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Tight focusing properties of anomalous vortex beams
Optik, 2018Abstract Tight focusing properties of an anomalous vortex beam (AVB) passing through a high numerical aperture (NA) lens system are investigated, based on vector Debye integral. The numerical examples show that intensity distribution for the AVBs in focal region depend on the beam parameters including the topological charge m , the order of the AVBs
Mingyan Zhang, Yuanjie Yang
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Superfilamentation in water with tight focusing laser beams
CLEO: 2015, 2015We report whole life cycle of superfilament excited in tight focusing beams in water. Extreme energy delivery achieved under superfilamention is reflected in strong post-effects (cavitation bubbles and shock waves), which can completely characterize superfilament.
Fedor V. Potemkin +3 more
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Tight focusing of a nonhomogeneously polarized optical vortex
Saratov Fall Meeting 2017: Laser Physics and Photonics XVIII; and Computational Biophysics and Analysis of Biomedical Data IV, 2018In this work, we fabricated and studied the performance of a 100×100-μm four-sector binary subwavelength grating polarizer in a golden film. It was experimentally demonstrated that a linearly polarized 532-nm Gaussian beam reflected at the polarizer was converted to an azimuthally polarized beam.
Liam O'Faolain +4 more
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Ultrafast Excitation of Xenon in Tight and Loose Focusing Configurations
CLEO 2023, 2023We report the spectral signatures induced by ultrafast laser excitation of Xe. There is no significant difference in the number of observable Xe transitions regardless of the focusing condition, suggesting the possibility for filamentation-based remote sensing of Xe.
M. Burger +3 more
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Tight focusing of spirally polarized vortex beams
Optics & Laser Technology, 2010The tight focusing of spirally polarized focused vortex beams is analyzed numerically based on the vectorial Debye theory. The expressions for the electric field and the orbital angular momentum of focused beams are derived. It is shown that the intensity distribution in the focal plane is dependent on the specific spirally polarized state and the ...
Jixiong Pu, Zhiming Zhang
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Tight focusing cylindrical vector beams with fractional order
Journal of the Optical Society of America B, 2021By simulating tight focusing of vector beams with azimuthal polarization of fractional order 0 < m < 1 ( m = 1 is the azimuthal polarization; m = 0 is the linear polarization), it is shown that the shape of the intensity distribution in the focal spot changes from ...
S. S. Stafeev +3 more
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Tight focusing of partially coherent and circularly polarized vortex beams
Journal of the Optical Society of America A, 2009Based on the vectorial Debye theory, the tight focusing properties of partially coherent and circularly polarized vortex beams are investigated. The focused characteristics of right-circular and left-circular polarized partially coherent vortex beams in the focal region are presented and compared by some numerical calculation results.
Baosuan, Chen +2 more
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Tight Bounds on Localized Sensor Self-Deployment for Focused Coverage
2015 24th International Conference on Computer Communication and Networks (ICCCN), 2015We consider the self-deployment problem in mobile sensor networks with the objective of providing focused coverage for a point of interest (POI) such that the maximum area around it is covered by sensors without sensing holes. We present a local greedy algorithm, called TTGREEDY, that solves this problem in at most R + 2.(n-1) time steps, where R is ...
Gokarna Sharma, Hari Krishnan
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Tight focusing properties of a circular partially coherent Gaussian beam
Journal of the Optical Society of America A, 2018Tight focusing properties of a circular partially coherent Gaussian (CPCG) beam with linear polarization have been studied based on vectorial Debye theory. Expressions for the intensity distribution and degree of coherence near the focus are derived. Numerical calculations are performed to show the intensity distribution and degree of coherence of the ...
Huichuan Lin +5 more
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Tight focusing of a double-ring-shaped, azimuthally polarized beam
Optics Letters, 2011We study the focusing properties of a double-ring-shaped azimuthally polarized beam through an annular high NA objective lens. It is shown that a subwavelength focal hole (∼0.5λ) with a quite long depth of focus (∼26λ) is achieved near the focus. This kind of nondiffracting focal hole is called dark channel, which may have applications in atom optical ...
Bo, Tian, Jixiong, Pu
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