Long-focal-depth cylindrical microlens with flat axial intensity distributions

Ye, Jiasheng; Mei, Guo-Ai; Xin, Zheng; Zhang, Yan

doi:10.1080/09500340.2011.631048

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…By way of illustration, the subwavelength focusing has been performed using planar plasmonic structures [1,2] or plasmonic lenses [3,4]. The tight focusing of laser light can also be achieved in the near-surface regions of conventional optical elements like a microaxicon [5], a ZP [6,7], a microlens [8], a solid immersion lens [9], and a conventional high NA lens [10][11][12][13]. The subwavelength focal spot can also be obtained on the tip of dielectric and metallic microcones [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the shape of a subwavelength focal spot for the linearly polarized light

et al. 2013

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By decomposing a linearly polarized light field in terms of plane waves, the elliptic intensity distribution across the focal spot is shown to be determined by the E-vector's longitudinal component. Considering that the Poynting vector's projection onto the optical axis (power flux) is independent of the E-vector's longitudinal component, the power flux cross section has a circular form. Using a near-field scanning optical microscope (NSOM) with a small-aperture metal tip, we show that a glass zone plate (ZP) having a focal length of one wavelength focuses a linearly polarized Gaussian beam into a weak ellipse with the Cartesian axis diameters FWHM(x)=(0.44±0.02)λ and FWHM(y)=(0.52±0.02)λ and the (depth of focus) DOF=(0.75±0.02)λ, where λ is the incident wavelength. The comparison of the experimental and simulation results suggests that NSOM with a hollow pyramidal aluminum-coated tip (with 70° apex and 100 nm diameter aperture) measures the transverse intensity, rather than the power flux or the total intensity. The conclusion that the small-aperture metal tip measures the transverse intensity can be inferred from the Bethe-Bouwkamp theory.

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Section: Introductionmentioning

confidence: 99%

Analysis of the shape of a subwavelength focal spot for the linearly polarized light

et al. 2013

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“…Quite recently, Ye et al have introduced apodized amplitude modulation into designs of the LFD cylindrical microlens and obtained a flat axial intensity profile [27]. In [27], the microlens boundary remains to be the same as that of the conventional microlens for focusing. The amplitude modulation is imposed on the incident light for implementing the LFD function.…”

Section: Introductionmentioning

confidence: 98%

Uniform axial intensity distributions of long-focal-depth cylindrical micromirrors realized by an amplitude-phase modulation method

Mei

et al. 2013

Journal of Modern Optics

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2013) Uniform axial intensity distributions of long-focal-depth cylindrical micromirrors realized by an amplitude-phase modulation method, Journal of Modern Optics, 60:9, 688-695, An amplitude-phase modulation method (APMM) is applied to realize the uniform long-focal-depth (LFD) function of metallic cylindrical focusing micromirrors (MCFMs). Based on rigorous electromagnetic theory and the boundary element method, focal properties of the designed MCFMs are characterized, which contain the actual focal depth, the focal spot size, the normalized encircled energy, the real focal length, and the axial intensity uniformity. On appropriately choosing the incident amplitude distribution with apodization, the designed MCFMs demonstrate the LFD properties with uniform intensity distributions. The superiority of the APMM to the pure phase modulation method is revealed in achieving a higher normalized encircled energy.

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Simple fabrication of high focal number micro-lenses based on a microfluid pulse jetting method

et al. 2018

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Long-focal-depth cylindrical microlens with flat axial intensity distributions

Cited by 4 publications

References 10 publications

Analysis of the shape of a subwavelength focal spot for the linearly polarized light

Analysis of the shape of a subwavelength focal spot for the linearly polarized light

Uniform axial intensity distributions of long-focal-depth cylindrical micromirrors realized by an amplitude-phase modulation method

Simple fabrication of high focal number micro-lenses based on a microfluid pulse jetting method

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