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

Pacheco‐Peña, Víctor; Navarro‐Cía, Miguel; Beruete, Miguel

doi:10.1016/j.optlastec.2016.01.009

Cited by 16 publications

(8 citation statements)

References 31 publications

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“…Inspired by the recent development in ENZ metamaterials, several applications have been reported including nanocircuits [32,33], nonlinear control [34], impedance matched coaxial to waveguide transitions [35], antennas [36][37][38], levitation of particles [39], Fourier transformation [40], and beam shaping [41][42][43][44][45], to name a few, demonstrating that this type of metamaterial can be utilized in a variety of applications and frequency ranges. It is important to highlight that some of these applications have been developed by simply using the structural dispersion of a narrow hollow rectangular waveguide working near the cutoff of the fundamental TE 10 mode in order to emulate an ENZ medium, as it was used several decades ago to emulate plasmas at microwave frequencies using parallel-plate waveguides [46].…”

Section: Introductionmentioning

confidence: 99%

On the performance of an ENZ-based sensor using transmission line theory and effective medium approach

et al. 2019

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In this paper we perform an in-depth theoretical study of a sensing platform based on epsilon-nearzero (ENZ) metamaterials. The structure proposed for sensing is a narrow metallic waveguide channel. An equivalent circuit model is rigorously deduced using transmission line theory, considering several configurations for a dielectric body (analyte sample) inserted within the narrow channel, showing good agreement with results obtained from numerical simulations. The transmission line model is able to reproduce even the most peculiar details of the sensing platform response. Its performance is then evaluated by varying systematically the size, position and permittivity of the analyte, and height of the ENZ channel. It is shown that the sensor is capable of detecting changes in the permittivity/ refractive index or position even with deeply subwavelength analyte sizes (∼0.05λ 0 ), giving a sensitivity up to 0.03 m/RIU and a figure of Merit ∼25. The effective medium approach is evaluated by treating the inhomogeneous cross-section of the analyte as a transmission line filled with a homogeneous material.

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Section: Introductionmentioning

confidence: 99%

On the performance of an ENZ-based sensor using transmission line theory and effective medium approach

et al. 2019

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“…Metamaterials have demonstrated that they allow successful control of the electromagnetic response of media, opening the gate to manipulation of wave propagation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Within this realm, metamaterials with a relative permittivity near zero [known as epsilon near zero (ENZ)] exhibit fascinating features that have been recently studied in different frequency bands of the electromagnetic spectrum, mainly, microwaves, millimeter waves, and nearinfrared and optical frequencies [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Much of the attention is due to the fact that the waves traveling inside these media show almost "infinite" phase velocity and wavelength, with nearly uniform spatial phase variation, giving rise to unconventional phenomena such as tunneling, squeezing, and supercoupling [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Realization of an Epsilon-Near-Zero Graded-Index Metalens at Terahertz Frequencies

et al. 2017

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The terahertz band has been historically hindered by the lack of efficient generators and detectors, but a series of recent breakthroughs have helped to effectively close the "terahertz gap." A rapid development of terahertz technology has been possible thanks to the translation of revolutionary concepts from other regions of the electromagnetic spectrum. Among them, metamaterials stand out for their unprecedented ability to control wave propagation and manipulate electromagnetic response of matter. They have become a workhorse in the development of terahertz devices such as lenses, polarizers, etc., with fascinating features. In particular, epsilon-near-zero (ENZ) metamaterials have attracted much attention in the past several years due to their unusual properties such as squeezing, tunneling, and supercoupling where a wave traveling inside an electrically small channel filled with an ENZ medium can be tunneled through it, reducing reflections and coupling most of its energy. Here, we design and experimentally demonstrate an ENZ graded-index (GRIN) metamaterial lens operating at terahertz with a power enhancement of 16.2 dB, using an array of narrow hollow rectangular waveguides working near their cutoff frequencies. This is a demonstration of an ENZ GRIN device at terahertz and can open the path towards other realizations of similar devices enabling full quasioptical processing of terahertz signals.

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“…Slits illuminated with the TE polarization exhibit a cut-off wavelength together with a resonance for transmission, enabling a fast phase modulation of the transmitted field, which is absent in the case of the TM polarization. Similarly, the dispersion of metal-dielectric-metal plasmonic waveguides is exploited to artificially mimic an epsilon-near-zero medium at optical wavelengths by working near the cut-off of the TE 1 mode [44].…”

Section: Gradient-index Metalensesmentioning

confidence: 99%

Recent Progress in Far-Field Optical Metalenses

Naserpour¹,

Hashemi²,

Rodríguez³

2017

Metamaterials - Devices and Applications

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In this chapter, a review of the recent advances in optical metalenses is presented, with special emphasis in their experimental implementation. First, the Huygens' principle applied to ultrathin engineered metamaterials is introduced for the purpose of giving curvature to the wavefront of free-space wave fields. Primary designs based on metallic nanoslits and holey screens occasionally with variant width are first examined. Holographic plasmonic lenses are also explored offering a promising route to realize nanophotonic components. More recent metasurfaces based on nano-antenna resonators, either plasmonic or high-index dielectric, are analyzed in detail. Furthermore, 2D material lenses in the scale of a few nanometers enabling the thinnest lenses to date are here considered. Finally, dynamically reconfigurable focusing devices are reported for creating a scenario with new functionalities.

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

Cited by 16 publications

References 31 publications

On the performance of an ENZ-based sensor using transmission line theory and effective medium approach

On the performance of an ENZ-based sensor using transmission line theory and effective medium approach

Experimental Realization of an Epsilon-Near-Zero Graded-Index Metalens at Terahertz Frequencies

Recent Progress in Far-Field Optical Metalenses

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