Subwavelength multiple focal spots produced by tight focusing the patterned vector optical fields

Cai, Meng-Qiang; Tu, Chenghou; Zhang, Huihui; Qian, Sheng-Xia; Lou, Kai; Li, Yongnan; Wang, Hui-Tian

doi:10.1364/oe.21.031469

Cited by 23 publications

(11 citation statements)

References 24 publications

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“…By controlling the polarization state or phase of optical fields, novel optical fields can be obtained, e.g., vector optical field [1] and optical vortex [2] . Due to the fascinating properties after tight focusing, they are widely used in optical trapping and manipulation [3,4] , super-resolution imaging [5] , microfabrication [6][7][8] , and so on.…”

Section: Introductionmentioning

confidence: 99%

Dynamically taming focal fields of femtosecond lasers for fabricating microstructures

Cai

Wang

et al. 2022

中国光学快报

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Micromachining based on femtosecond lasers usually requires accurate control of the sample movement, which may be very complex and costly. Therefore, the exploration of micromachining without sample movement is valuable. Herein, we have illustrated the manipulation of optical fields by controlling the polarization or phase to vary periodically and then realized certain focal traces by real-time loading of the computer-generated holograms (CGHs) on the spatial light modulator. The focal trace is composed of many discrete focal spots, which are generated experimentally by using the real-time dynamically controlled CGHs. With the designed focal traces, various microstructures such as an ellipse, a Chinese character "Nan", and an irregular quadrilateral grid structure are fabricated in the z-cut LiNbO 3 wafers, showing good qualities in terms of continuity and homogeneity. Our method proposes a movement free solution for micromachining samples and completely abandons the high precision stage and complex movement control, making microstructure fabrication more flexible, stable, and cheaper.

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Section: Introductionmentioning

confidence: 99%

Dynamically taming focal fields of femtosecond lasers for fabricating microstructures

Cai

Wang

et al. 2022

中国光学快报

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“…However, in some specific applications, such as parallel imaging and multi-point fabrication, a 2D focal spot array is required due to its intrinsic advantages of high efficiency, and parallel and simultaneous processing [7,8]. Accordingly, many approaches have been exploited to directly realise the 2D multifocal spot array in the lateral focal plane of a high-NA objective [9][10][11][12][13][14][15][16][17][18][19][20]. One approach is employing optical elements, such as etalons [9], diffractive optical elements [10,11], microlens [12], and holography [13], to split the incident beam into multiple beams.…”

Section: Introductionmentioning

confidence: 99%

A 3D controllable diffraction‐limited spot array generated by means of a spaced‐dipole array

Huang

Lin

et al. 2021

IET Optoelectronics

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The creation of an array of three-dimensional (3D) multifocal spots in the focal region has attracted interest due to potential applications in parallel or simultaneous process areas. Based on the theory of pattern synthesis of antenna array and the electromagnetic time reversal technique, an optimisation-free approach is reported to construct a 3D controllable diffraction-limited spot array in the focal volume of a 4pi focussing system formed by two high-numerical-aperture (NA) objectives. The proposed method can be implemented readily by inversely focussing the field radiated from a virtual spaced-dipole antenna array mounted at the focus of the 4pi configuration. By solving the inverse problem, the required illumination in the pupil plane for producing the 3D spot array can be found. It is demonstrated that the 3D diffraction-limited focal spot array owns the properties of controllable polarisation, scheduled number, tunable location, and adjustable interval. This array may find applications in 3D simultaneous optical manipulation and trapping, 3D parallel fabrication, 3D optical data storage, and so on. K E Y W O R D S3D diffraction-limited spot array, 4pi configuration, polarisation, spaced-dipole antenna arrayThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Furthermore, the geometrical morphology of a femtosecond laser‐induced surface structure is mainly determined by the spatial intensity distribution of the femtosecond laser pulses. For example, rings can be fabricated by vortex beams for its doughnut‐shaped intensity distribution . Therefore, a method for controlling the spatial distribution of femtosecond laser intensity can control the geometrical morphology of the laser‐induced surface structures.…”

Section: Introductionmentioning

confidence: 99%

Flexible Gray‐Scale Surface Patterning Through Spatiotemporal‐Interference‐Based Femtosecond Laser Shaping

Jiang

et al. 2018

Advanced Optical Materials

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The function of a laser‐shaped material depends on the geometrical morphology of its laser‐induced surface structures, which is mainly determined by the spatial intensity distribution of the laser. However, conventional patterning methods based on laser shaping techniques have shortcomings in efficiency or flexibility. A novel patterning method is developed in the present study for mask‐free and flexible fabrication of surface structures through a time‐saving spatiotemporal‐interference‐based femtosecond laser shaping technique that is based on a Michelson interferometer. The phase‐difference distribution is controlled by a spatial light modulator so that the interference intensity distribution can be modulated to user‐designed shapes. The congruence between the interference intensity distribution and the geometries on phase holograms enables the generation of phase holograms without complicated algorithms and time‐consuming calculations. This uniquely simple technique realizes flexible gray‐scale patterning on bulk material surfaces with a single femtosecond laser pulse. Thus, by using the on‐the‐fly technique, fabrication of large‐area surface structures is realized. Moreover, this technique is applied to fabricate complex structures through splicing. As an application example, three types of terahertz filters, including band‐stop and band‐pass filters, are fabricated successfully; their transmittance is in good agreement with the finite‐difference time‐domain simulation results.

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Subwavelength multiple focal spots produced by tight focusing the patterned vector optical fields

Cited by 23 publications

References 24 publications

Dynamically taming focal fields of femtosecond lasers for fabricating microstructures

Dynamically taming focal fields of femtosecond lasers for fabricating microstructures

A 3D controllable diffraction‐limited spot array generated by means of a spaced‐dipole array

Flexible Gray‐Scale Surface Patterning Through Spatiotemporal‐Interference‐Based Femtosecond Laser Shaping

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