnetic control for tri-channel polarization multiplexing holography

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Controllable electromagnetically induced transparency in an electrically tunable terahertz hybrid metasurface

Cited by 12 publications

References 54 publications

Ge3Sb2Te6-based mid-infrared metasurfaces for polarization control and wavefront steering

Ge3Sb2Te6-based mid-infrared metasurfaces for polarization control and wavefront steering

Terahertz structured deep-subwavelength plasmonic grating metasurface for manipulating polarization-dependent coupling response

Active metasurface via magnetic control for tri-channel polarization multiplexing holography

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Product

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Ge₃Sb₂Te₆-based mid-infrared metasurfaces for polarization control and wavefront steering

Ge₃Sb₂Te₆-based mid-infrared metasurfaces for polarization control and wavefront steering