Design of DOE for generating a needle of a strong longitudinally polarized field

Huang, Kun; Shi, Peng; Kang, Xueliang; Zhang, Xiaobo; Li, Yongping

doi:10.1364/ol.35.000965

Cited by 132 publications

(53 citation statements)

References 16 publications

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“…The optical needle beam is such kind of focus featuring the narrow electromagnetic field distribution and the elongated longitudinal focal line. 3,4 Such kinds of needle beams are extremely valuable in various applications including the single-molecule fluorescence detection, particle transportation, and laser spectroscopy. However, the generation of needle focus relies on the fine regulation of ring-shaped corrugated phase masks.…”

Section: Introductionmentioning

confidence: 99%

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Fang

Ren

Gong

et al. 2015

Journal of Applied Physics

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Needle-like electromagnetic field has various advantages for the applications in high-resolution imaging, Raman spectroscopy, as well as long-distance optical transportation. The realization of such field often requires high numerical aperture (NA) objective lens and the transmission masks. We demonstrate an ultralong needle-like focus in the optical range produced with an ordinary lens. This is achieved by focusing a symmetric Airy beam (SAB) generated via binary spectral modulation with a digital micromirror device. Such amplitude modulation technique is able to shape traditional Airy beams, SABs, as well as the dynamic transition modes between the one-dimensional and two-dimensional (2D) symmetric Airy modes. The created 2D SAB was characterized through measurement of the propagating fields with one of the four main lobes blocked by an opaque mask. The 2D SAB was verified to exhibit self-healing property against propagation with the obstructed major lobe reconstructed after a certain distance. We further produced an elongated focal line by concentrating the SAB via lenses with different NAs and achieved an ultralong longitudinal needle focus. The produced long needle focus will be applied in optical, chemical, and biological sciences.

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Section: Introductionmentioning

confidence: 99%

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Fang

Ren

Gong

et al. 2015

Journal of Applied Physics

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“…Thus, in [9,10] by modeling based on Richards and Wolf formulas, a four-ring DOE matched to a lens with NA ¼ 0:95 was shown to form a focal segment of diameter FWHM ¼ 0:43λ and depth DOF ¼ 4λ. The DOE was illuminated with a radially polarized Bessel-Gaussian beam.…”

mentioning

confidence: 99%

“…In a number of papers [9][10][11][12], the focus depth was reported to be increased using axiconlike binary phase diffractive elements (DOEs) with their radius jumps fitted in a special manner. Thus, in [9,10] by modeling based on Richards and Wolf formulas, a four-ring DOE matched to a lens with NA ¼ 0:95 was shown to form a focal segment of diameter FWHM ¼ 0:43λ and depth DOF ¼ 4λ.…”

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confidence: 99%

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Tight focusing with a binary microaxicon

et al. 2011

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Using a near-field scanning microscope (NT-MDT) with a 100 nm aperture cantilever held 1 μm apart from a microaxicon of diameter 14 μm and period 800 nm, we measure a focal spot resulting from the illumination by a linearly polarized laser light of wavelength λ ¼ 532 nm, with its FWHM being equal to 0:58λ, and the depth of focus being 5:6λ. The rms deviation of the focal spot intensity from the calculated value is 6%. The focus intensity is five times larger than the maximal illumination beam intensity.

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“…For analytical calculations, it was convenient to use the middle radius of the ring. We understand that the radius of phase jump is additional parameter for optimization of the focal distribution; however, experience of other researchers [4,[6][7][8][19][20][21] shows that even a plenty of free parameters does not allow to reduce the focal spot simultaneously keeping energy. Therefore, we have decided to vary only the width of the ring with the middle -phase jump.…”

Section: Numerical Resultsmentioning

confidence: 98%

Sharper Focal Spot for a Radially Polarized Beam Using Ring Aperture with Phase Jump

Хонина

Ustinov

2013

Journal of Engineering

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We study analytically and numerically in which way the width of ring aperture containing a phase jump affects the size and intensity of the focal spot generated with a radially polarized beam. It is shown that by means of destructive interference of beams coming from the different-phase rings it becomes possible to overcome the scalar diffraction limit corresponding to the first zero of the zero-order Bessel function. The minimal focal spot size (FWHM = 0.33 ) is found to be attained when the annular aperture width amounts to 20% of the full-aperture radius. In this case, the side-lobe intensity is not larger than 30% of the central peak. A wider annular aperture with the phase jump introduced is also shown to form a focal spot not exceeding the diffraction limit for a narrow annular aperture, simultaneously providing a nearly six times higher intensity. In this case, the side lobes amount to 35% of the central peak.

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Design of DOE for generating a needle of a strong longitudinally polarized field

Cited by 132 publications

References 16 publications

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Shaping symmetric Airy beam through binary amplitude modulation for ultralong needle focus

Tight focusing with a binary microaxicon

Sharper Focal Spot for a Radially Polarized Beam Using Ring Aperture with Phase Jump

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