High-aperture binary axicons for the formation of the longitudinal electric field component on the optical axis for linear and circular polarizations of the illuminating beam

Хонина, С. Н.; Savelyev, Dmitry

doi:10.1134/s1063776113120157

Cited by 56 publications

(24 citation statements)

References 9 publications

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“…A remarkable fact was discovered in the course of studies on sharp focusing. It was the possibility to overcome the diffraction limit in the near field zone using the axicons with subwavelength period [68][69][70][71][72][73]. The generation of the longitudinal component of electromagnetic field on the optical axis in the focal region while entering into the beam with linear and circular polarization of the vortex phase in conditions of sharp focusing was theoretically shown.…”

Section: Ipsi Rasmentioning

confidence: 99%

“…To implement best focus conditions it is necessary not only to increase the numerical aperture of the focusing system [71,[74][75][76], but also to provide a definite combination of polarization and spatial properties of the focused beams. Most existing lasers emit a linearly polarized light, but the most interesting results were found when radiation with radial and azimuthal polarization is focused.…”

Section: Ipsi Rasmentioning

confidence: 99%

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For the anniversary of professor S.N. Khonina

Kolomiets

2016

Proceedings of International Conference Information Technology and Nanotechnology (ITNT-2016)

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Section: Ipsi Rasmentioning

confidence: 99%

Section: Ipsi Rasmentioning

confidence: 99%

For the anniversary of professor S.N. Khonina

Kolomiets

2016

Proceedings of International Conference Information Technology and Nanotechnology (ITNT-2016)

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Section: Introductionmentioning

confidence: 99%

“…The lightning-rod effect lies in the fact that longitudinal electric field component are enhanced near sharp structures. It can be observed, for example, in cases where radially polarized beams [17][18][19] or linearly polarized beams [20][21][22] are focused.The dielectric characteristics of axicons can be approximately estimated with ray and scalar optical theory [23,24], and then defined more accurately with more rigorous methods. …”

mentioning

confidence: 99%

Diffraction by an axicon with taking into consideration multiple internal reflections

Degtyarev¹,

Ustinov²,

Хонина³

2015

Collection of Selected Papers of the I International Conference on Information Technology and Nanotechnology

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Abstract. In this work we consider laser beam diffraction by narrow elongated axicon with conical angle, which is small enough for multiple internal reflection arising. Those sorts of tapers are widely used in micro and nanooptics. We have to take into account more than one internal reflection for correct description of beam propagation through the axicon. The diffraction is simulated with two approaches: pure "geometrical optics" and Helmholtz equation solving with "Finite Elements Method". Based on ray optics we derive analytic formulas for conical angles meanings, which provide maximums and minimums of intensity on optical axis. Derived numerical simulation verifies theoretically obtained results. IntroductionAxicons [1, 2] can be used to create nondiffraction Bessel beams in classical Optics [3,4]. Metalized axicons with small cone angles are also utilised as near-field probes and tapers for sharp focusing in Nanophotonics [5,6] and especially in nearfield microscopy [7-9] and spectroscopy [10]. To determine the optimum parameters of such tapers we need to provide simulation in accordance with the assumptions of the rigorous vectorial diffraction theory [11][12][13][14].Working of metal conical structure is explained by the lightning-rod effect [15] which can be observed near dielectric structures [16]. The lightning-rod effect lies in the fact that longitudinal electric field component are enhanced near sharp structures. It can be observed, for example, in cases where radially polarized beams [17][18][19] or linearly polarized beams [20][21][22] are focused.The dielectric characteristics of axicons can be approximately estimated with ray and scalar optical theory [23,24], and then defined more accurately with more rigorous methods.

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“…Distribution and generation of free-space laser vortices studied quite well [15][16][17][18], in [19][20][21] shows how to use them to focus the simple micro-elements of square and cylindrical shape. However, obtaining an optical fiber separate vortex modes and their superpositions is a big problem [14,[22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%