Dielectric resonator nanoantennas at visible frequencies

Zou, Longfang; Withayachumnankul, Withawat; Shah, Charan M.; Mitchell, Arnan; Bhaskaran, Madhu; Sriram, Sharath; Fumeaux, Christophe

doi:10.1364/oe.21.001344

Cited by 195 publications

(135 citation statements)

References 31 publications

(30 reference statements)

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“…Subsequently, lift-off is performed in an acetone bath to remove the excess TiO 2 (Figure 1d). The lift-off is followed by an annealing step of 600 °C for 2 h in vacuum 27 to synthesize the anatase phase of TiO 2 to ensure low loss. This is followed by the removal of the TiO 2 /Pt sandwich from its rigid carrier by casting PDMS (2 mm thick) onto the TiO 2 layer, with a subsequent hotplate cure at 120 °C for 8 min and an immediate peel-off (Figure 1e).…”

Section: Methodsmentioning

confidence: 99%

Mechanically Tunable Dielectric Resonator Metasurfaces at Visible Frequencies

Gutruf¹,

et al. 2015

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Devices that manipulate light represent the future of information processing. Flat optics and structures with subwavelength periodic features (metasurfaces) provide compact and efficient solutions. The key bottleneck is efficiency, and replacing metallic resonators with dielectric resonators has been shown to significantly enhance performance. To extend the functionalities of dielectric metasurfaces to real-world optical applications, the ability to tune their properties becomes important. In this article, we present a mechanically tunable all-dielectric metasurface. This is composed of an array of dielectric resonators embedded in an elastomeric matrix. The optical response of the structure under a uniaxial strain is analyzed by mechanical−electromagnetic co-simulations. It is experimentally demonstrated that the metasurface exhibits remarkable resonance shifts. Analysis using a Lagrangian model reveals that strain modulates the near-field mutual interaction between resonant dielectric elements. The ability to control and alter inter-resonator coupling will position dielectric metasurfaces as functional elements of reconfigurable optical devices.

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Section: Methodsmentioning

confidence: 99%

Mechanically Tunable Dielectric Resonator Metasurfaces at Visible Frequencies

Gutruf¹,

et al. 2015

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“…Similar analyses show that the phase difference between points A and C is π and between A and D is 3π/2. Therefore, the metasurface in figure 4(c) 21 introduces a constant phase gradient in the azimuthal direction and the phase variation is 2π during one circle around the central point of the metasurface. The metasurface thus imprints a spiral phase distribution to the transmitted wavefront, creating a vortex beam with orbital angular momentum of L = 1.…”

Section: Metasurfaces Based On Pancharatnam-berry Phasementioning

confidence: 99%

“…It is therefore straightforward to achieve high numerical-aperture (NA) focusing without spherical aberration. 21 [53], (e)-(g) used with permission from [54].…”

Section: Wavefront Shaping and Beam Formingmentioning

confidence: 99%

“…A flat lens design at telecom wavelengths with 21 [55], (c) and (d) used with permission from [58], and (e) and (f) used with permission from [60].…”

Section: Wavefront Shaping and Beam Formingmentioning

confidence: 99%

“…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%

See 2 more Smart Citations

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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Radar Antennas

Niu

Mei

Cui

2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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Radar is an object‐detection system that transmits/receives and processes reflected electromagnetic waves to determine the location, angle, and velocity of targets such as aircraft, spacecraft, guided missiles, motor vehicles, and ships. In the radar system, the antenna is an essential component and plays an important role in detecting objects. There are various antenna candidates that can be adopted into radar systems. In this article, definitions of fundamental antenna parameters are given, and then various possible antenna candidates for radar systems are demonstrated and analyzed. Various reflectors with corresponding feeding source have been widely used as radar antennas with high gain and low cost, while phased‐arrays provide the radar system with the ability of dynamic scanning with a flat profile. Combing the advantages of the reflector and the phased array, the concept of reflectarray is introduced and the corresponding design principles and characteristics are discussed. Different types of radiation elements with corresponding characteristics for constructing reflectarrays are presented. Due to the innovative enhancement that novel metamaterials can provide to antenna engineering, radar antennas based on (or incorporating) metamaterials are also presented. In addition, for each antenna type representative examples are demonstrated for a more comprehensive understanding.

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Dielectric resonator nanoantennas at visible frequencies

Cited by 195 publications

References 31 publications

Mechanically Tunable Dielectric Resonator Metasurfaces at Visible Frequencies

Mechanically Tunable Dielectric Resonator Metasurfaces at Visible Frequencies

A review of metasurfaces: physics and applications

Radar Antennas

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