Experimental realization of an epsilon-near-zero metamaterial at visible wavelengths

Maas, R.; Parsons, J.; Engheta, Nader; Polman, A.

doi:10.1038/nphoton.2013.256

Cited by 451 publications

(346 citation statements)

References 21 publications

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“…Experimental demonstrations of zero-index metamaterials typically involve metals operating around their plasma frequencies [10][11][12] or metallic resonators [13][14][15][16] , resulting in high loss and impedance mismatch. Recently, zero index was demonstrated by tuning the Mie resonances in a purely dielectric photonic crystal structure 17,18 .…”

Section: Introductionmentioning

confidence: 99%

On-chip zero-index metamaterials

et al. 2015

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Summary: Metamaterials with a refractive index of zero exhibit physical properties such as infinite phase velocity and wavelength. However, there is no way to implement these materials on a photonic chip, restricting the investigation and application of zero-index phenomena to simple shapes and small scales. We designed and fabricated an on-chip integrated metamaterial with a refractive index of zero in the optical regime. Light refracts perpendicular to the facets of a prism made of this metamaterial, directly demonstrating that the index of refraction is zero. The metamaterial consists of low-aspect-ratio silicon pillar arrays embedded in a polymer matrix and clad by gold films. This structure can be fabricated using standard planar processes over a large area in arbitrary shapes and can efficiently couple to photonic integrated circuits and other optical elements. This novel on-chip metamaterial platform opens the door to exploring the physics of zero-index and its applications in integrated optics.

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Section: Introductionmentioning

confidence: 99%

On-chip zero-index metamaterials

et al. 2015

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“…[4][5][6][7] By using adequate metal models, the concept of ENZ metamaterials has been scaled down to near infrared and visible wavelengths. [8][9][10] The field has matured significantly over the last years and several applications of ENZ-media have been proposed such as dielectric sensing, 11 nanocircuits, 12 Fourier transformation 13 and beamshaping. [14][15][16][17][18] In this work, the dispersion of metal-dielectric-metal plasmonic waveguides is exploited to artificially mimic an ENZ medium at optical wavelengths by working near the cut-off of the transverse electric TE 1 mode.…”

Section: Introductionmentioning

confidence: 99%

[INVITED] Epsilon-near-zero metalenses operating in the visible

Pacheco‐Peña

Navarro‐Cía

Beruete

2016

Optics & Laser Technology

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Several converging lenses working in the permittivity near to zero (ENZ) regime at optical frequencies are designed using an array of metaldielectric-metal plasmonic waveguides. These plasmonic waveguides show a dispersive nature that enable to mimic an effective ENZ medium when using the fast wave transverse electric (TE 1 ) mode near its cut-off wavelength. By arranging multiple plasmonic waveguides with the correct engineered dimensions, several metalenses, including graded index (GRIN) ones, and diffractive optical elements (i.e., zoned metalenses) are proposed. The metalenses are designed at  0 = 474.9nm (f = 631.67THz) with a focal length of 10.75 0 . Numerical results demonstrate that the best performance is obtained for the case of the GRIN metalens in terms of the focal position, transversal resolution and thickness, reducing its volume up to 52.3% with respect to the smooth-profiled plano-concave metalens.

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“…Moreover, zero parameter materials have been integrated with nonlinear elements to achieve controllable transmission 29 or to enhance the nonlinear response of Kerr-based structures in the optical regime 30,31 . Owing to the numerous potential applications and novel physical phenomena that can result from such media, great efforts have been put into the actual realization of those media, from naturally available materials [32][33][34] to using photonic crystals that exhibit dirac cone dispersion 35,36 and structures in the microwave regime 37,38 , and suggestions for the more challenging optical regime [39][40][41] where gain media has usually been exploited to overcome the problem of high losses 41 .…”

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confidence: 99%

Wave–matter interactions in epsilon-and-mu-near-zero structures

2014

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In recent years, the concept of metamaterials has offered platforms for unconventional tailoring and manipulation of the light-matter interaction. Here we explore the notion of 'static optics', in which the electricity and magnetism are decoupled, while the fields are temporally dynamic. This occurs when both the relative effective permittivity and permeability attain near-zero values at a given operating frequency. We theoretically investigate some of the resulting wave features in bounded scenarios, such as unusual radiation characteristics of an emitter embedded in such epsilon-and-mu-near-zero media in bounded environments. Using such media, one might in principle 'open up' and 'stretch' the space, and have regions behaving electromagnetically as 'single points' despite being electrically large. We suggest a possible design for implementation of such structures using a single dielectric rod inserted in a waveguide operating near its cutoff frequency, providing the possibility of having electrically large 'empty' volumes to behave as epsilon-and-mu-near-zero media.

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Experimental realization of an epsilon-near-zero metamaterial at visible wavelengths

Cited by 451 publications

References 21 publications

On-chip zero-index metamaterials

On-chip zero-index metamaterials

[INVITED] Epsilon-near-zero metalenses operating in the visible

Wave–matter interactions in epsilon-and-mu-near-zero structures

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