Characteristics of sharp focusing of vortex Laguerre-Gaussian beams

Abstract

Исследуется пространственное распределение интенсивности остросфокусированного пучка Гаусса-Лагерра в зависимости от состояния однородной (линейной и круговой) поляризации и порядка вихревой фазы. Показано, что наибольшее влияние состояние поляризации оказывает на продольную компоненту электрического вектора светового поля. Наибольшее визуальное различие в картине общей интенсивности в зависимости от поляризации наблюдается при использовании вихревой фазы первого порядка. Использование аксикона позволяет усилить фокусировку по сравнению с апланатическим объективом. Ключевые слова: острая фокусировка, пучки Гаусса-Лагерра, оптические вихри, аксикон. Цитирование: Савельев, Д.А. Особенности острой фокусировки вихревых пучков Гаусса

Near-Field Vortex Beams Diffraction on Surface Micro-Defects and Diffractive Axicons for Polarization State Recognition

“…It was shown earlier [ 26 , 29 ] that the addition of an optical vortex significantly changes the focal pattern, and the direction of rotation of circular polarization becomes important. At the second order of the optical vortex, and higher for “−”, circular polarization (the sign of circular polarization is opposite to the sign of the introduced vortex phase singularity), a shadow round light spot was formed.…”

“…The introduction of a vortex phase singularity into the incident beam makes it possible to enhance the longitudinal component of uniformly polarized laser beams on the optical axis in the focal region [ 26 ], which makes it possible to change the diffraction pattern due to the redistribution of energy between the components of the electromagnetic field [ 27 , 28 , 29 ]. This possibility was experimentally confirmed in [ 30 ].…”

Design and modeling of a photonic integrated device for optical vortex generation in a silicon waveguide

“…Besides, the phase of optical vortices is used for the polarizing properties analysis of laser fields. Features of sharp focusing of Gaussian-Laguerre vortex laser beams for various types of uniform polarization depending on the order of the vortex phase is considered in [6]. The detection of the polarization state, as well as the relationship between phase and polarization features in optical systems with a high numerical aperture, are presented in [7,8].…”

Optical Vortices Sharp Focusing by Silicon Ring Gratings Using High-Performance Computer Systems

“…The introduction of vortex phase singularity into the incident beam makes it possible to enhance the longitudinal component of homogeneous-polarized laser beams on the optical axis in the focal region [18]. So, it which makes it possible to change the diffraction pattern due to the redistribution of energy between the components of the electromagnetic field [19,20]. This was shown earlier for focusing elements with a refractive index n = 1.46 [19,20], but an increase in the contribution of the longitudinal component to the overall intensity pattern on the optical axis can be achieved [18] with an increasing of the refractive index.…”