Recent Progress in Far-Field Optical Metalenses

Naserpour, Mahin; Hashemi, Mahdieh; Rodríguez, Carlos J. Zapata

doi:10.5772/66467

Cited by 6 publications

(5 citation statements)

References 82 publications

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“…Metasurfaces, the two-dimensional form of metamaterials, are commonly used to fully control the wavefront of the incoming electromagnetic wave [1][2][3][4]. Metaatoms are the construction elements of the metasurfaces that can control the phase, amplitude and polarization of the incident electromagnetic fields [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Efficient arbitrary polarized light focusing by silicon cross-shaped metaatoms

Bazouband¹,

Bazouband²,

Golestanizade³

et al. 2021

J. Phys. D: Appl. Phys.

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The functionality of most of the metasurfaces that have been investigated so far, especially in illuminations with arbitrarily linearly polarized incident light, are restricted to x- or y-polarized incoming light. In particular, filtering out one of the two orthogonal polarizations of the incoming electromagnetic wave loses the incident light energy and limits the potential performance of the metasurface. In this study, by utilizing the cross-shaped silicon metaatoms that support the simultaneous excitation of electric and magnetic dipoles under the illumination of both x- and y- orthogonal polarizations, we overcome the polarization-restricted functionality of the metalenses. By selecting the metaatoms arrangement in the metalens structure, which follows the hyperbolic phase profiles for both x- and y-polarized incoming light waves at the same time, we obtain the light intensity distribution with the extended depth of focus (EDOF) or enhanced intensities at the focal spot with the focusing efficiency 65% for the numerical aperture of 0.7. Utilizing metaatoms with the ability to control the two orthogonal incoming polarizations develops a new methodology for using the full potential and intensity of the arbitrary polarized incoming light. The present design concept of metaatoms has several advantages that are not limited to metalenses alone but can be applied in all metasurfaces realized to have good efficiency. Finally, the proposed metalenses are suitable for imaging, optical tweezers and lithography applications, where subwavelength light intensity distributions with EDOF are the most desirable property.

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Section: Introductionmentioning

confidence: 99%

Efficient arbitrary polarized light focusing by silicon cross-shaped metaatoms

Bazouband¹,

Bazouband²,

Golestanizade³

et al. 2021

J. Phys. D: Appl. Phys.

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“…Metaatoms, the constitutive elements of metasurfaces with ability of controlling the incoming wavefront and with advantageous like the ease of fabrication and reduced dimensions, are widely used in the context of photonic devices [18,19]. In [20], generation of two-dimensional accelerating light by dielectric metasurfaces is reported.…”

Section: Introductionmentioning

confidence: 99%

Dielectric metalenses with off-axis and multi-focal spots based on converging Airy beams with different initial velocities or accelerations

Hashemi¹

2020

J. Phys. D: Appl. Phys.

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In the context of light focusing, converging Airy beams play an essential role. The two Airy beams that are commonly used in the literature for autofocusing of the Airy beams are mirror-symmetric. In this paper, we consider the two converging Airy beams to have different values of accelerations or initial velocities, the subject that up to our knowledge has not been studied before. To explore the effect of applying Airy beams with different initial velocities or accelerations, we apply the required phase and amplitude of the two launched Airy beams to a one-dimensional arrangement of dielectric c-shaped metaatoms. Silicon c-shaped metaatoms give us the opportunity of having full control of the phase and amplitude of the incident 700 nm light. Simulation results demonstrate that convergence of the two Airy beams with various values of initial velocities or accelerations causes the focal spot to deviate from the optical axis. The extent to which the focal spot deviates from the main axis depends strongly on the initial parameters of the included Airy beams. The focal spot coordinates that are achieved from the simulation results are well agreed with the analytical calculations that we also provided. Using the inutile space between the two launched Airy beams as an independent hyperbolic metalens, gives us the opportunity of designing a multi-focal metadevice with different off-axis and on-axis focal spot arrangements.

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“…While showing noticeable optical features, these metalenses require advanced lithography techniques for their fabrication that makes manufacturing on a large area extremely slow and time-consuming 18 . In the last years, much effort has been devoted to improve metalenses and metasurfaces for several applications, thus involving them as diffractive elements [19][20][21][22][23][24] , using various focal systems to obtain multiple focal length hence correcting the chromaticity 25,26 , for imaging 27,28 or image reconstruction through metalenses array 29 , or implementation in quantum electrodynamics systems 30 . In this work, we propose a novel and effective approach for developing ultrathin all dielectric flat metalenses.…”

Section: Introductionmentioning

confidence: 99%

Hyper Resolute Ultra thin Low Cost All-Dielectric Broadband Achromatic Metalenses

Lio,

Ferraro,

Ritacco

et al. 2020

Preprint

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Metalenses offer the ground-breaking opportunity to realize highly performing lowweight, flat and ultrathin, optical elements which substantially reduce size and complexity of imaging systems. Today, a major challenge in metalenses design is still the realization of achromatic optical elements ideally focussing a broad wavelength spectrum at a single focal length. Here we present a fast and effective way to design and fabricate extremely thin all-dielectric metalenses, optimally solving achromaticity issues by means of machine learning codes. The enabling technology for fabrication is a recently developed hyper resolute two-photon direct laser writing lithography equipment. The fabricated metalenses, based on a completely flat and ultrathin design, show intriguing optical features. Overall, achromatic behavior, focal length of 1.14 mm, depth of focus of hundreds of microns and thickness of only few nanometers allow considering the design of novel and efficient imaging systems in a completely new perspective.

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Recent Progress in Far-Field Optical Metalenses

Cited by 6 publications

References 82 publications

Efficient arbitrary polarized light focusing by silicon cross-shaped metaatoms

Efficient arbitrary polarized light focusing by silicon cross-shaped metaatoms

Dielectric metalenses with off-axis and multi-focal spots based on converging Airy beams with different initial velocities or accelerations

Hyper Resolute Ultra thin Low Cost All-Dielectric Broadband Achromatic Metalenses

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