Focusing surface waves with an inhomogeneous metamaterial lens

Escobar, Marco Antonio Camacho; Berthomé, Matthieu; Ma, Chaoqun; Liu, Zhaowei

doi:10.1364/ao.49.000a18

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…Such geometry manipulation can alternatively be converted to spatially variant material property design. Inhomogeneous metamaterials have been utilized to focus light in the infrared 58,62 or surface waves 63 . The GRIN metalens, with appropriately designed permittivity profiles, was first investigated for its superresolution imaging, as well as its Fourier transform capabilities at optical wavelengths 20 .…”

Section: Principles Of the Metalensmentioning

confidence: 99%

Hyperlenses and metalenses for far-field super-resolution imaging

2012

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The resolution of conventional optical lens systems is always hampered by the diffraction limit. Recent developments in artificial metamaterials provide new avenues to build hyperlenses and metalenses that are able to image beyond the diffraction limit. Hyperlenses project super-resolution information to the far field through a magnification mechanism, whereas metalenses not only super-resolve subwavelength details but also enable optical Fourier transforms. Recently, there have been numerous designs for hyperlenses and metalenses, bringing fresh theoretical and experimental advances, though future directions and challenges remain to be overcome.O ptical microscopy has revolutionized many fields such as microelectronics, biology and medicine. However, the resolution of a conventional optical lens system is always limited by diffraction to about half the wavelength of light. This diffraction barrier arises from the fact that subwavelength information from an object is carried by high spatial-frequency evanescent waves, which only exist in the near field. To overcome this diffraction limit, pioneering work has been carried out, including near-field scanning microscopy 1 , as well as fluorescence-based imaging methods 2,3 . These scanning-or random sampling-based nonprojection techniques achieve super-resolving power by sacrificing imaging speed, making them uncompetitive for dynamic imaging.Lens-based projection imaging remains the best option for high-speed microscopy. Immersion techniques have been proposed to enhance resolution, but they are limited by the low refractive indices of natural materials 4 . Emerging within the last decade, the fields of plasmonics and metamaterials provide solutions for engineering extraordinary material properties not found in nature, such as negative index of refraction 5,6 or strongly anisotropic materials 7,8 . This has provided tremendous opportunities for novel lens designs with unprecedented resolution 9 . Initiated by Pendry's seminal concept of the perfect lens 10 , a number of superlenses were demonstrated with resolving powers beyond the diffraction limit [11][12][13][14][15][16][17] . The optical superlens first achieved sub-diffraction-limited resolution by enhancing evanescent waves through a slab of silver 11 . As the evanescent-field enhancement is enabled by surface plasmon excitation, the subwavelength image is typically limited to the near field of the metal slab. However, the hyperlens-a metamaterial-based lens-can send super-resolution images into the far field by introducing a magnification mechanism. This has been considered as one of the most promising candidates for practical applications since its first demonstration in 2007 (refs 13,14). Recently, various other metamaterial-based lenses, that is, metalenses, have also been developed with both

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Section: Principles Of the Metalensmentioning

confidence: 99%

Hyperlenses and metalenses for far-field super-resolution imaging

2012

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“…Currently, a great interest of researchers are attracted to study the properties of surface electromagnetic waves (SEW) in the structures, that have artificially created anisotropy, in particular in metamaterials [1][2][3][4]. Properties of surface waves are largely determined by the material parameters and the state of the adjacent media, so the corresponding solutions of wave equations are widely used to study the optical properties of different materials [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Dispersion Properties of Surface Polaritons in the Ferrite/Semiconductor Metamaterial in the Magnetic Field

Fedorin¹,

Хрипунов²

2016

J. Nano- Electron. Phys.

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In the given paper, the dispersion properties of surface electromagnetic waves at a plane interface between a homogeneous medium (vacuum) and a layered periodical structure, consisting of alternating layers of ferrite and a semiconductor, placed in an external magnetic field are studied. This structure is considered in the subwavelength approximation. To describe the dielectric and magnetic properties of the material under consideration, the effective medium theory has been applied. The material parameters have been described by means of effective components of the permittivity and permeability. It was found that in a certain range of frequencies and magnitudes of external magnetic fields, in such a structure the existence of surface electromagnetic waves occur, both TM and TE polarized. Due to the peculiarities of the structure under consideration it is possible to effectively control the parameters of surface waves.

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“…30 In the past inhomogeneous metamaterials have attracted much attention in cloaking, transformation optics, etc., and have also been shown to be able to focus optical beams and surface waves. 28,29,[31][32][33][34][35][36] Here we design new metalenses using gradient metamaterials, which we refer to as GRIN metalenses. The GRIN metalens possess super-resolving power as well as the Fourier transform capability.…”

Section: Introductionmentioning

confidence: 99%

Extraordinary light focusing and Fourier transform properties of gradient-index metalenses

Escobar

Liu

2011

Phys. Rev. B

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We propose and demonstrate a new type of metalenses that are phase compensated by gradient index (GRIN) or inhomogeneous permittivity metamaterials. Both elliptically and hyperbolically dispersive GRIN metalenses for both internal and external focusing are studied. The requirements for the GRIN metalenses and the light focusing characteristics are analyzed and numerically verified. The GRIN metalenses can achieve super resolution and have ordinary or extraordinary Fourier transform functions, thus enabling exotic applications.

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Focusing surface waves with an inhomogeneous metamaterial lens

Cited by 6 publications

References 24 publications

Hyperlenses and metalenses for far-field super-resolution imaging

Hyperlenses and metalenses for far-field super-resolution imaging

Dispersion Properties of Surface Polaritons in the Ferrite/Semiconductor Metamaterial in the Magnetic Field

Extraordinary light focusing and Fourier transform properties of gradient-index metalenses

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