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

Hashemi, Mahdieh

doi:10.1088/1361-6463/ab7260

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…Due to the sub-wavelength dimensions of the metaatoms, their effective refractive index is a function of their constructing materials and depends on their geometry and dimensions [9]. Most of the metasurfaces considered so far are effective for a specific polarization of the incident light [10][11][12][13][14]. Hence, one of the two orthogonal electric field components of the incoming light is filtered out, leading to a loss in incident light energy.…”

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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Ultrasonic sharp autofocusing with acoustic metasurface

Jiang

et al. 2020

Phys. Rev. B

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Delayed-focus micro-angle measurement optical system based on structural segregation

Xing,

Li,

Cui

et al. 2024

Appl. Opt.

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In this paper, we propose a delayed-focusing type micro-angle measurement optical system based on the Cassegrain structure (cassette structure), analyze the basic cassette structure and the Galilean laser beam expanding system, and determine the primary and secondary mirror structure as a reflective focusless system as a determining module. This focusless system emits and receives parallel light, and the light source and detector separated by the beam splitter are designed as replaceable modules. Additionally, the imaging quality of the system can be optimized, or the effect of meeting different imaging requirements can be achieved, by changing the number and type of corrective mirrors and the parameters of the specific glass elements in the replaceable modules. After the final optimization, the radius of the imaging spot of the combined mirror group can be limited to 6.1 µm; the modulation transfer function is better than 0.6 at 100 lp/mm; the difference between the meridian and the arc-vector curves is less than 0.1; and the theoretical angular accuracy reaches 0.2″. The delayed-focusing system structure is analyzed under different temperature fields to provide guidance for the design of the subsequent structure temperature control. Comparison and analysis with commonly used angle measurement optical systems are also made. It is concluded that the structure meets the requirements for use in the on-orbit environment, completes the reuse of the established structural modules, and further saves the manufacturing cost, which provides a feasible solution to the problem of monitoring the small angular changes in the field of space.

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

Cited by 3 publications

References 28 publications

Efficient arbitrary polarized light focusing by silicon cross-shaped metaatoms

Efficient arbitrary polarized light focusing by silicon cross-shaped metaatoms

Ultrasonic sharp autofocusing with acoustic metasurface

Delayed-focus micro-angle measurement optical system based on structural segregation

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