Generation of diffraction-free beams using resonant metasurfaces

Bao, Rui; Mou, Zhen; Zhou, Changda; Bai, Qingwang; He, Xiaobo; Han, Zhanghua; Wang, Shuyun; Teng, Shuyun

doi:10.1088/1367-2630/abc084

Cited by 11 publications

(10 citation statements)

References 38 publications

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“…For the V-shaped nanohole, as shown in Figure 1 C, the parameters including the arm length, arm width and cross angle of two arms need to be determined in order to obtain the different resonant phase delays [ 25 ]. Among the simulated results, we select four V-shaped nanoholes with the arm width set at 40 nm and the arm length taking 158 nm, 148 nm, 110 nm and 113 nm.…”

Section: Determination For the Nanounit Parametersmentioning

confidence: 99%

“…The designed metasurface elements based on different working modes have different optical performance. Resonant phases caused by nanoantennas with different shapes and different lengths are utilized in the design of the beam deflector [ 24 ] and the non-diffraction beam generators [ 25 ]. The high working efficiency is obtained just because of the resonant interaction of light and nanounits.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Metalenses Based on Three Kinds of Phase Compensation Techniques

Zhou

Mou

et al. 2021

Nanomaterials

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The phase delays introduced by anisotropic nanounits include propagation phase delay, resonant phase delay and geometric phase delay. Various phase devices can be formed based on the metasurfaces consisting of anisotropic nanounits and the phase devices of the same kind function have different performances because of different working modes. In this paper, metalenses and vortex metalenses are chosen as examples to compare the optical performance of metasurface phase devices based on three kinds of phase compensation techniques. We design separately three kinds of metalenses and vortex metalenses using the cross nanoholes, L-shaped nanohole and V-shaped nanoholes and simulate numerically their intensity and phase distributions. Additionally, the results show the differences among these elements in structure complexity, polarization dependence, working efficiency and phase uniformity. The comparison for three kinds of metalenses clearly shows the merits of different phase compensation techniques and this work must be helpful for expanding the practical applications of metasurfaces.

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Section: Determination For the Nanounit Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Metalenses Based on Three Kinds of Phase Compensation Techniques

Zhou

Mou

et al. 2021

Nanomaterials

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“…The Pancharatnam–Berry phase, also known as the geometric phase, is a common method for performing phase modulation using MAs with space-variant optical axis orientations [ 173 , 174 ]. Axicons integrated into optical fiber [ 175 ], cascading lenses [ 176 ], and metallic subwavelength MSs [ 177 ] have all been used to create BBs. Ultrathin subwavelength MSs have gathered a lot of coverage because of their outstanding benefits.…”

Section: Meta-axicons-flat Opticsmentioning

confidence: 99%

Modern Types of Axicons: New Functions and Applications

Хонина

Kazanskiy

Khorin

et al. 2021

Sensors

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Axicon is a versatile optical element for forming a zero-order Bessel beam, including high-power laser radiation schemes. Nevertheless, it has drawbacks such as the produced beam’s parameters being dependent on a particular element, the output beam’s intensity distribution being dependent on the quality of element manufacturing, and uneven axial intensity distribution. To address these issues, extensive research has been undertaken to develop nondiffracting beams using a variety of advanced techniques. We looked at four different and special approaches for creating nondiffracting beams in this article. Diffractive axicons, meta-axicons-flat optics, spatial light modulators, and photonic integrated circuit-based axicons are among these approaches. Lately, there has been noteworthy curiosity in reducing the thickness and weight of axicons by exploiting diffraction. Meta-axicons, which are ultrathin flat optical elements made up of metasurfaces built up of arrays of subwavelength optical antennas, are one way to address such needs. In addition, when compared to their traditional refractive and diffractive equivalents, meta-axicons have a number of distinguishing advantages, including aberration correction, active tunability, and semi-transparency. This paper is not intended to be a critique of any method. We have outlined the most recent advancements in this field and let readers determine which approach best meets their needs based on the ease of fabrication and utilization. Moreover, one section is devoted to applications of axicons utilized as sensors of optical properties of devices and elements as well as singular beams states and wavefront features.

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“…a) Schematic diagram of metalens with single focusing vortex consisting of rectangular nanoholes, b) schematic diagram of multiplexing metalens with three focusing vortices consisting of rectangular nanoholes, [ 86 ] c) compound metalenses consisting of cross nanoholes and the generated double focusing vortices, [ 39 ] and d) vortex metalens consisting of V‐shaped nanoholes and the generated nondiffraction beams. [ 88 ] b) Reproduced with permission. [ 86 ] Copyright 2016, John Wiley & Sons.…”

Section: Phase Singular Fieldsmentioning

confidence: 99%

“…Figure 5d shows the design of the vortex axicon by using V‐shaped nanoholes and the generated vortex is located at the propagation axis. [ 88 ] The additional spatial variant phase for this vortex axicon satisfies

φ = \frac{2 π}{λ} r \sin β + l θ

where the deflection angle of β determines the focusing degree of light field, and the radius r of axicon and the deflection angle of axicon determine the existing region of the focusing vortex. Furthermore, the superposition of two focusing vortices with opposite topological charges can form the cosine Bessel beam, where one compound metasurface containing the structures of two axicons is used.…”

Section: Phase Singular Fieldsmentioning

confidence: 99%

Optical Singularity Built on Tiny Holes

Zhou

Mou

et al. 2021

Annalen der Physik

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Singular optics is a branch of modern optics, and it usually refers to various singularities including phase, polarization, and energy flux singularities. Lots of excellent researches in foundation and application fields relate to optical singularities. Nanotechnology enables the manipulation of optical singularities in nanometer scale. Metasurfaces consisting of nanoscatterers have aroused intensive interest in recent years because of the ultrathin structure and the powerful light manipulation ability. Optical singular fields generated by metasurfaces built on tiny holes attract much attention. The recent research progress about the optical singular fields in nanoscale is provided here and the physical mechanism of the formation of optical singularities including phase singularity, polarization singularity, and hybrid singularity are discovered in terms of tiny holes. The beneficial reference is provided here to investigate the related works, and the applications of optical singularities in nanometer scale are promoted.

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Generation of diffraction-free beams using resonant metasurfaces

Cited by 11 publications

References 38 publications

Performance Analysis of Metalenses Based on Three Kinds of Phase Compensation Techniques

Performance Analysis of Metalenses Based on Three Kinds of Phase Compensation Techniques

Modern Types of Axicons: New Functions and Applications

Optical Singularity Built on Tiny Holes

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