Generation of rotating optical focal field employing turnstile antenna

Yu, Yanzhong; Huang, Han; Lin, Shi‐Ming; Zeng, Yongxi; Zhan, Qiwen

doi:10.1016/j.optcom.2021.127205

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The study employed a virtual antenna formed by two dipoles placed orthogonally along the x and y axes to produce a 3D quasi-spherical focal point using 4Pi focusing. According to the theory of electromagnetic radiation, the electric field distribution of the orthogonally superimposed dipole antenna can be expressed as [23]…”

Section: Methodsmentioning

confidence: 99%

Generation of 3D quasi-spherical multi-focus arrays and optical rings using orthogonally superimposed dipole antenna arrays

Xie,

Yu,

2023

J. Opt.

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This paper proposes a novel method to generate a three-dimensional (3D) quasi-spherical focal point with high longitudinal and transverse resolution in a 4Pi focusing system based on the radiation pattern of the orthogonally superimposed dipole antenna. In this paper, we present generated 3D quasi-spherical multi-focus arrays that are controllable and uniformly distributed and optical rings from the radiation patterns of antenna arrays in different configurations. The results showed that the generated focal point is smaller longitudinally (0.31λ) than transversely (0.41λ). This focal point has the smallest volume (~0.0273λ3) found. Moreover, it is highly homogeneous and has a small side lobe. The polarization at the center of the focal point is purely circular. The resulting 3D focal fields can be easily tailored by adjusting the modulation parameters of the orthogonally superimposed dipole arrays. Manipulating 3D optical focal fields with pre-defined characteristics of quasi-spherical focal points has a high degree of freedom. Many potential applications exist in arbitrarily oriented particle capture and guidance, micromanipulation, optical capture, and 3D optical data storage.

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Section: Methodsmentioning

confidence: 99%

Generation of 3D quasi-spherical multi-focus arrays and optical rings using orthogonally superimposed dipole antenna arrays

Xie,

Yu,

2023

J. Opt.

Self Cite

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show abstract

“…In this article, we consider that a virtual dipoles antenna element consisting of two electric dipoles placed orthogonally along the x-and y-axes, respectively, is located at the focus of a 4Pi focusing system to produce a quasi-spherical focal spot. The electric field distribution of the orthogonally superimposed dipoles antenna element can be expressed as [5] ( , ) ( cos cos co s s i n )…”

Section: Methodsmentioning

confidence: 99%

Creating a spatial quasi-spherical focal spot and optical ring with controllable characteristics based on orthogonally superimposed dipoles antenna

Xie,

Yu,

2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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The 3D quasi-spherical focal spot and optical ring may find potential application value in fields like arbitrarily oriented particle capture and guidance, super resolution microscopy and optical capture. On the basis of the radiation pattern of the orthogonally superimposed dipoles antenna in a 4Pi focusing system, this paper firstly proposes an approach to create a central pure circular polarization three-dimensional (3D) quasi-spherical focal spot with higher longitudinal resolution. In addition, we also use the radiation pattern of the ring array antenna composed of orthogonally superimposed dipoles antenna elements to flexibly generate a pre-parameterizable and uniformly distributed optical ring. The simulated numerical results show that the method achieves a quasi-spherical focal spot with a slightly smaller longitudinal size (~0.31λ) than the transverse size (~0.41λ), and with the smallest volume (~0.0273λ 3 ). The position, radius, ring number and layer number of the constructed optical ring can be adjusted arbitrarily, determined by the parameters of the ring array antenna.

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Flexible control of the focal spot with encoding metalens based on the digital addition principle of metasurfaces

Chen

Fang

et al. 2022

Optics and Lasers in Engineering

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Generation of rotating optical focal field employing turnstile antenna

Cited by 4 publications

References 19 publications

Generation of 3D quasi-spherical multi-focus arrays and optical rings using orthogonally superimposed dipole antenna arrays

Generation of 3D quasi-spherical multi-focus arrays and optical rings using orthogonally superimposed dipole antenna arrays

Creating a spatial quasi-spherical focal spot and optical ring with controllable characteristics based on orthogonally superimposed dipoles antenna

Flexible control of the focal spot with encoding metalens based on the digital addition principle of metasurfaces

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