scholarly journals Generation of linearly polarized orbital angular momentum modes in a side-hole ring fiber with tunable topology numbers

2016 ◽  
Vol 24 (15) ◽  
pp. 17272 ◽  
Author(s):  
Ya Han ◽  
Yan-Ge Liu ◽  
Wei Huang ◽  
Zhi Wang ◽  
Jun-Qi Guo ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Side Hole ◽  
Linearly Polarized

scholarly journals Trapping and rotation of microparticles using a metasurface exciting by linearly polarized beam

2021 ◽  
Vol 11 ◽  
pp. 184798042110151
Author(s):  
Yi Yang ◽  
Siyuan Huang
Keyword(s):  
Angular Momentum ◽  
Surface Plasmon ◽  
Orbital Angular Momentum ◽  
Surface Plasmon Polariton ◽  
Polarized Beams ◽  
Archimedes Spiral ◽  
Clockwise Direction ◽  
Polarized Beam ◽  
Linearly Polarized ◽  
Plasmon Polariton

We numerically demonstrate trapping and rotation of particles using a metasurface formed by arranging nanocavities as a right-handed Archimedes’ spiral. Excited by a 90° linearly polarized beam, a focused surface plasmon polariton (SPP) field is formed at the center of the spiral, and the particle can be trapped by the field. While excited by −45° linearly polarized beams, a vortex SPP field carrying orbital angular momentum is formed, and the particles can be trapped and rotated in the clockwise direction at the vortex field.

scholarly journals Vortex energy flow in the tight focus of a non-vortex field with circular polarization

2020 ◽  
Vol 44 (1) ◽  
pp. 5-11
Author(s):  
V.V. Kotlyar ◽  
S.S. Stafeev ◽  
A.G. Nalimov
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Energy Flow ◽  
Poynting Vector ◽  
Focal Spot ◽  
Free Field ◽  
Longitudinal Component ◽  
Circularly Polarized ◽  
Linearly Polarized ◽  
Direct Energy

Using Richards-Wolf formulas, we show that an axisymmetric circularly polarized vortex-free field can be focused into a sharp subwavelength focal spot, around which there is a region where the light energy flow propagates along a spiral. This effect can be explained by the conversion of the spin angular momentum of the circularly polarized field into the orbital angular momentum near the focus, although the on-axis orbital angular momentum remains zero. It is also shown that a linearly polarized optical vortex with topological charge 2 forms near the focal plane an on-axis reverse energy flow (defined by the negative longitudinal component of the Poynting vector) whose amplitude is comparable with the direct energy flow.

scholarly journals A Review of Tunable Orbital Angular Momentum Modes in Fiber: Principle and Generation

2019 ◽  
Vol 9 (12) ◽  
pp. 2408 ◽  
Author(s):  
Lipeng Feng ◽  
Yan Li ◽  
Sihan Wu ◽  
Wei Li ◽  
Jifang Qiu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Rotation Speed ◽  
Degree Of Freedom ◽  
Particle Rotation ◽  
Large Capacity ◽  
Linearly Polarized ◽  
Basic Concepts ◽  
Polarization States ◽  
Linearly Polarized Modes

Orbital angular momentum (OAM) beams, a new fundamental degree of freedom, have excited a great diversity of interest due to a variety of emerging applications. The scalability of OAM has always been a topic of discussion because it plays an important role in many applications, such as expanding to large capacity and adjusting the trapped particle rotation speed. Thus, the generation of arbitrary tunable OAM mode has been paid increasing attention. In this paper, the basic concepts of classical OAM modes are introduced firstly. Then, the tunable OAM modes are categorized into three types according to the orbital angular momentums and polarization states of mode carrying. In order to understand the OAM evolution of a mode intuitively, three kinds of Poincaré spheres (PSs) are introduced to represent the three kinds of tunable OAM modes. Numerous methods generating tunable OAM modes can be roughly divided into two types: spatial and fiber-based generation methods. The principles of fiber-based generation methods are interpreted by introducing two mode bases (linearly-polarized modes and vector modes) of the fiber. Finally, the strengths and weaknesses of each generation method are pointed out and the key challenges for tunable OAM modes are discussed.

scholarly journals Generating Different Polarized Multiple Vortex Beams at Different Frequencies from Laminated Meta-Surface Lenses

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 61
Author(s):  
Pengfei Gao ◽  
Rui Yang
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Communication System ◽  
The Other ◽  
Vortex Beam ◽  
Other Hand ◽  
High Efficient ◽  
Linearly Polarized ◽  
Vortex Beams ◽  
The Way

We demonstrate the generation of multiple orbital angular momentum (OAM) vortex beams with different radiating states at different frequencies through a laminated meta-surface lens consisting of a dual polarized meta-array interconnected with a frequency selective meta-array. The co-linearly polarized (LP) waves from the source can directly penetrate the meta-surface lens to form multiple OAM vortex beams at one frequency. On the other hand, the meta-surface lens will be capable of releasing the cross-LP counterparts at another frequency with high-efficient polarization conversions to have multiple OAM vortex radiations with different radiating directions and vortex modes. Our design, using laminated meta-surface lens to synthesize multiple OAM vortex beams with orthogonal polarizations at different frequencies, should pave the way for building up more advanced vortex beam communication system with expanded diversity of the meta-device.

Linearly polarized orbital angular momentum mode purity measurement in optical fibers

2017 ◽  
Vol 56 (7) ◽  
pp. 1990 ◽  
Author(s):  
Youchao Jiang ◽  
Guobin Ren ◽  
Haisu Li ◽  
Min Tang ◽  
Yu Liu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Optical Fibers ◽  
Orbital Angular Momentum ◽  
Linearly Polarized ◽  
Momentum Mode ◽  
Mode Purity

Advanced Mode Unity Using Loop Antennas Proximate to Reflector for Orbital Angular Momentum Communication

2018 ◽  
Author(s):  
Ryohei Yamagishi ◽  
Hiroto Otsuka ◽  
Ryo Ishikawa ◽  
Akira Saitou ◽  
Hiroshi Suzuki ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Loop Antennas
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