Programmable Thermal Metamaterials Based on Optomechanical Systems

Zhou, Zhengyang; Shen, Xiangying; Fang, Chenchao; Huang, Jiping

doi:10.30919/esee8c336

Cited by 12 publications

(11 citation statements)

References 9 publications

(10 reference statements)

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“…Transformation theory, as a general and powerful methodology, has already been extended from wave systems (e.g., electromagnetic propagation 6 ) to diffusion systems (e.g., heat conduction 7,8 ), thus yielding the rapid development of thermal metamaterials or metadevices, 9 such as cloaks, [10][11][12][13][14][15][16][17][18] concentrators, 10,[18][19][20][21] rotators, 10,18 camouflaging, [22][23][24][25][26][27][28] and guiding. [29][30][31] However, these thermal metamaterials take only conductive effects into consideration.…”

Section: Introductionmentioning

confidence: 99%

Transformation Omnithermotics: Simultaneous Manipulation of Three Basic Modes of Heat Transfer

Xu¹,

Yang²,

Dai³

et al. 2020

ES Energy Environ.

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Conduction, convection, and radiation are three basic modes of heat transfer which often exist together. However, it is up to now a challenge to simultaneously manipulate them within the framework of transformation theory because they possess diverse properties with different mechanisms. To solve this problem, we develop a transformation theory to control them simultaneously (herein called transformation omnithermotics). With the present theory, we further design three devices including omnithermal cloaking, concentrating, and rotating as model applications. Finite-element simulations and experimental suggestions are also provided to confirm these applications. This work not only unifies the three basic modes of heat transfer within the theoretical framework of transformation omnithermotics, but also provides novel hints and potential applications to thermal management.

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Section: Introductionmentioning

confidence: 99%

Transformation Omnithermotics: Simultaneous Manipulation of Three Basic Modes of Heat Transfer

Xu¹,

Yang²,

Dai³

et al. 2020

ES Energy Environ.

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“…Owing to its special properties such as low loss and good complementary metal oxide semiconductor compatibility, [ 151,152 ] there was little doubt that all‐dielectric metamaterials would play a vital role in next generation of terahertz and photonic devices. Appropriate fabrication techniques could expand the applications of all‐dielectric metamaterials.…”

Section: Discussionmentioning

confidence: 99%

All‐Dielectric Metamaterial Fabrication Techniques

Wang

et al. 2020

Advanced Optical Materials

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region. Basically, all-dielectric metamaterials are composed of polymers, dielectrics, ferrites, or composite materials. [20-22] The unusual electromagnetic properties of all-dielectric metamaterials not only derive from their artificial structure, but also originate directly from the materials, revealing an approach to designing metamaterials with more freedom. [23] Since the initial proposal of all-dielectric metamaterials, various realization mechanisms have been studied and reported. [24-26] The most classical mechanism is based on the so-called Mie-resonance theory, and has been studied extensively. [27-29] In this strategy, dielectric particles with relatively high permittivity are used to generate strong magnetic or electric resonance through electromagnetic wave interaction. Therefore, a negative permeability or permittivity can be produced by the oscillation of the resulting magnetic or electric dipole. This mechanism is simple and versatile, and is generally adopted for the realization of all-dielectric metamaterials with low losses. [30] Ferromagnetic resonance (FMR) theory is another classical realization mechanism for all-dielectric metamaterials. [31,32] When the ferromagnetic resonance of the ferrite takes place, a negative permeability appears. Many factors can influence the FMR of the magnetic materials, including the bias magnetic field, magnetocrystalline anisotropy field, and demagnetization field. Hence, ferrite metamaterials with dual-band, multiband, or tunable properties can be obtained, providing a way to resolve the narrow band problem. Besides, mechanisms such as indefinite media or crystal lattice vibration have also been used to realize all-dielectric metamaterials. [33,34] When determining the realization mechanism for an all-dielectric metamaterial, one crucial factor must be considered: the choice of a fabrication method. Moreover, to achieve different performances, many types of materials with specific electromagnetic properties are used to prepare all-dielectric metamaterials. [35] Hence, researchers have developed various techniques for the fabrication of all-dielectric metamaterials derived from different materials. [36-40] In addition, the fabrication requirements are quite different for all-dielectric metamaterials operating at frequencies ranging from the microwave to optical regions. In particular, the size of the metamaterial unit cell is much smaller than the operational wavelength, making the fabrication technology for all-dielectric metamaterials become the key to their further application. Here, we present a comprehensive review of the various techniques used to produce all-dielectric metamaterials. We review the existing fabrication technologies for microwave, terahertz, and optical all-dielectric All-dielectric metamaterials with low loss are a rapidly developing research hotspot in the field of metamaterials, and offer additional design freedom for electromagnetic devices. Many types of fabrication techniques are used to prepare all-dielectric metamaterials, so as t...

