Invited Article: Broadband highly efficient dielectric metadevices for polarization control

Kruk, Sergey; Hopkins, Ben; Kravchenko, Ivan I.; Miroshnichenko, Andrey E.; Neshev, Dragomir N.; Kivshar, Yuri S.

doi:10.1063/1.4949007

Cited by 357 publications

(290 citation statements)

References 29 publications

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“…As plasmonic metasurfaces suffer from increasing dissipative losses at optical frequencies, as well as several undesirable loss channels occurring during the phase‐modulation process, such as diffraction, ordinary reflection/refraction, and polarization conversion losses, this initiates a new branch of research working with the dielectric analogs of metasurfaces. The high‐refractive‐index dielectric nanoparticles or nanodisks were found to be able to generate spectrally overlapping electric and magnetic resonances with comparable strengths, which is critical for the achievement of an optimal transmitted efficiency with the Huygens' metasurfaces . Different from their metallic counterparts where the high metallic losses at visible frequencies cause vanishing fields inside nanoparticles and thus lead to a negligible magnetic response, dielectric nanoparticles with their low intrinsic losses are able to couple the incoming wave to generate circular displacement currents inside the nanostructures and give rise to a strong magnetic dipole resonance ( Figure a,b) .…”

Section: Fundamental Theoretical Background – Generalized Snell's Lawmentioning

confidence: 99%

Fundamentals and Applications of Metasurfaces

2017

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Metasurfaces have become a rapidly growing field of research in recent years due to their exceptional abilities in light manipulation and versatility in ultrathin optical applications. They also significantly benefit from their simplified fabrication process compared to metamaterials and are promising for integration with on‐chip nanophotonic devices owing to their planar profiles. The recent progress in metasurfaces is reviewed and they are classified into six categories according to their underlying physics for realizing full 2π phase manipulation. Starting from multi‐resonance and gap‐plasmon metasurfaces that rely on the geometric effect of plasmonic nanoantennas, Pancharatnam–Berry‐phase metasurfaces, on the other hand, use identical nanoantennas with varying rotation angles. The recent development of Huygens' metasurfaces and all‐dielectric metasurfaces especially benefit from highly efficient transmission applications. An overview of state‐of‐the‐art fabrication technologies is introduced, ranging from the commonly used processes such as electron beam and focused‐ion‐beam lithography to some emerging techniques, such as self‐assembly and nanoimprint lithography. A variety of functional materials incorporated to reconfigurable or tunable metasurfaces is also presented. Finally, a few of the current intriguing metasurface‐based applications are discussed, and opinions on future prospects are provided.

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Section: Fundamental Theoretical Background – Generalized Snell's Lawmentioning

confidence: 99%

Fundamentals and Applications of Metasurfaces

2017

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“…We notice that S. Kruk et al . have reported a dielectric metasurface that its artificial birefringence reached 0.3 to realize polarization conversion in the 1550 nm band38. The basic principle of these two works is the same that the device controls specific spatial phase distribution by using the gradient changes of its subwavelength structure units, so as to realize large artificial birefringence and polarization conversion effectively.…”

Section: Resultsmentioning

confidence: 99%

Artificial high birefringence in all-dielectric gradient grating for broadband terahertz waves

Chen

Fan

et al. 2016

Sci Rep

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Subwavelength dielectric gratings are widely applied in the phase and polarization manipulation of light. However, the dispersion of the normal dielectric gratings is not flat while their birefringences are not enough in the THz regime. In this paper, we have fabricated two all-dielectric gratings with gradient grids in the THz regime, of which artificial birefringence is much larger than that of the equal-grid dielectric grating demonstrated by both experiments and simulations. The transmission and dispersion characteristics are also improved since the gradient grids break the periodicity of grating lattices as a chirp feature. From 0.6–1.4 THz, a broadband birefringence reaches 0.35 with a low dispersion and good linearity of phase shift, and the maximum phase shift is 1.4π. Furthermore, these gradient gratings are applied as half-wave plates and realize a linear polarization conversion with a conversion rate over 99%, also much higher than the equal-grid gratings. These gradient gratings show great advantages compared to the periodic gratings and provide a new way in the designing of artificial birefringence material.

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“…Ultra-thin metasurfaces consisting of subwavelength-scale structures have also been proposed to push the performance limits of blazed gratings operating at visible and infrared wavelengths. Initial metasurface-based deflectors took the form of titanium dioxide waveguide ensembles, 18 and more recent advances in this field have incorporated a range of geometrically simple [19][20][21][22][23] and topologically complex [24][25][26][27][28] nanowaveguide and nanoresonator architectures [ Fig. 1(d)].…”

confidence: 99%

High-performance axicon lenses based on high-contrast, multilayer gratings

et al. 2018

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Axicon lenses are versatile optical elements that can convert Gaussian beams to Bessel-like beams. In this letter, we demonstrate that axicons operating with high efficiencies and at large angles can be produced using high-contrast, multilayer gratings made from silicon. Efficient beam deflection of incident monochromatic light is enabled by higher-order optical modes in the silicon structure. Compared to diffractive devices made from low-contrast materials such as silicon dioxide, our multilayer devices have a relatively low spatial profile, reducing shadowing effects and enabling high efficiencies at large deflection angles. In addition, the feature sizes of these structures are relatively large, making the fabrication of near-infrared devices accessible with conventional optical lithography. Experimental lenses with deflection angles as large as 40° display field profiles that agree well with theory. Our concept can be used to design optical elements that produce higher-order Bessel-like beams, and the combination of high-contrast materials with multilayer architectures will more generally enable new classes of diffractive photonic structures.

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Invited Article: Broadband highly efficient dielectric metadevices for polarization control

Cited by 357 publications

References 29 publications

Fundamentals and Applications of Metasurfaces

Fundamentals and Applications of Metasurfaces

Artificial high birefringence in all-dielectric gradient grating for broadband terahertz waves

High-performance axicon lenses based on high-contrast, multilayer gratings

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