Generation of Multiple Focal Hole Segments Using Double-Ring Shaped Azimuthally Polarized Beam

Lalithambigai, K.; Saraswathi, R.; Anbarasan, P. M.; Rajesh, K. B.; Jaroszewicz, Zbigniew

doi:10.1155/2013/451715

Cited by 9 publications

(7 citation statements)

References 19 publications

(19 reference statements)

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“…Here, for easy calculations, we presume that the refractive index n = 1, M(θ ) = 1, β = 1.2 and A = 1. Generally a double-ring-shaped azimuthally polarized beam without any phase modulation is tightly focused, a single-ring focal hole pattern is obtained (Lalithambigai et al 2013). It is reported that using SPM with a high NA lens one can generate a single transversely polarized bright focal spot (Yuan et al 2011).…”

Section: Resultsmentioning

confidence: 99%

“…A "hollow dark channel" with a long focal depth was more recently achieved by tight focusing of a double-ring-shaped azimuthally polarized beam with additional high NA lens axicon system (Lalithambigai et al 2012). Multiple ring structure is also obtained by using azimuthally polarized beam with multibelt phase filter and high NA lens system, recently (Lalithambigai et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Creation of super-long bright channel using high NA lens axicon with dedicated multibelt binary phase mask

Lalithambigai

Anbarasan

Rajesh³

2014

Opt Quant Electron

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We provide a theoretical approach to use a multibelt binary phase mask in combination with a high numerical aperture lens axicon to achieve a subwavelength focal spot with large uniform focal depth when illuminated by an azimuthally polarized Laguerre-Gaussian beam. The intensity distributions are derived and evaluated based on the vector diffraction theory. Here we report a new method that generates a transversely polarized light beam with sub diffraction beam size (0.384 λ) that propagates without divergence over a long distance (of about 14 λ) in free space. The author expect such investigation is worthwhile for the applications of the optical manipulation, optical microscopy and optical micromachining.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Creation of super-long bright channel using high NA lens axicon with dedicated multibelt binary phase mask

Lalithambigai

Anbarasan

Rajesh³

2014

Opt Quant Electron

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“…J 1 ðxÞ is a symbol of the Bessel functions of the first kind and AðhÞ signifies the amplitude and phase distribution at the exit pupil. For an incident A-TEM p1 * beam, AðhÞ can be expressed as [18,19]:…”

Section: Theorymentioning

confidence: 99%

Study on higher order azimuthally polarized Laguerre–Gaussian mode beams with high NA lens

Lalithambigai

Anbarasan

Rajesh³

2014

J Theor Appl Phys

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The intensity distributions near the focal point for tight focusing of azimuthally polarized Laguerre-Gaussian beam including higher order modes are calculated based on vector diffraction theory. For higher order as well as the fundamental lower order mode A-TEM 01 *, a small focal hole at the centre is obtained for the focusing under high NA lens. In a limit of NA = 0.95, the higher order A-TEM p1 * mode beams of p = 1, 2, 3, 4, 5 and 6 are established numerically in detail. It is observed that one of the higher order mode A-TEM 51 * generates some interesting results. And it is also observed that the intensity distribution of the different mode has little variation among the degree of truncation (b) of the input beam beside the pupil. This work is important for optical manipulation, optical data storage, micro-machines and optical trapping applications for low refractive index particles.

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“…For example, radially polarized higher-order modes allow one to reduce the focal spot size [3,4] and thus to achieve super-resolution. Doublering structures with radial [5,6] or azimuthal [7] polarizations may exhibit advantages for optical trapping and manipulation. We propose to change the intensity ratio of the rings in order to optimize the strength of trapping and retention of transparent and opaque particles, and thus to perform their sorting.…”

Section: Introductionmentioning

confidence: 99%

Generation of a controlled double-ring-shaped radially polarized spiral laser beam using a combination of a binary axicon with an interference polarizer

Карпеев

Паранин

Хонина

2017

J. Opt.

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A new optical system is proposed for the generation of radially polarized spiral laser beams in the form of a controlled narrow double ring. The system is based on the conversion of conical wavefronts passing through an interference polarizing plate. A double conical wavefront is formed by a diffractive axicon and the obtained nonuniformly polarized beam is collimated by a refractive axicon. During the beam formation the amplitude distribution can be controlled by the redistribution of energy between the diffraction orders due to a modification of the profile of the diffractive element zones. A double-ring-shaped radially polarized beam is experimentally obtained with the help of a binary phase axicon.

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Generation of Multiple Focal Hole Segments Using Double-Ring Shaped Azimuthally Polarized Beam

Cited by 9 publications

References 19 publications

Creation of super-long bright channel using high NA lens axicon with dedicated multibelt binary phase mask

Creation of super-long bright channel using high NA lens axicon with dedicated multibelt binary phase mask

Study on higher order azimuthally polarized Laguerre–Gaussian mode beams with high NA lens

Generation of a controlled double-ring-shaped radially polarized spiral laser beam using a combination of a binary axicon with an interference polarizer

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