2017
DOI: 10.1364/josab.34.000909
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Optical vortex with a small core and Gaussian intensity envelope for light-matter interaction

Abstract: Optical vortices with a vortex core size that is at least two orders of magnitude smaller than the laser beam waist is presented. The optical vortex is generated by a spiral phase plate (SPP) and counter-rotating optical vortex pairs are created in a modified Mach-Zehnder interferometer surrounded by a 4 f lens arrangement. The azimuthal variation of the counter-rotating optical vortex forms a sinusoidal intensity modulation for which the winding number of the optical vortex is deduced accurately and precisely… Show more

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Cited by 12 publications
(3 citation statements)
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“…As we can see that the Raman coupling �(r) and two-photon detuning δ serve as effective transverse and longitudinal Zeeman fields, respectively, which play crucial roles in stabilizing vortices. Different from the LG Raman beams used in previous experiments [53,55], Chen et al propose Raman coupling as �(r) = � 0 e −2r 2 /w 2 [66], with 0 the peak intensity and w the beam waist, which can be experimentally realized [120]. Such a choice of the Raman beams is mainly on the basis that the LG Raman beams used in current experiments are suppressed over a considerable region near r = 0 , giving rise to an almost vanishing spin mixing effect in the vicinity, which is unfavorable for vortex formation essentially.…”
Section: Soam-coupling-induced Vortex Statesmentioning
confidence: 99%
“…As we can see that the Raman coupling �(r) and two-photon detuning δ serve as effective transverse and longitudinal Zeeman fields, respectively, which play crucial roles in stabilizing vortices. Different from the LG Raman beams used in previous experiments [53,55], Chen et al propose Raman coupling as �(r) = � 0 e −2r 2 /w 2 [66], with 0 the peak intensity and w the beam waist, which can be experimentally realized [120]. Such a choice of the Raman beams is mainly on the basis that the LG Raman beams used in current experiments are suppressed over a considerable region near r = 0 , giving rise to an almost vanishing spin mixing effect in the vicinity, which is unfavorable for vortex formation essentially.…”
Section: Soam-coupling-induced Vortex Statesmentioning
confidence: 99%
“…S1, phase patterns e +ilθ and e −ilθ are imprinted by a q-plate respectively on the input pair of Gaussian beams with different circular polarizations. Subsequently, a 4f -lens system is employed to image the Gaussian intensity profile immediately after the q-late onto the atoms [32]. Unlike the situations in previous works [26,27], here we use the beam profile right after the q-plate and do not allow it to further propagate into the diffraction far field, thus avoiding the Laguerre function and the factor |r| l to appear in the intensity profile.…”
Section: Experimental Implementationmentioning
confidence: 99%
“…Using smaller wavelength light will allow focusing that generates a much smaller beam waist, on the scale of λ. X-ray optical vortices have been studied and shown to produce circular-vortex-dichroic absorption signals in cysteine molecules with respect to the sign of ℓ that are larger than standard circular dichroism with circularly polarized photons [67]. Furthermore, optical vortices with large beam waists have been generated [68] which possess an intensity pattern with a Gaussian envelope and a point singularity at the centre, leading to vortex core size to beam waist ratios of w VC /w 0 ≈ 0.02. Another route, which has already been utilized to observe optical activity of twisted light [44], is the use of plasmonic enhancements of metallic nanoparticles to enhance the coupling between chiral molecules and optical vortex light [69].…”
Section: Optical Tensors Labelmentioning
confidence: 99%