A modular spiral phase plate design for orbital angular momentum generation at millimetre wavelengths [PDF]
, 2014 Proof of concept measurements of a modular spiral phase plate design able to generate millimetre wavelength beams with an azimuthal mode number of l = ±10 are presented.
Maffei, Bruno +2 more
core +12 more sources
A New Etalon Geometry: The Spiral Phase Plate Etalon. [PDF]
, 2012 This dissertation reports on theory, simulations, and experiments that extend the conventional Fabry-Perot etalon to a new geometry, namely the spiral phase plate etalon.
Rumala, Yisa S.
core +7 more sources
Dynamic multilevel spiral phase plate generator. [PDF]
Sci Rep, 2018 The design and characterisation of a reconfgurable multi-level spiral phase plate is shown. The device is based on a pie-shape liquid-crystal structure with 24 slices driven by custom electronics that allow independent excitation control of each ...
Caño-García M +3 more
europepmc +2 more sources
Edge detection by spiral phase contrast imaging at terahertz frequencies
Electronics Letters, 2021 This paper proposes the spiral phase contrast (SPC) imaging at terahertz (THz) frequencies to achieve the target edge detection. The THz SPC imaging is built based on a classical 4f imaging system, and a spiral phase plate is placed in the Fourier plane ...
Hui Liu +5 more
doaj +1 more source
Modeling of the optical vortex generation using a silver spiral zone plate [PDF]
Компьютерная оптика, 2018 Using a FDTD-method implemented in the FullWAVE (RSoft) software, a process of generating optical vortices during the propagation of a left- or right-hand circularly polarized Gaussian pulse through a phase and amplitude spiral zone plate with ...
Elena Kozlova
doaj +1 more source
Generation of an Ultra-Long Optical Needle Induced by an Azimuthally Polarized Beam
IEEE Photonics Journal, 2021 In this manuscript, a method of generating an ultra-long optical needle (depth-to-width ratio 37.5:1) is proposed and demonstrated by focusing an azimuthally polarized beam.
Liwei Liu +8 more
doaj +1 more source
Sharp focus of a circularly polarized optical vortex at the output of a metalens illuminated by linearly polarized light [PDF]
Компьютерная оптика, 2019 A three-level spiral metalens in an amorphous silicon film is designed. The metalens relief consists of two subwavelength gratings with a 220-nm period (for 633 nm wavelength) and depths of 90 and 170 nm. The metalens forms a left-hand circular polarized
Anton Nalimov, Victor Kotlyar
doaj +1 more source
Multilevel Spiral Axicon for High-Order Bessel–Gauss Beams Generation
Nanomaterials, 2023 This paper presents an efficient method to generate high-order Bessel–Gauss beams carrying orbital angular momentum (OAM) by using a thin and compact optical element such as a multilevel spiral axicon.
Rebeca Tudor +6 more
doaj +1 more source
Numerical Simulation and Experimental Study of a Multistage Multiphase Separation System
Separations, 2022 Nowadays, most oilfields have entered the high water cut stage of waterflood development. The importance of oil–water separation technology becomes more obvious. Gravity separation is one of the most commonly used treatment techniques for produced fluid.
Xuezhong Chen +5 more
doaj +1 more source
High-speed format 1000BASE-SX / LX transmission through the atmosphere by vortex beams near IR range with help modified SFP-transmers DEM-310GT [PDF]
Компьютерная оптика, 2020 The possibility of constructing a near-infrared atmospheric optical communication system based on a pair of media converters of a signal format 100Base-TX / 1000BASE-T to format 1000BASE-SX / LX with SFP transceivers DEM-310GT was experimentally ...
S.V. Karpeev +3 more
doaj +1 more source