Reconfigurable Chiral Metasurface Absorbers Based on Liquid Crystals

Yin, Shengtao; Xiao, Dong; Liu, Jianxun; Li, Ké; He, Huilin; Jiang, Shouzhen; Luo, Dan; Sun, Xiao Wei; Ji, Wei; Liu, Yan Jun

doi:10.1109/jphot.2018.2878775

Cited by 31 publications

(22 citation statements)

References 41 publications

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“…Liu's group has designed several reconfigurable chiral metasurface absorbers by using a LC layer as an insulator layer. In one structure, the circular dichroism of the incident light will be modulated with the different alignments of the LC molecules, which could achieve the effect of reversing circular dichroism [172]. Other plasmonic LC reconfigurable chiral metasurfaces of sandwich-structure, as shown in Figure 9A, were simulated to spin-selectively absorb CP light at multiband frequencies [160] and efficiently [171].…”

Section: Metasurface In Fluid-backgroundmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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Metamaterials are composed of periodic subwavelength metallic/dielectric structures that resonantly couple to the electric and magnetic fields of the incident electromagnetic waves, exhibiting unprecedented properties which are most typical within the context of the electromagnetic domain. However, the practical application of metamaterials is found challenging due to the high losses, strong dispersion associated with the resonant responses, and the difficulty in the fabrication of nanoscale 3D structures. The optical metasurface is termed as 2D metamaterials that inherent all of the properties of metamaterials and also provide a solution to the limitation of the conventional metamaterials. Over the past few years, metasurfaces; have been employed for the design and fabrication of optical elements and systems with abilities that surpass the performance of conventional diffractive optical elements. Metasurfaces can be fabricated using standard lithography and nanoimprinting methods, which is easier campared to the fabrication of the counterpart 3 days metamaterials. In this review article, the progress of the research on metasurfaces is illustrated. Concepts of anomalous reflection and refraction, applications of metasurfaces with the Pancharatanm-Berry Phase, and Huygens metasurface are discussed. The development of soft metasurface opens up a new dimension of application zone in conformal or wearable photonics. The progress of soft metasurface has also been discussed in this review. Meta-devices that are being developed with the principle of the shaping of wavefronts are elucidated in this review. Furthermore, it has been established that properties of novel optical metasurface can be modulated by the change in mechanical, electrical, or optical stimuli which leads to the development of dynamic metasurface. Research thrusts over the area of tunable metasurface has been reviewed in this article. Over the recent year, it has been found that optical fibers and metasurface are coagulated for the development of optical devices with the advantages of both domains. The metasurface with lab-on fiber-based devices is being discussed in this review paper. Finally, research trends, challenges, and future scope of the work are summarized in the conclusion part of the article.‬‬‬‬‬‬‬

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Section: Metasurface In Fluid-backgroundmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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“…The free control of liquid crystal orientation can promote the development of manipulability of metamaterial-based devices. Based on the tunability of the refractive index of liquid crystal, more latent applications of liquid crystal background metamaterials have been discussed such as the perfect absorber [62,70,106,107], polarization converter [108,109], and modulators [110][111][112][113]. Salvatore Savo et al have illustrated the ability of functional liquid crystals in a metamaterial absorber array working as a spatial light modulator during THz wavelengths by experiments.…”

Section: Liquid Crystals-based Applicationsmentioning

confidence: 99%

A Review of Tunable Electromagnetic Metamaterials With Anisotropic Liquid Crystals

Yang

Fan

et al. 2021

Front. Phys.

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The performance of metamaterial is limited to a designed narrow band due to its resonant nature, it is highly desirable to incorporate active inclusions in metamaterials to extend the operation bandwidth. This review summarizes the development in realizing the tunability of electromagnetic response in metamaterials incorporated with nematic liquid crystal (LC). From rigorous comparison, it is found that the anisotropic property of nematic LC is essential in predicting the influence of LC molecular director orientation on the resonant frequency of metamaterials. By carefully designing the metamaterials and properly infiltrating LC, the operation frequency of single/double negative parameters of metamaterials can be dynamically modulated with remarkable red/blue-shift, depending on the LC molecular orientation angle. Moreover, the recent liquid crystal-based developments and novel applications are investigated and highlighted.

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“…Recently, there has been an increasing interest in reconfigurable metasurfaces for variable absorption [19]- [31]. The flow of liquid crystal molecules was employed to switch the absorption and transmission states of visible light [19], [20],…”

Section: Introductionmentioning

confidence: 99%

Characteristic Mode Design of Dual-Band Multistate Tunable Absorber Based on Programmable Flexible Metasurface

Li¹

2022

Preprint

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<p>Theory of characteristic modes (TCM) is applied to the design of a programmable flexible metasurface (PFMS) to achieve its multistate tunable microwave absorption. The designed metasurface consists of two layers. The first layer is a very thin polyimide (PI), on which unit cells consisting of two trapezoidal patches symmetrical along the central bias microstrip are printed. The second layer is grounded polyvinyl chloride (PVC) substrate to maintain the flexibility of the designed structure. The TCM is used to analyze and understand the modal behavior of the unit cell, which provides clear underlying electromagnetic (EM) physics to guide us how to load positive-intrinsic-negative (PIN) diode as a tunable resistance to achieve variable absorption states. The designed PFMS absorber have been fabricated and experimentally verified on the flat and cylindrical foams, respectively. Good agreements can be found for both planar and cylindrical metasurface structures between full-wave simulations and measurements. Less than -10 dB reflectivity is achieved from 3.6 to 10.7 GHz (99%). The mimicry of time-varying scattering cross section (SCS) is further realized through real-time coding PFMS absorber, which can be precisely tuned from -30 dB to 0 dB with a step of 1.5 dB at 5.5 GHz and 10.4 GHz, respectively.</p>

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Reconfigurable Chiral Metasurface Absorbers Based on Liquid Crystals

Cited by 31 publications

References 41 publications

A Review on Metasurface: From Principle to Smart Metadevices

A Review on Metasurface: From Principle to Smart Metadevices

A Review of Tunable Electromagnetic Metamaterials With Anisotropic Liquid Crystals

Characteristic Mode Design of Dual-Band Multistate Tunable Absorber Based on Programmable Flexible Metasurface

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