Controlling electromagnetic fields at boundaries of arbitrary geometries

Teo, Jonathon Yi Han; Wong, Liang Jie; Molardi, Carlo; Genevet, Patrice

doi:10.1103/physreva.94.023820

Cited by 44 publications

(35 citation statements)

References 54 publications

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“…Except for EM cloaking, conformal metasurfaces can be utilized to achieve other fascinating physical effects, which form important research directions [315][316][317][318][319][320]. For instance, Faraon's group proposed to decouple the optical properties of an object from its physical shape by capping a thin and flexible metasurface on the object conformally.…”

Section: Metasurface-based Cloakingmentioning

confidence: 99%

“…Recently, Genevet's group proposed the concept of "conformal boundary optics," which is an analytical method based on first-principle derivation that can help tailor the reflection and transmission fields at will. For any given object, one can use the developed theory to design an appropriate metacoating to cover it, in order to achieve the desired optical effects, such as anomalous diffraction and optical illusion [316]. Moreover, conformal metasurfaces can also be employed to realize even more complex functionalities, such as displays [317] and holograms [318,319].…”

Section: Metasurface-based Cloakingmentioning

confidence: 99%

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Electromagnetic metasurfaces: physics and applications

et al. 2019

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H-shaped resonators (inset) are adopted to realize, respectively, the desired B layer with negative ε and A layers with positive ε at the working frequencies [25]. (d) Top and middle panels: interference model and practical design of the metamaterial antireflection coating. Middle panel: experimentally measured reflectance and transmittance spectra for the normal incidence case. The solid and dashed lines represent the reflectance and transmittance of a bare GaAs surface [26]. (a) Figure 1 reprinted with permission from Martín-Moreno et al.,

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Section: Metasurface-based Cloakingmentioning

confidence: 99%

Section: Metasurface-based Cloakingmentioning

confidence: 99%

Electromagnetic metasurfaces: physics and applications

et al. 2019

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“…[151][152][153][154][155] Figure 6a shows an ultrathin, invisibility skin cloak for a visible wavelength. [151][152][153][154][155] Figure 6a shows an ultrathin, invisibility skin cloak for a visible wavelength.…”

Section: Other Applications In Beam Manipulation or Controlmentioning

confidence: 99%

“…[151][152][153][154][155] Figure 6a shows an ultrathin, invisibility skin cloak for a visible wavelength. [152] The theory, called conformal boundary optics, allows one to design the transmission and reflection at will for any arbitrary interface. This type of skin cloak can hide an arbitrarily shaped 3D object but works at a specific wavelength only and produces a specific wavefront.…”

Section: Other Applications In Beam Manipulation or Controlmentioning

confidence: 99%

Phase Manipulation of Electromagnetic Waves with Metasurfaces and Its Applications in Nanophotonics

Chen

Zhang

et al. 2018

Advanced Optical Materials

128

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elements. Thus, realizing phase manipulation of EM waves at the nanoscale has become a key pursuit for the development of modern optics and nanophotonics.Metamaterials are 3D artificial nanostructures composed of periodic subwavelength unit cells that resonantly couple to the incident EM waves, exhibiting effective electric and magnetic responses not found in nature. [1][2][3] However, these promising potential applications are hindered in their applications due to the challenges of fabricating the required complex 3D nanostructures and the inherent metallic losses and strong dispersion of plasmonic elements at optical frequencies. Planar metamaterials, or so-called metasurfaces, can be fabricated using existing technologies, such as the lithography method and have attracted increasing attention due to their feasibility, low loss, and ease of fabrication. [4,5] The most prominent advantage of metasurfaces is that they can generate spatial phase discontinuities over the full 2π range with an optically thin interface; moreover, the resolution is less than one wavelength. Thus, wavefronts can be shaped with a distance of much less than the wavelength. With the increasing development of metasurfaces, the aforementioned limitations can be solved using various ultrathin optical devices, which have properties superior to their conventional counterparts. [6][7][8][9][10][11][12] Here, we concentrate on the new capabilities of metasurfaces in recent years in manipulating the phase and propagation behaviors of EM waves. In Section 2, we briefly introduce the underlying mechanisms of three types of phase discontinuities. In Section 3, we review the basic applications of phase modulation using metasurfaces. In Section 4, we review more complex and advanced information photonics that have emerged from metasurfaces. In the last section, we provide concluding remarks and an outlook on future development directions. Three Basic Types of Phase Discontinuities Generated by Metasurfaces Resonance PhaseThe pioneering approach to achieve phase discontinuities was to use the dispersion of various metallic nanoantennas, as shown in the left panel of Figure 1a. The optical energy is coupled to surface EM waves propagating back and forth along the antenna surface. Due to the localized surface plasmon resonance, these waves are accompanied by oscillating free electrons Relative to conventional phase-modulation optical elements, metasurfaces (i.e., 2D versions of metamaterials) have shown novel optical phenomena and promising functionalities with more compact platforms and more straightforward fabrication processes. With the ability to generate a spatial phase variation, optical wavefronts can be manipulated into arbitrary shapes at will, enabling new phenomena and integrated ultrathin optical devices to be explored. This review is focused on recent developments regarding phase manipulation of electromagnetic waves with metasurfaces. Starting from their underlying physics for realizing full 2π phase manipulation, an overview of the applica...

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“…There is therefore a pressing need for extending current computational techniques for planar metasurfaces to curved metasurfaces. Early efforts in this direction include the FDTD analysis of spherical metasurface cavities [24] and arbitrarily curved metasurfaces [25], and the method of moments (MoM) analysis of circular-cylindrical metasurfaces [26]. This paper presents a generalization of the IE-MoM analysis technique of the circular-section cylindrical metasurface using circular cylindrical coordinates in [26] to a cylindrical metasurface with arbitrary cross section.…”

Section: Introductionmentioning

confidence: 99%

Wave Scattering by a Cylindrical Metasurface Cavity of Arbitrary Cross Section: Theory and Applications

Dehmollaian

Chamanara

Caloz

2019

IEEE Trans. Antennas Propagat.

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This paper presents a technique, combining the integral equations (IE) and the Generalized Sheet Transition Conditions (GSTCs) with bianisotropic susceptibility tensors, to compute electromagnetic wave scattering by cylindrical metasurfaces -forming two-dimensional porous cavities -of arbitrary cross sections. Moreover, it applies this technique to two problems -cloaking with circular and rhombic shapes and illusion optics with an elliptic shape -that both validate it, from comparison with specifications used in an exact synthesis of the metasurfaces, and reveal interesting capabilities of such metasurface structures. Particularly, active cylindrical metasurfaces can perfectly cloak and hence eliminate the extinction cross section of various cylindrical shapes, and simple purely passive versions of them, practically more accessible, still perform quite good cloaking and provide remakable extinction cross section reduction. onto the x and y directions of the global system, while leaving the shared coordinate z unchanged. We have then, for instance,

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Controlling electromagnetic fields at boundaries of arbitrary geometries

Cited by 44 publications

References 54 publications

Electromagnetic metasurfaces: physics and applications

Electromagnetic metasurfaces: physics and applications

Phase Manipulation of Electromagnetic Waves with Metasurfaces and Its Applications in Nanophotonics

Wave Scattering by a Cylindrical Metasurface Cavity of Arbitrary Cross Section: Theory and Applications

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