Sharper focal spot formed by higher-order radially polarized laser beams

Kozawa, Yuichi; Sato, Shunichi

doi:10.1364/josaa.24.001793

Cited by 215 publications

(82 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is entirely conceivable that even more complex waveguide geometries could lead to much higher mode stability, or the ability to generate and propagate even more complex vortex beams that are theoretically postulated [56] to facilitate spots as small as 0.14λ 2 .…”

Section: Mode-division Multiplexingmentioning

confidence: 99%

Optical vortices in fiber

Ramachandran

Kristensen²

2013

Nanophotonics

399

150

View full text Add to dashboard Cite

Optical vortex beams, possessing spatial polarization or phase singularities, have intriguing properties such as the ability to yield super-resolved spots under focussing, and the ability to carry orbital angular momentum that can impart torque to objects. In this review, we discuss the means by which optical fibers, hitherto considered unsuitable for stably supporting optical vortices, may be used to generate and propagate such exotic beams. We discuss the multitude of applications in which a new class of fibers that stably supports vortices may be used, and review recent experiments and demonstration conducted with such fibers.

show abstract

Section: Mode-division Multiplexingmentioning

confidence: 99%

Optical vortices in fiber

Ramachandran

Kristensen²

2013

Nanophotonics

399

150

View full text Add to dashboard Cite

show abstract

“…Nowadays, highly focused beams are present in numerous research areas and technical applications [1][2][3][4][5][6][7][8][9][10]. However, to the best of our knowledge no research has been reported in the field of optical security [11][12][13], using focused fields.…”

Section: Introductionmentioning

confidence: 99%

Optical encryption in the longitudinal domain of focused fields

et al. 2016

View full text Add to dashboard Cite

Abstract:We develop a method for encoding information in the longitudinal component of a focused field. Focused beams display a nonzero contribution of the electric field in the direction of propagation. However, the associated irradiance is very weak and difficult to isolate from the transverse part of the beam. For these reasons, the longitudinal component of a focused field could be a good choice for encoding and securing information. Using the Richards and Wolf formalism we show how to encrypt information in the longitudinal domain of the focal area. In addition, we use quantum imaging techniques to enhance the security and to prevent unauthorized access to the information. To the best of our knowledge, this is the first report on using the longitudinal component of the focused fields in optical security.

show abstract

“…The propagation of electromagnetic field distributions generated at the focal region has been extensively investigated in the last years [1][2][3][4][5][6][7][8]. Non-paraxial fields have demonstrated very useful in many fields for instance in high-resolution microscopy, particle trapping, high-density recording, tomography, electron acceleration, nonlinear optics, and optical tweezers [9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of highly focused fields with circular polarization at any transverse plane

Maluenda¹,

Martı́nez-Herrero²,

Juvells³

et al. 2014

Opt. Express

View full text Add to dashboard Cite

Abstract:We develop a method for generating focused vector beams with circular polarization at any transverse plane. Based on the Richards-Wolf vector model, we derive analytical expressions to describe the propagation of these set of beams near the focal area. Since the polarization and the amplitude of the input beam are not uniform, an interferometric system capable of generating spatially-variant polarized beams has to be used. In particular, this wavefront is manipulated by means of spatial light modulators displaying computer generated holograms and subsequently focused using a high numerical aperture objective lens. Experimental results using a NA = 0.85 system are provided: irradiance and Stokes images of the focused field at different planes near the focal plane are presented and compared with those obtained by numerical simulation.

show abstract

Sharper focal spot formed by higher-order radially polarized laser beams

Cited by 215 publications

References 19 publications

Optical vortices in fiber

Optical vortices in fiber

Optical encryption in the longitudinal domain of focused fields

Synthesis of highly focused fields with circular polarization at any transverse plane

Contact Info

Product

Resources

About