Design of Multifunctional Tunable Metasurface Assisted by Elastic Substrate

Li, Jing; Fan, Hongjie; Ye, Han; Wu, Tong; Sun, Yuhang; Wang, Xueyu; Liu, Yumin

doi:10.3390/nano12142387

Cited by 10 publications

(3 citation statements)

References 51 publications

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“…Materials are also used in mechanically reconfigurable metasurfaces. Figure 15 c [ 263 ] shows a multifunctional metasurface composed of arrays of nano-structures embedded on a polydimethylsiloxane (PDMS) substrate. When applying strain to the metasurface, the elastic substrate is mechanically stretched but the nano-structures remain unchanged.…”

Section: Mechanical Techniquesmentioning

confidence: 99%

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

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Metasurfaces have shown their great capability to manipulate electromagnetic waves. As a new concept, reconfigurable metasurfaces attract researchers’ attention. There are many kinds of reconfigurable components, devices and materials that can be loaded on metasurfaces. When cooperating with reconfigurable structures, dynamic control of the responses of metasurfaces are realized under external excitations, offering new opportunities to manipulate electromagnetic waves dynamically. This review introduces some common methods to design reconfigurable metasurfaces classified by the techniques they use, such as special materials, semiconductor components and mechanical devices. Specifically, this review provides a comparison among all the methods mentioned and discusses their pros and cons. Finally, based on the unsolved problems in the designs and applications, the challenges and possible developments in the future are discussed.

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Section: Mechanical Techniquesmentioning

confidence: 99%

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

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“…Metasurfaces have attracted considerable attention due to their ability to control light propagation and light localization [ 1 , 2 , 3 ]. Using design methods for structural parameters of metacells, metasurfaces can be developed for many applications, such as beam splitters [ 4 ], holograms [ 5 ], ultra-narrow-band absorbers [ 6 , 7 ], filters, sensors [ 8 , 9 ], etc. A key concept is the generation of the high quality factor (Q factor).…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum

Fan

Sun

et al. 2023

Materials

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The bound state in the continuum (BIC) has paved a new way to achieve excellent localization of the resonant mode coexisting with a continuous spectrum in the metasurface. Here, we propose an all-dielectric metasurface consisting of periodic pairs of asymmetric crosses that supports multiple Fano resonances. Due to the sufficient degrees of freedom in the unit cell, we displaced the vertical bars horizontally to introduce in-plane perturbation, doubling the unit cell structure. Dimerization directly resulted in the folding of the Brillouin zone in k space and transformed the BIC modes into quasi-BIC resonances. Then, simultaneous in-plane symmetry breaking was introduced in both the x and y directions to excite two more resonances. The physical mechanisms of these BIC modes were investigated by multipole decomposition of the scattering cross section and electromagnetic near-field analysis, confirming that they are governed by toroidal dipole (TD) modes and magnetic dipole (MD) modes. We also investigated the flexible tunability and evaluated the sensing performance of our proposed metasurface. Our work is promising for different applications requiring stable and tunable resonances, such as optical switching and biomolecule sensing.

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“…Alternatively, varifocal metalenses with varifocal capability are inherently compact footprint and lightweight, bestowing them significant advantages in these circumstances. By far, varifocal metalenses have been implemented via several approaches, including microelectromechanical systems [32,33], stretching elastic substrate [8,34] and laterally actuating metalens doublets [35]. Nevertheless, these solutions still involve external mechanical movement, low yield and could be suspect to performance degradation over time.…”

Section: Introductionmentioning

confidence: 99%

Wavelength-actuated varifocal and polarization-insensitive metalenses assisted by monolayer single-celled phase-change metasurfaces

Zhang

et al. 2023

J. Phys. D: Appl. Phys.

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Varifocal metalenses with tunable focal length allowing for transforming the complex and bulky tunable lens kit into a single flat lens, show great potential applications in tomography techniques, 3D displays, multi-imaging processing, among others. However, varifocal metalenses that integrate key properties, such as modest efficiency, large NA as well as polarization insensitivity into one remain elusive. Here, we present a generic design principle enabling binary switching of polarization-insensitive bifocal metalenses via simply switching two target wavelengths. The underlying mechanism relies on independently tailoring two sets of distinct anisotropic nanofins that are intelligently integrated into a monolayer single-celled phase-change metasurface in the form of "cross" or "straight" composite, which not only enables the crosstalks between two wavelength channels minimized, but also allows for the metalens design to be endowed polarization-insensitive and varifocal performance while maintaining high focusing efficiency and diffraction-limited performance. Due to the noninterleaved arrangement making the meta-structure more compact, wavelength-actuated varifocal metalens with ultrahigh-NAs (0.89 and 0.95, respectively corresponding to the target wavelengths of λ1 and λ2) can be implemented with a field of view of 4° based on this principle. Additionally, we also demonstrate the versatility of our approach by successfully implementing the generation of the polarization-insensitive varifocal focusing optical vortex. Our design can easily extend to visible or THz wavebands and will enable enormous applications in miniaturized imaging devices such as cell phones, wearable displays, and virtual reality (VR)/augmented reality (AR).

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Design of Multifunctional Tunable Metasurface Assisted by Elastic Substrate

Cited by 10 publications

References 51 publications

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Asymmetric Cross Metasurfaces with Multiple Resonances Governed by Bound States in the Continuum

Wavelength-actuated varifocal and polarization-insensitive metalenses assisted by monolayer single-celled phase-change metasurfaces

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