Generating sub wavelength pure longitudinal magnetization probe and chain using complex phase plate

Udhayakumar, M.; Prabakaran, K.; Rajesh, K. B.; Jaroszewicz, Zbigniew; Belafhal, A.

doi:10.1016/j.optcom.2017.09.007

Cited by 17 publications

(7 citation statements)

References 52 publications

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“…4 1 6 λ 12λ 4pi method [36] 0 . 4 4 λ 16λ Azimuthally polarized annular multi Gaussian [42] 0 . 28 6 λ 35λ Azimuthally polarized DG beam [59] 0 .…”

Section: Resultsmentioning

confidence: 99%

“…However, such a multi-zone plate phase filter is difficult to produce because of its complex phase transmittance from the point of view of the filter structure, and the performance of the complex phase filters are superior compared to other types of filter [41]. Recently we demonstrated the possibility of generating a sub-wavelength (0.286λ) super-long (35λ) magnetic needle and magnetic chain with multiple spherical longitudinal spots using an azimuthally polarized multi Gaussian vortex beam phase modulated by a specially designed complex phase filter and focused with high NA objective [42]. In this paper, we theoretically proposed a simple and novel method to generate a sub-wavelength super-long longitudinal magnetization needle and a spherical magnetization chain in the focal volume of the objective by focusing an azimuthally polarized Bessel-Gauss vortex (APBGV) beam phase modulated by a specially designed complex phase filter.…”

Section: Introductionmentioning

confidence: 99%

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Manipulating the magnetization focal patterns using complex phase filters

Udhayakumar¹,

Prabakaran²,

Rajesh³

et al. 2019

Optica Applicata

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Based on vector diffraction theory and inverse Faraday effect, the light induced magnetization distribution of a tightly focused azimuthally polarized Bessel-Gauss beam superimposed with a helical phase and modulated by an optimized multi belt complex phase filter (MBCPF) is analyzed numerically. It is noted that by adjusting the radii of different rings of the complex phase filter, one can achieve many novel magnetization focal distributions, such as sub-wavelength scale (0.29λ) and super-long (71λ) pure longitudinal magnetic probe and magnetization chain composed of nine, six and four magnetic spots of sub-wavelength scale. The authors expect that these results pave the path for fabricating magnetic lattices for spin wave operation, multiple atoms or magnetic particle trapping and transportation, confocal and magnetic resonance microscopy, as well as multilayer ultrahigh density magnetic storage.Keywords: inverse Faraday effect, high NA lens, multi belt complex phase filter, azimuthally polarized Bessel-Gauss beam.

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“…4 1 6 λ 12λ 4pi method [36] 0 . 4 4 λ 16λ Azimuthally polarized annular multi Gaussian [42] 0 . 28 6 λ 35λ Azimuthally polarized DG beam [59] 0 .…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Manipulating the magnetization focal patterns using complex phase filters

Udhayakumar¹,

Prabakaran²,

Rajesh³

et al. 2019

Optica Applicata

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“…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%

“…In this work, a multi-belts complex phase filter (MBCPF) was optimized based on above reports [34][35][36]. A longitudinally polarized optical needle was obtained with the optimized MBCPF by tightly focusing radial polarized sinh-Gaussian beam in a single lens system.…”

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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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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“…The first work in which a subwavelength focal spot was experimentally obtained using radially polarized light was carried out in 2003 [ 6 ]. By carefully selecting the polarization of the focused light, it is possible to create compact focal spots [ 6 , 7 ], optical needles [ 8 , 9 , 10 , 11 ], light tunnels [ 12 , 13 ], optical chains [ 14 , 15 , 16 , 17 ], foci with a flat apex [ 18 , 19 , 20 ], lattice-like optical structures [ 21 ], magnetization spots and chains [ 22 , 23 , 24 , 25 ], polarization knots [ 26 ], Möbius strips [ 27 ], and the Hilbert hotel phenomenon [ 28 ], among other effects.…”

Section: Introductionmentioning

confidence: 99%

Minimal Focal Spot Size Measured Based on Intensity and Power Flow

Kotlyar

Stafeev

Zaitsev

2021

Sensors

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It is shown, theoretically and numerically, that the distributions of the longitudinal energy flow for tightly focused light with circular and linear polarization are the same, and that the spot has circular symmetry. It is also shown that the longitudinal energy flows are equal for optical vortices with unit topological charge and with radial or azimuthal polarization. The focal spot has a minimum diameter (all other characteristics being equal), which is measured based on the intensity of an optical vortex with azimuthal polarization. The diameter of the focal spot calculated from the energy flow for light with circular or linear polarization is slightly larger (by a fraction of a percentage). The magnitude of the diameter based on the intensity plays a role in the interaction of light with matter, and the magnitude of the diameter based on the energy flux affects the resolution in optical microscopy which is crucial in sensorial applications.

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Generating sub wavelength pure longitudinal magnetization probe and chain using complex phase plate

Cited by 17 publications

References 52 publications

Manipulating the magnetization focal patterns using complex phase filters

Manipulating the magnetization focal patterns using complex phase filters

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

Minimal Focal Spot Size Measured Based on Intensity and Power Flow

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