Creation of super-length optical tube by phase modulated azimuthally polarized beam with multi-zone phase filter

Lalithambigai, K.; Anbarasan, P. M.; Rajesh, K. B.

doi:10.1016/j.ijleo.2015.02.009

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…Recently, the investigation on super-resolution longitudinally polarized optical needles has become a very hot research topic due to the potential application of optical needles in various fields, such as high-density optical data storage, super-resolution imaging, nanolithography, fluorescence imaging, particle capturing and so on [1][2][3][4][5][6][7][8][9][10][11]. By now, reversing electric dipole array radiation, vector beam wavefront modulation, paraxial spherical mirrors focusing and phase mask modulation were main methods for the generation of optical needles [12][13][14][15][16][17][18][19][20]. In addition, optical needles can be also generated by focusing radially polarized beams using a high-numerical aperture (NA) lens and diffractive optical elements (DOEs) with belts [1,16,[21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Complex phase filter could be regarded as an extension of the ternary phase-amplitude filter. This filter has recently been reported which can generate pure ultra-long optical needles by modulating the phase of polarized beam [14,15,20,[34][35][36]. Using the complex phase filter, Prabakaran et al obtained optical needle with 5.7λ of DOF and 1.4λ of FWHM by tightly focusing radially polarized BG beam in 2014 [34].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

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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“…For example radially polarized beam can generates multiple focal spots by used different types of pupil plane filters [8][9][10]. On the other hand, an azimuthally polarized beam can generates multiple focal holes in the focal plane by using different types of pupil filters [11][12][13][14]. Except some trivial cases, synthesis & optimization of most of these pupil filters are more complicated because it has diffraction problem in general [15,16].…”

Section: Introductionmentioning

confidence: 99%

Generation of axially splitted ultra-long multiple optical needles/optical tubes using generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter

Thiruarul¹,

Charles²,

Lavanya³

et al. 2022

Opt Quant Electron

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Based on vector diffraction theory and annular Walsh function filter, axially splitted ultra-long multiple optical needles/optical tubes of electric as well as magnetic field distributions are numerically generated by generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter. This multiple optical structures can be conveniently tailored by properly tuning the initial phase of the Cylindrical vector beam(CVB) and Walsh order of the annular Walsh function filter. Furthermore, the effect of energy flux density(Poynting vector) as well as Spin angular momentum(SAM) distribution in the focal region are theoretically analyzed. We expect that such an axially splitted focal systems could be applicable in optical trapping and manipulation of multiple particles, optical super resolution microscopy etc.

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“…Therefore, the potential and advantage of AP beams in generating optical needles have not been systematically analyzed and explored [26][27]. However, similar to RP beam, the AP beam also has perfect rotationally symmetric distribution, symmetric electric field distribution and special polarization distribution [28][29][30][31][32][33], making it possible to generate ultra-long optical needles with a sub-wavelength spot. Furthermore, there is a lack of systematic and theoretical analysis of this technology, whereas the mechanism and theoretical model need to be verified by experiments.…”

Section: Introductionmentioning

confidence: 99%

Generation of an Ultra-Long Optical Needle Induced by an Azimuthally Polarized Beam

Liu

Shi

et al. 2021

IEEE Photonics J.

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In this manuscript, a method of generating an ultra-long optical needle (depth-to-width ratio 37.5:1) is proposed and demonstrated by focusing an azimuthally polarized beam. In theory, the action mechanism between the incident beam and the amplitude modulation element, the spiral phase modulation element, the focusing lens were studied based on the Richards and Wolf's theory. The relationship between the intensity distribution of the optical needle and the structure parameter of the element were obtained, thus leading to the complete design model and design standard. In experiment, the annular amplitude modulation element and spiral phase modulation element were fabricated by lithography. The optical needle was obtained based on a custom-designed optical setup in our laboratory. The optical system consists of an annular aperture (3.9-mm inner diameter, 80-µm annular width), a spiral phase plate (topological charge of 1), and an objective lens with numerical aperture of 0.95. Finally, an optical needle with a subwavelength size (0.416λ) and an ultra-long depth of focus (15.6λ) was obtained, showing an excellent agreement with our theoretical model.

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Creation of super-length optical tube by phase modulated azimuthally polarized beam with multi-zone phase filter

Cited by 5 publications

References 21 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 axially splitted ultra-long multiple optical needles/optical tubes using generalized cylindrical vector Bessel Gaussian beam phase modulated by annular Walsh function filter

Generation of an Ultra-Long Optical Needle Induced by an Azimuthally Polarized Beam

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