Recent progress in gradient metasurfaces

Estakhri, Nasim Mohammadi; Alù, Andrea

doi:10.1364/josab.33.000a21

Cited by 172 publications

(155 citation statements)

References 69 publications

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“…[162][163][164] This represents a convergence between different fields of study and is entirely valid. Metasurfaces have grown out of the paradigm of metamaterials, in which a volumetric array of periodic inclusions results in an effective medium with controllable and at times exotic properties that depend on the geometry and constituent bulk materials of these inclusions.…”

Section: Reflectarrays and Transmitarraysmentioning

confidence: 88%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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The terahertz range possesses significant untapped potential for applications including high-volume wireless communications, noninvasive medical imaging, sensing, and safe security screening. However, due to the unique characteristics and constraints of terahertz waves, the vast majority of these applications are entirely dependent upon the availability of beam control techniques. Thus, the development of advanced terahertz-range beam control techniques yields a range of useful and unparalleled applications. This article provides an overview and tutorial on terahertz beam control. The underlying principles of wavefront engineering include array antenna theory and diffraction optics, which are drawn from the neighboring microwave and optical regimes, respectively. As both principles are applicable across the electromagnetic spectrum, they are reconciled in this overview. This provides a useful foundation for investigations into beam control in the terahertz range, which lies between microwaves and infrared light. Thereafter, noteworthy experimental demonstrations of beam control in the terahertz range are discussed, and these include geometric optics, phased array devices, leaky-wave antennas, reflectarrays, and transmitarrays. These techniques are compared and contrasted for their suitability in applications of terahertz waves.

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Section: Reflectarrays and Transmitarraysmentioning

confidence: 88%

Tutorial: Terahertz beamforming, from concepts to realizations

et al. 2018

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“…Gradient metasurfaces have remarkable properties with respect to manipulating electromagnetic waves including controlling the propagation direction of an incident wave over subwavelength distances, modifying the optical wavefront, bending and focusing light, generating anomalous reflection and refraction phenomena as well as desired distributions of electromagnetic waves [1][2][3][4][5][6][7][8][9][10]. Metamaterial gradient index diffraction gratings, composed of metallic and dielectric parts, are utilized in gradient index optics applications [11], in multiband electromagnetic absorbers [12], and in the improvement of near-field optical enhancement [13].…”

Section: Introductionmentioning

confidence: 99%

Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Tsitsas

Valagiannopoulos

2017

J. Opt. Soc. Am. B

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Plane wave scattering by a planar metasurface composed of two periodically alternating rectangular dielectric rods is considered. A rigorous integral equation methodology is employed for the analysis and the accurate determination of the reflected and transmitted fields. Systematic optimizations with respect to the configuration's parameters are performed, which reveal that it is possible to obtain significantly enhanced anomalous reflection (with simultaneously suppressed ordinary reflection predicted by Snell's law) with power varying from 92% to almost 100% of the input one, depending on the color of the incident light. It is shown that these reflection properties are supported by metasurfaces easily realizable with specific low-loss dielectric materials. In this way, several all-dielectric optimal designs are reported that can be used in numerous applications demanding anomalous reflection in the visible range.

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“…Over the past decade, numerous novel optical properties have been demonstrated in this area, such as negative refractive index, super-lenses, cloaking, etc. [5][6][7][8][9][10][11][12][13][14]. The soul of metamaterials is the ability to realizing arbitrary manipulation of the electromagnetic waves in multiple parameters (frequency, amplitude, phase, and polarization) with multiple degrees of freedom, which make it possible for people to design devices with optical properties on demand.…”

mentioning

confidence: 99%

“…The soul of metamaterials is the ability to realizing arbitrary manipulation of the electromagnetic waves in multiple parameters (frequency, amplitude, phase, and polarization) with multiple degrees of freedom, which make it possible for people to design devices with optical properties on demand. Recently, metamaterials have been reported to provide a promising pathway toward the realizing of eicient manipulation of polarization state of electromagnetic waves via ultrathin, miniaturized, and easily integrable designs, which open up intriguing possibilities toward the realization of polarization state manipulation of electromagnetic waves in nanoscale and show ininite prospection in nanophotonics applications [4,5,[15][16][17].…”

mentioning

confidence: 99%

Polarization State Manipulation of Electromagnetic Waves with Metamaterials and Its Applications in Nanophotonics

Chen¹,

Liu²,

Li³

et al. 2017

Metamaterials - Devices and Applications

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Polarization state is an important characteristic of electromagnetic waves. The arbitrary control of the polarization state of such wave has atracted great interest in the scientiic community because of the wide range of modern optical applications that such control can aford. Recent advances in metamaterials provide an alternative method of realizing arbitrary manipulation of polarization state of electromagnetic waves in nanoscale via ultrathin, miniaturized, and easily integrable designs. In this chapter, we give a review of recent developments on polarization state manipulation of electromagnetic waves in metamaterials and discuss their applications in nanophotonics, such as polarization converter, wavefront controller, information coding, and so on.

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Recent progress in gradient metasurfaces

Cited by 172 publications

References 69 publications

Tutorial: Terahertz beamforming, from concepts to realizations

Tutorial: Terahertz beamforming, from concepts to realizations

Anomalous reflection of visible light by all-dielectric gradient metasurfaces

Polarization State Manipulation of Electromagnetic Waves with Metamaterials and Its Applications in Nanophotonics

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