Dielectric Metamaterials Based on Electric and Magnetic Resonances of Silicon Carbide Particles

Schuller, Jon A.; Zia, Rashid; Taubner, Thomas; Brongersma, Mark L.

doi:10.1103/physrevlett.99.107401

Cited by 319 publications

(185 citation statements)

References 15 publications

(18 reference statements)

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“…Left-handed behavior was observed in prisms formed by an array of periodic or random subwavelength BST rods [125], and negative magnetic response was also observed in a bulk metamaterials consisting of an array of subwavelength BST cubes [121]. In the optical frequency range, materials used to form dielectric metamaterials include tellurium (Te) cubes on barium fluoride (BaF 2 ) [126], cubic (β) phase silicon carbide (SiC) whiskers on zinc selenide (ZnSe) [127,128], in the mid-infrared; silicon cylindrical nano disks embedded within silicon dioxide [129] in the near infrared; silicon nano spheres on glass [130] and titanium dioxide cylindrical disks on silver [21] at visible frequencies.…”

Section: Dielectric Resonatorsmentioning

confidence: 99%

A review of metasurfaces: physics and applications

2016

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Abstract. Metamaterials are composed of periodic subwavelength metal/dielectric structures that resonantly couple to the electric and/or magnetic components of the incident electromagnetic fields, exhibiting properties that not found in nature. This class of micro-and nano-structured artificial media have attracted great interest during the past 15 years and yielded ground-breaking electromagnetic and photonic phenomena. However, the high losses and strong dispersion associated with the resonant responses and the use of metallic structures, as well as the difficulty in fabricating the micro-and nanoscale 3D structures, have hindered practical applications of metamaterials. Planar metamaterials with subwavelength thickness, or metasurfaces, consisting of single-layer or few-layer stacks of planar structures can be readily fabricated using lithography and nanoprinting methods, and the ultrathin thickness in the wave propagation direction can greatly suppress the undesirable losses. Metasurfaces enable a spatially varying optical response (e.g., scattering amplitude, phase, and polarization), mold optical wavefronts into shapes that can be designed at will, and facilitate the integration of functional materials to accomplish active control and greatly enhanced nonlinear response. This paper reviews recent progress in the physics of metasurfaces operating at wavelengths ranging from microwave to visible. We provide an overview of key metasurface concepts such as anomalous reflection and refraction, and introduce metasurfaces based on the PancharatnamBerry phase and Huygens' metasurfaces, as well as their use in wavefront shaping and beam forming applications, followed by a discussion of polarization conversion in fewlayer metasurfaces and their related properties. An overview of dielectric metasurfaces reveals their ability to realize unique functionalities coupled with Mie resonances and their low ohmic losses. We also describe metasurfaces for wave guidance and radiation control, as well as active and nonlinear metasurfaces. Finally, we conclude by providing our opinions of future developments in this rapidly developing research field.

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Section: Dielectric Resonatorsmentioning

confidence: 99%

A review of metasurfaces: physics and applications

2016

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“…Efficient anti-reflection coatings (AR) have been intensively studied with many different approaches having been explored for this purpose [1][2][3] , such as multi-layered thinfilms 4,5 , graded index matching via surface texturing with micro-and nano-structures [6][7][8][9][10][11] , plasmonic metasurfaces [12][13][14] and more recently, metasurfaces [15][16][17][18][19][20][21] based on ordered arrays of sub-micrometric dielectric antennas (dielectric Mie resonators [22][23][24][25][26][27][28] ). Depending on the application of the AR different aspects (lowest value of the total reflectance, broad spectral range, broad acceptance angle, transparency or light trapping) determine the optimal features and fabrication method.…”

Section: Introductionmentioning

confidence: 99%

Self-assembled antireflection coatings for light trapping based on SiGe random metasurfaces

Bouabdellaoui

Checcucci

Wood

et al. 2018

Phys. Rev. Materials

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We demonstrate a simple self-assembly method based on solid state dewetting of ultra-thin silicon films and germanium deposition for the fabrication of efficient anti reflection coatings on silicon for light trapping. Via solid state dewetting of ultra-thin silicon on insulator and epitaxial deposition of Ge we fabricate SiGe islands with a high surface density, randomly positioned and broadly varied in size. This allows to reduce the reflectance to low values in a broad spectral range (from 500 nm to 2500 nm) and a broad angle (up to 55 degrees) and to trap within the wafer a large portion of the impinging light (∼40%) also below the band-gap, where the Si substrate is non-absorbing. Theoretical simulations agree with the experimental results showing that the efficient light coupling into the substrate mediated by Mie resonances formed within the SiGe islands. This lithography-free method can be implemented on arbitrarily thick or thin SiO2 layers and its duration only depends on the sample thickness and on the annealing temperature.

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“…One of the most relevant properties concerninglight/ NW interaction is the ability of NWs to enhance their optical absorption/scattering for certain diameters, which are characterized by large local electric fields inside the NW [8]. The absorption/scattering resonances deal with different phenomena recently reported, including, among others, the enhanced photocurrent response of the NWs [7], enhanced elastic and inelastic light scattering by Si NWs [9], light extinction [10], light emission in different semiconductor NWs [11,12], and second harmonic generation [5]. Since the Raman intensity is proportional to the excitation light intensity and the scattering volume, an experimental study of the interaction of light with matter at the nanoscale can be carried out by its Raman response [13].…”

Section: Introductionmentioning

confidence: 99%

Local electric field enhancement at the heterojunction of Si/SiGe axially heterostructured nanowires under laser illumination

et al. 2016

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We present a phenomenon concerningelectromagnetic enhancement at the heterojunction region of axially heterostructured Si/SiGe nanowires when the nanowire is illuminated by a focused laser beam. The local electric field is sensed by micro Raman spectroscopy, which allowsthe enhancement of the Raman signal arising from the heterojunction region to be revealed; the Raman signal per unit volume increases at least tentimes with respect to the homogeneous Siand SiGe nanowire segments. In order to explore the physical meaning of this phenomenon, a threedimensional solution of the Maxwell equations of the interaction between the focused laser beam and the nanowire was carried out by finite element methods. A local enhancement of the electric field at the heterojunction was deduced.However, the magnitude of the electromagnetic field enhancement only approaches the experimental one when the free carriers are considered, showing enhanced absorption at the carrier depleted heterojunction region. The existence of this effect promises a way ofimprovingphoton harvesting using axially heterostructured semiconductor nanowires.

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Dielectric Metamaterials Based on Electric and Magnetic Resonances of Silicon Carbide Particles

Cited by 319 publications

References 15 publications

A review of metasurfaces: physics and applications

A review of metasurfaces: physics and applications

Self-assembled antireflection coatings for light trapping based on SiGe random metasurfaces

Local electric field enhancement at the heterojunction of Si/SiGe axially heterostructured nanowires under laser illumination

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