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“…where V δ indicates the volume of the material within the skin depth δ ( 2/ r 0 δ ω σµ µ = , σ and μ r represent the intrinsic conductivity and magnetic permeability of the material, μ 0 denotes the permeability of free space), V is the volume of the material, ω indicates the angular frequency (ω = 2πf) of the applied magnetic field, μ m represents the effective magnetic permeability expressed as domain-wall and gyromagnetic resonance in Equation (5), n denotes the ratio of skin depth to penetration depth, and the thickness of the material is indicated by d. In Equation ( 5), χ d is the magnetic susceptibility for the domainwall, ω d indicates the resonance frequency of the domainwall, and β is the damping factors; χ s represents the magnetic susceptibility for the gyromagnetic spin motions, ω s denotes the resonance frequencies of spin components, and α represents the damping factors. The solid line in Figure 3a indicates the fitting results, suggesting that the decrease of permeability of LSMO can be well-described by the domain-wall resonance in the skin depth δ region.…”

Section: Demonstration Of Negative Permeabilitymentioning

confidence: 99%

“…The metamaterials have wide applications in the fields of controlling transient heat conduction, energy harvesting, space application, filter design, antenna design, EM absorbers, and cloaks. [1][2][3][4][5][6][7][8][9][10][11][12] Electromagnetic (EM) metamaterials with negative permittivity (ε) and/or permeability exhibit unprecedented properties when impinged by the EM radiations. [13] Nonetheless, the mechanism, which involves e g electron transfer via an oxygen intermediary between the octahedrally coordinated Mn 3+ -Mn 4 ions.…”

Section: Introductionmentioning

confidence: 99%

Metallic Ferromagnet of La_0.5Sr_0.5MnO₃ with Negative Permittivity and Permeability

Yan

Shen

Yin

et al. 2021

Adv Elect Materials

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geometrical arrangement and the dimensions of unit cells should be made considerably smaller than the characteristics of incident waves. [14][15][16][17][18] For instance, the dimensions of the microwave metamaterials need to be in the millimeter scale. As for infrared or visible metamaterials, only metallic nanostructures, particularly noble metals such as gold and silver with lower ohmic loss can sustain the optical waves. [19,20] To break the size scale and arrangement limits in the periodical-structured material design, random-structured metamaterials with inherent negative ε and/or μ are being sought. [21,22] So far, few theoretical and experimental works have focused on intrinsic single or double negative composites, including metal/ceramic composites and metal/polymer composites. [23][24][25][26][27][28][29][30][31][32][33] These composites are prepared by diluting the ferromagnetic metal or alloy fillers into insulating ceramics or polymers. The behavior of such composites heavily depends on the filler properties.Besides, numerous theoretical, computational, and experimental studies supported in exploring the metal-based composites and the single-phased (homogeneous) metamaterials with intrinsic double negative parameters. The target materials are focused on magnetic semiconducting CdCr 2 Se 4 , In 2−x Cr x O 3 , and La 2/3 Ca 1/3 MnO 3 , motivated by the coupling resonance mechanism between plasma and ferromagnetic resonances. [34][35][36] Veselago. predicted the behavior of metamaterial obtained from the magnetic semiconductor CdCr 2 Se 4 , but could not succeed because of considerable technological challenges in material synthesis. [34] Kussow and Akyurtlu theoretically predicted that, in polycrystalline form, the homogeneous magnetic semiconductor In 2−x Cr x O 3 should exhibit a negative refractive index at ≈10.48 THz. [35] For epitaxial La 2/3 Ca 1/3 MnO 3 film grown on MgO substrate, the negative magnetic μ has been estimated from transmittance data by assuming μ = 1 in the geometry h//μ 0 H. However, the reduction of the anisotropy for different incident angles remains the most difficult. [36] It can thus be concluded that homogeneous or single-phase metamaterials have not yet been realized experimentally.Metallic ferromagnet is believed to be a good candidate for single-phase metamaterials with simultaneous negative ε and μ. Perovskite manganite of La 1−x Sr x MnO 3 (0.2 ≤ x ≤0.5) is a metallic ferromagnet due to the Double-Exchange (DE)Since the electromagnetic metamaterials are artificial materials with subwavelength-scale periodic architectures, they can manipulate electromagnetic waves by exhibiting unusual properties of characteristic negative permittivity ε and permeability μ. However, their fabrication toward reducing the anisotropy for the realization of practical metamaterials is still a challenge. A homogeneous La 0.5 Sr 0.5 MnO 3 with negative properties synthesized by a facile method consisting of the sol-gel method and pressure-less sintering is proposed in this paper. By appropriate...

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Programmable Thermal Metamaterials Based on Optomechanical Systems

Cited by 12 publications

References 9 publications

Transformation Omnithermotics: Simultaneous Manipulation of Three Basic Modes of Heat Transfer

Transformation Omnithermotics: Simultaneous Manipulation of Three Basic Modes of Heat Transfer

All‐Dielectric Metamaterial Fabrication Techniques

Metallic Ferromagnet of La_0.5Sr_0.5MnO₃ with Negative Permittivity and Permeability

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Programmable Thermal Metamaterials Based on Optomechanical Systems

Cited by 12 publications

References 9 publications

Transformation Omnithermotics: Simultaneous Manipulation of Three Basic Modes of Heat Transfer

Transformation Omnithermotics: Simultaneous Manipulation of Three Basic Modes of Heat Transfer

All‐Dielectric Metamaterial Fabrication Techniques

Metallic Ferromagnet of La0.5Sr0.5MnO3 with Negative Permittivity and Permeability

Contact Info

Product

Resources

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Metallic Ferromagnet of La_0.5Sr_0.5MnO₃ with Negative Permittivity and Permeability