Tunable and reconfigurable metasurfaces and metadevices

Nemati, Arash; Wang, Qian; Hong, Minghui; Teng, Jinghua

doi:10.29026/oea.2018.180009

Cited by 318 publications

(214 citation statements)

References 287 publications

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“…High‐index dielectric nanostructures have emerged as a promising alternative, and are expected to complement or even replace plasmonic nanostructures for a wide range of potential applications . Besides their complementary metal‐oxide‐semiconductor (CMOS) compatibility and low loss characteristics, dielectric nanostructures offer a powerful platform for efficient manipulation and localization of light based on the control over both optically induced electric and magnetic Mie‐type resonances, offering a great potential for future on‐chip applications in the nonlinear regime .…”

Section: Introductionmentioning

confidence: 99%

Dynamic Nonlinear Image Tuning through Magnetic Dipole Quasi‐BIC Ultrathin Resonators

et al. 2019

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Dynamical tuning of the nonlinear optical wavefront allows for a specific spectral response of predefined profiles, enabling various applications of nonlinear nanophotonics. This study experimentally demonstrates the dynamical switching of images generated by an ultrathin silicon nonlinear metasurface supporting a high‐quality leaky mode, which is formed by partially breaking a bound‐state‐in‐the‐continuum (BIC) generated by the collective magnetic dipole (MD) resonance excited in the subdiffractive periodic systems. Such a quasi‐BIC MD state can be excited directly under normal plane wave incidence and leads to a strong near‐field enhancement to further boost the nonlinear process, resulting in a 500‐fold enhancement of the third‐harmonic emission experimentally. Due to sharp spectral features and asymmetry of the unit cell, it allows for effective tailoring of the nonlinear emissions over spectral or polarization responses. Dynamical nonlinear image tuning is experimentally demonstarted via polarization and wavelength control. The results pave the way for nanophotonics applications such as tunable displays, nonlinear holograms, tunable nanolaser, and ultrathin nonlinear nanodevices with various functionalities.

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Section: Introductionmentioning

confidence: 99%

Dynamic Nonlinear Image Tuning through Magnetic Dipole Quasi‐BIC Ultrathin Resonators

et al. 2019

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“…Metamaterials are artificial engineered bulks with regular nanostructures that show exotic optical properties [117]. Combining the emerging field of optical metamaterials with LCs provides an extremely attractive quality, i.e., tunability, which is of the utmost importance in applications such as optically addressed spatial light modulators, tunable photonic materials and dynamic holography [118][119][120]. When integrating LCs with metamaterials, one can modify the director alignment of LCs by applying external stimuli and therefore manipulating the overall optical characteristics of the composite [119].…”

Section: Introductionmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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The research field of liquid crystals and their applications is recently changing from being largely focused on display applications and optical shutter elements in various fields, to quite novel and diverse applications in the area of nanotechnology and nanoscience. Functional nanoparticles have recently been used to a significant extent to modify the physical properties of liquid crystals by the addition of ferroelectric and magnetic particles of different shapes, such as arbitrary and spherical, rods, wires and discs. Also, particles influencing optical properties are increasingly popular, such as quantum dots, plasmonic, semiconductors and metamaterials. The self-organization of liquid crystals is exploited to order templates and orient nanoparticles. Similarly, nanoparticles such as rods, nanotubes and graphene oxide are shown to form lyotropic liquid crystal phases in the presence of isotropic host solvents. These effects lead to a wealth of novel applications, many of which will be reviewed in this publication. the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About 25 different thermotropic phases are known to date, and they are still increasing in number. Appl. Sci. 2019, 9, x FOR PEER REVIEW 2 of 47 unique effects of the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About...

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“…Different functions can be achieved based on reconfigurable metamaterials with different configurations of active components. Active functions and features achieved by tunable or reconfigurable metamaterials are highly desired in the field of science, engineering, and military . There are many tuning mechanisms for controlling the active components, such as electric, thermal, and optical .…”

Section: Introductionmentioning

confidence: 99%

“…Active functions and features achieved by tunable or reconfigurable metamaterials are highly desired in the field of science, engineering, and military. 60 There are many tuning mechanisms for controlling the active components, such as electric, [60][61][62][63][64] thermal, [65][66][67][68] and optical. [69][70][71][72] Various types of active or tunable materials have been explored in tunable and reconfigurable metamaterials such as transparent conductive oxides, 73,74 ferroelectrics, 75,76 liquid crystal, 77,78 graphene, 61,79,80 and phase change materials [81][82][83][84] in terahertz.…”

Section: Introductionmentioning

confidence: 99%

Tunable, reconfigurable, and programmable metamaterials

Bao

Cui

2019

Micro & Optical Tech Letters

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Electromagnetic metamaterials have been developing rapidly and attracted worldwide attentions since the concept has been proposed due to their powerful ability in controlling electromagnetic (EM) waves. Active functions and features achieved by tunable or reconfigurable metamaterials are highly desired in the field of science, engineering, and military. With the introduction of digital metamaterials, a bridge between the physical world and the information world is set up. When the digital metamaterials are programmable, they enable the wave‐based information coding and processing on the physical level of metamaterials in real time. In this paper, we will summarize the recent progress on tunable, reconfigurable, and programmable metamaterials. Firstly, we introduce the tunable and reconfigurable metamaterials in terahertz and microwave frequencies. Secondly, we review the functional devices and novel systems by the programmable metamaterials. Finally, we give a brief developing prospect to the programmable metamaterials.

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Tunable and reconfigurable metasurfaces and metadevices

Cited by 318 publications

References 287 publications

Dynamic Nonlinear Image Tuning through Magnetic Dipole Quasi‐BIC Ultrathin Resonators

Dynamic Nonlinear Image Tuning through Magnetic Dipole Quasi‐BIC Ultrathin Resonators

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Tunable, reconfigurable, and programmable metamaterials

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