Conformable Holographic Metasurfaces

Burch, J. M.; Wen, Dandan; Chen, Xianzhong; Falco, Andrea Di

doi:10.1038/s41598-017-04482-2

Cited by 41 publications

(49 citation statements)

References 37 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%

“…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]. 4.…”

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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Section: Wavefront Control In the Free Spacementioning

confidence: 99%

“…For the linearly polarized incident light, the optical illusion of a “vase” can be generated. Since helicity multiplexed holograms have great fabrication tolerance, the commonly used silicon substrate can be replaced by soft materials such as SU‐8, and the hologram is conformed to a pair of safety glasses (Figure e).…”

Section: Wavefront Control In the Free Spacementioning

confidence: 99%

Geometric Metasurfaces for Ultrathin Optical Devices

Wen

Yue

Liu

et al. 2018

Advanced Optical Materials

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occurring materials, it is difficult to further reduce the thickness of optical elements based on such a design theory. [1] Metamaterials are artificially structured materials which attain their properties from the unit structures rather than the constituent materials, [2] so their optical properties such as the effective electric permittivity and the magnetic permeability can be tuned accordingly. [3] To overcome the fabrication difficulties of metamaterials working in the optical range, a 2D metamaterial, or metasurface has been developed, which consists of a layer of optical antennas to locally modify the phase, amplitude, and polarization of the scattered light. [1b,4] Optical antennas are typically made of metals or high refractive index dielectrics, which can be fabricated through standard nanofabrication process, such as electron beam lithography, liftoff process, focused ion beam milling, or reactive ion etching, thus the complexity of the fabrication is greatly reduced in comparison with that for their 3D counterparts. Besides, metasurfaces can change the properties of the scattered light by using antennas with a dimension smaller than the operating wavelength, which exhibits high resolution and can avoid the higher diffraction orders of the traditional diffractive optical devices. In addition, the thickness of the metasurface is much smaller than the incident wavelength which makes them practical for device miniaturization and system integration.Metasurfaces are generally divided into two categories based on their mechanisms: [1a] the one based on the dispersion of antenna resonance and the one based on the Pancharatnam-Berry phase, namely, geometric phase. [5] The former relies on the delicate design of antenna geometry to obtain the desired phase delay of the scattered light. For example, the V-shaped antennas with various arm lengths and opening angles can provide phase gradient to the cross-polarized light, which verifies the generalized laws of reflection and refraction. [6] In contrast, the latter usually contains antennas with the same structure but spatially variant orientations. [7] Each antenna can be regarded as an anisotropic scatterer, which converts part of the incident circularly polarized (CP) light to its opposite helicity with a geometric phase ± 2ψ. The symbol ψ represents the orientation angle of the antenna, with + sign for the conversion from left-handed circularly polarized (LCP) light to righthanded circularly polarized (RCP) light, and the − sign for RCP to LCP light. Thus, a sampled phase function can be imparted to the scattered light from an array of antennas with designed Metasurfaces, planar metamaterials consisting of a single layer or several layers of artificial structures, not only form the basis for fundamental physics research but also have considerable technological significance. Metasurfaces can locally modify the optical property within a subwavelength range, which can facilitate device miniaturization and system integration. Metasurfaces have shown extraordin...

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“…This phenomenon can therefore be of use in many different fields of science starting from sensing to photocatalysis to on‐chip optical communications . Plasmonics has been successfully used to demonstrate such devices as optical tweezers, nanolasers, on‐chip modulators, solar water splitting electrochemical cells, lenses, holograms, heat‐assisted magnetic recording, etc. Such a broad range of devices can only be built on a backbone of in‐depth and thorough study of a material platform for plasmonics.…”

Section: Introductionmentioning

confidence: 99%

Strontium Niobate for Near‐Infrared Plasmonics

Dutta

Wan

Yan

et al. 2019

Advanced Optical Materials

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successfully used to demonstrate such devices as optical tweezers, [8,9] nanolasers, [10] on-chip modulators, [11] solar water splitting electrochemical cells, [12,13] lenses, [14] holograms, [15] heat-assisted magnetic recording, [16] etc. Such a broad range of devices can only be built on a backbone of in-depth and thorough study of a material platform for plasmonics. Gold [17][18][19][20] and silver [21][22][23][24][25] have been two of the most common choice of plasmonic materials. These noble metals have a high carrier concentration and show excellent plasmonic properties in the visible and near-infrared (NIR) wavelengths. Besides these materials, reports on plasmonics with copper [26,27] and aluminum [28,29] can also be found in literature with the latter being exquisitely used for plasmonics at UV wavelengths.Nevertheless, conventional plasmonic materials suffer from one or more drawbacks such as chemical and thermal stability, complementary metal-oxide-semiconductor (CMOS) processing and integration capabilities, etc. Such drawbacks are deterrent to practical applications of plasmonics. Therefore, emerging material platforms for plasmonics have been proposed. [30] Transition metal nitrides (TMNs) and transparent conducting oxides (TCOs) have emerged as alternate plasmonic materials that are devoid of some of the drawbacks of conventional noble metals such as gold and silver. [31] TMNs such as titanium nitride have optical properties similar to that of gold, is chemically resistant, and is stable under CMOS compatible processing conditions. [32,33] TCOs such as tin-doped indium oxide (ITO), aluminium and gallium-doped zinc oxides (AZO and GZO) are excellent plasmonic metals in the NIR wavelength spectrum and show ultrafast tunability of their optical properties under fs laser pulse illumination. [34][35][36] These properties make TMNs and TCOs ideal for many practical applications such as catalysis, [37] plasmonic optical modulators, [38] etc.In this work, we study another emerging material for plasmonics in the NIR, namely, strontium niobate (SNO). This material falls in the category of rare-earth perovskite conductors such as strontium molybdate (SrMoO 3 ) and strontium ruthenate (SrRuO 3 ). SrMoO 3 and SrRuO 3 are materials that have already been studied for their plasmonic properties in the infrared. [39,40] In addition, SNO has recently been suggested as a photocatalyst for water splitting process. [41] Detailed study on the crystal structure, electronic, and optical properties as a function of the film stoichiometry can also be found Plasmonics has developed greatly over the past two decades, and a plethora of plasmonic materials has been explored for practical plasmonic devices across various applications. While noble metals such as gold and silver are the most widely used plasmonic materials, other metals such as aluminum, copper, and magnesium have also been proposed as building blocks for plasmonics. Transparent conducting oxides (TCOs) such as aluminum-and gallium-doped zinc oxide and tin-doped ...

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Conformable Holographic Metasurfaces

Cited by 41 publications

References 37 publications

Electromagnetic metasurfaces: physics and applications

Electromagnetic metasurfaces: physics and applications

Geometric Metasurfaces for Ultrathin Optical Devices

Strontium Niobate for Near‐Infrared Plasmonics

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