Super-resolution longitudinally polarized light needle achieved by tightly focusing radially polarized beams

Shi, Changkun; Nie, Zhongquan; Tian, Yuan; Liu, Chao; Zhao, Yong-chuang; Jia, Baohua

doi:10.1007/s11801-018-7162-6

Cited by 17 publications

(5 citation statements)

References 16 publications

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“…MBCPF was consisted by four belts. The parameters of MBCPF were optimized by particle swarm optimization algorithm (PSO) which was widely used in some reports [32,38]. The parameters of PSO were set as learning factor C 1 = 1.5, C 2 = 1.5, dimension D = 1, maximum inertia weight ω max = 0.8, minimum inertia weight ω min = 0.5, and number of iterations T = 1000.…”

Section: Resultsmentioning

confidence: 99%

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The generation of ultra-long longitudinally polarized optical needle with multi-belt complex phase filter

Liu,

Zhang,

et al. 2024

Phys. Scr.

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In the paper, a multi-belt complex phase filter was optimized by increasing the number of belts and changing phase and amplitude parameters of the filter. By focusing radially polarized sinh-Gaussian beams in single objective system with high-NA lens, longitudinal polarized optical needles were obtained with super-resolution in focal plane. And the super-resolution optical needle owned 36.6λ depth of focus and 0.42λ of full–width at half-maximum. The aspect ratio of the obtained optical needle was 87.14. The beam quality reached to 87.7%. The results demonstrated that the optimized multi-belt complex phase filter can lengthen depth of focus and compress transverse size simulta-neously. The obtained longitudinally polarization optical needles can be used in the fields of optical data storage, super-resolution imaging, particle trapping, nanolithogra-phy and so on.

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Section: Resultsmentioning

confidence: 99%

“…In 2018, Shi et al designed a ternary hybrid filter to modulate radially polarized BG beams. And a super-resolution longitudinal polarized optical needle was realized with DOF of 7.58λ [32].…”

Section: Introductionmentioning

confidence: 99%

The generation of ultra-long longitudinally polarized optical needle with multi-belt complex phase filter

Liu,

Zhang,

et al. 2024

Phys. Scr.

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show abstract

“…Nie et al proposed a complex modulation filter and optical needles were achieved with DOF of 5λ in 2014 [31]. Shi et al proposed a self-designed ternary filter and obtained optical needles with a DOF of 7.58λ in 2018 [32]. Zhang et al designed a fan-shaped pure phase filter and obtained optical needles with DOF of 22.8λ and lateral dimension FWHM of 0.6λ in 2020 [33].…”

Section: Introductionmentioning

confidence: 99%

Generation of ultra-long optical needles with dual-ring cosine filter

Zhang,

Wu,

Lan

et al. 2023

Phys. Scr.

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Combining the advantages of phase and amplitude modulation, we designed a dual-ring cosine filter which was consisted by an inner and outer ring, and the two rings have different number of paired cosine phase. Using the dual-ring cosine filter, ultra-long longitudinally polarized optical needles were obtained by tight focusing radially polarized Bessel-Gaussian beams with single lens system. And the obtained optical needles have depth of focus of 268λ, lateral full width of 0.37λ at half height, beams quality of 94% and axial uniformity of 95%. In addition, we found that the depth of focus of obtained optical needles can be further stretched and the lateral dimension can be further compressed by increasing the number of paired cosine phase. The ultra-long optical needles were appropriately applied in the fields of optical beams lithography, laser direct writing, particle acceleration and optical trapping.

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“…At present, the conventional methods represented by simulated annealing algorithm and genetic algorithm are the mainstream methods to design modulators. Such methods usually include the definition of fitness function, parameter scanning and other processes [13,[15][16][17][18], which are not only time-consuming and computational resourceconsuming, but also not adaptive.…”

Section: Introductionmentioning

confidence: 99%

Deep Learning: A Rapid and Efficient Adaptive Design Approach for Phase-Type Optical Needle Modulators

Wang

Zhang²,

et al. 2022

IEEE Photonics J.

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The radially polarized beams are modulated by phase-type optical needle modulators can be tightly focused to create needle-like focused beams, which are called optical needles. The use of optical needles with different resolutions and focal depths as direct writing heads for laser direct lithography enables periodic, cross-scale processing of high aspect ratio micro-nano structures with different line widths. The design of the phase-type optical needle modulators is the key to obtain optical needles with different resolutions and focal depths. However, the existing conventional methods for designing phase-type optical needle modulators rely on the physical model for generating optical needles and the defined fitness function, which makes their design time long and not adaptive. Based on the deep learning, a novel phase-type optical needle modulator design (PONMD) approach is proposed in this paper. The results show that the PONMD method takes 0.5526ms to design a phase-type optical needle modulator, and the similarity between the designed and target values is 96.73%. Compared with the conventional methods, the time consumption is reduced by about 8 orders of magnitude, and the similarity is improved by 11.19%. The PONMD approach has the advantages of adaptability, more efficient, less timeconsuming, and less computational resource-consuming.

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Super-resolution longitudinally polarized light needle achieved by tightly focusing radially polarized beams

Cited by 17 publications

References 16 publications

The generation of ultra-long longitudinally polarized optical needle with multi-belt complex phase filter

The generation of ultra-long longitudinally polarized optical needle with multi-belt complex phase filter

Generation of ultra-long optical needles with dual-ring cosine filter

Deep Learning: A Rapid and Efficient Adaptive Design Approach for Phase-Type Optical Needle Modulators

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