Toward a spherical spot distribution with 4π focusing of radially polarized light

Bokor, Nándor; Davidson, Nir

doi:10.1364/ol.29.001968

Cited by 94 publications

(47 citation statements)

References 14 publications

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“…It corresponds to the case where an RPLB is focused uniformly over 4π steradians [37,38]. In an ideal setup, the inward and outward energy flows would then be perfectly balanced, resulting in a null Poynting vector.…”

Section: Radially Polarized Laser Beamsmentioning

confidence: 99%

Direct Electron Acceleration with Radially Polarized Laser Beams

et al. 2013

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In the past years, there has been a growing interest in innovative applications of radially polarized laser beams. Among them, the particular field of laser-driven electron acceleration has received much attention. Recent developments in high-power infrared laser sources at the INRS Advanced Laser Light Source (Varennes, Qc, Canada) allowed the experimental observation of a quasi-monoenergetic 23-keV electron beam produced by a radially polarized laser pulse tightly focused into a low density gas. Theoretical analyses suggest that the production of collimated attosecond electron pulses is within reach of the actual technology. Such an ultrashort electron pulse source would be a unique tool for fundamental and applied research. In this paper, we propose an overview of this emerging topic and expose some of the challenges to meet in the future.

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Section: Radially Polarized Laser Beamsmentioning

confidence: 99%

Direct Electron Acceleration with Radially Polarized Laser Beams

et al. 2013

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“…Lately, their initial results have been extended to radially polarized beams and azimuthally polarized beams [2]. The methodology proposed in these works has been widely used to analyze different situations, such as light focusing on a tighter spot [3], 4π focusing systems [4][5][6], and focusing properties of vortex beams emitted by photonic crystal lasers [7], as well as the control of electric field components by using binary phase distributions [8]. In this paper, we propose an alternative methodology that generalizes that which has been previously reported to analyze any focusing optical device for any polarization state.…”

Section: Introductionmentioning

confidence: 99%

Diffraction of convergent spherical waves with all possible polarization states using the Luneburg integral method

2013

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We present a complete electromagnetic study, which includes electric, magnetic, and Poynting vector fields of diffracted convergent spherical waves under all possible polarization states compatible with Maxwell's equations. Exit pupil boundary conditions for these polarizations were obtained by means of Hertz potentials. Using these boundary conditions, two-dimensional Luneburg diffraction integrals for the three components of electric and magnetic fields were formulated, and after some approximations, we showed that the complete electromagnetic description of the inhomogeneous polarization states of spherical waves is reduced to the knowledge of seven one-dimensional integrals. The consistency of the method was tested by comparison with other previously reported methods for linearly polarized (LP), TE, and TM polarizations, while the versatility of the method was showed with the study of nonstandard polarization states, for example, that resulting from the superposition of TE and TM dephased spherical waves, which shows a helicoidal behavior of the Poynting vector at the focalization region, or the inhomogeneous LP state that exhibits a ring structure for the Poynting vector at the focal plane.

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“…Compared with the singlelens focusing configuration, the number of the incident beams will increase, and the effect of multiple-beam interference will become more obvious. However, most of the previous 4π focusing systems considered only the doughnut RP beam [17][18][19], while the higher-order LG RP modes had never been investigated until now.We show the 4π focusing system, which consists of two high NA objectives illuminated by two higher-order LG RP beams in Fig. 1, with the instantaneous electric field vector represented by the short arrows.…”

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confidence: 99%

“…The β values are selected to be 1.271, 2.031, 2.935, and 3.595 for the R-TEM 01 , R-TEM 11 , R-TEM 31 , and R-TEM 51 mode beams, respectively, which are investigated in this Letter. In order to achieve the perfect destruction interference of the radial component in the focus plane, so as to reduce the focal spot size while enhancing its longitudinal component intensity at the same time, two counter-propagating higher-order LG RP beams must have an opposite phase [17,19], as shown in Fig. 1.…”

mentioning

confidence: 99%

“…It can be clearly seen that the focal spots formed by higher-order LG RP beams in the 4π focusing system possess a smaller size as well as higher intensity; besides, these advantages become overwhelming in the increasing order of the LG RP beam. The elongation of the longitudinal component or the total electric field along the optical axis can be diminished to some extent as well in the 4π focusing system, which can improve the axial resolution [17].…”

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confidence: 99%

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Sharper focal spot generated by 4π tight focusing of higher-order Laguerre–Gaussian radially polarized beam

2013

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The focal electric fields for a 4π high numerical aperture (NA) focusing system with both the doughnut and higher-order Laguerre-Gaussian (LG) radially polarized (RP) beams are investigated in the case of NA=1, and the full width at half-maximum values of the focal spots are calculated. Compared with the single-lens high NA focusing configuration, a sharper spot, whose size is reduced efficiently in the transverse as well as the axial direction, can be formed. Such size reduction is attributed to not only the destruction interference of the longitudinal component caused by the π phase shift between any two adjacent rings of the incident higher-order LG RP beam coming from one particular direction but also the perfect destruction interference of the radial component formed by the two counter-propagating incident beams.

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Toward a spherical spot distribution with 4π focusing of radially polarized light

Cited by 94 publications

References 14 publications

Direct Electron Acceleration with Radially Polarized Laser Beams

Direct Electron Acceleration with Radially Polarized Laser Beams

Diffraction of convergent spherical waves with all possible polarization states using the Luneburg integral method

Sharper focal spot generated by 4π tight focusing of higher-order Laguerre–Gaussian radially polarized beam

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