Transformation of the vortex part of the orbital angular momentum in first-order optical systems

2004 ◽  
Author(s):  
Tatiana Alieva ◽  
Martin J. Bastiaans
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Systems ◽  
First Order

scholarly journals Metasurface Spiral Focusing Generators with Tunable Orbital Angular Momentum Based on Slab Silicon Nitride Waveguide and Vanadium Dioxide (VO2)

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1864
Author(s):  
Li Chen ◽  
Lin Zhao ◽  
Yuan Hao ◽  
Wenyi Liu ◽  
Yi Wu ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Vanadium Dioxide ◽  
Communication Systems ◽  
High Speed ◽  
Focal Length ◽  
Polarized Light ◽  
Optical Systems ◽  
Gaussian Beams ◽  
The Impact

The metasurface spiral focusing (MSF) generator has gained attention in high-speed optical communications due to its spatial orthogonality. However, previous MSF generators only can generate a single orbital angular momentum (OAM) mode for one polarized light. Here, a MSF generator with tunable OAM is proposed and it has the ability to transform linearly polarized light (LPL), circularly polarized light or Gaussian beams into vortex beams which can carry tunable OAM at near-infrared wavelength by controlling the phase transition of vanadium dioxide (VO2). Utilizing this MSF generator, the beams can be focused on several wavelength-sized rings with efficiency as high as 76%, 32% when VO2 are in the insulating phase and in the metallic phase, respectively. Moreover, we reveal the relationship between the reflective focal length and transmissive focal length, and the latter is 2.3 times of the former. We further demonstrate the impact of Gaussian beams with different waist sizes on MSF generators: the increase in waist size produces the enhancement in spiral focusing efficiency and the decrease in size of focal ring. The MSF generator we proposed will be applicable to a variety of integrated compact optical systems, such as optical communication systems and optical trapping systems.

On a New Analytic Theory of the Moon's Motion I: Orbital Angular Momentum

2020 ◽  
Vol 57 ◽  
pp. 1-43
Author(s):  
Ramon González Calvet ◽  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Order Approximation ◽  
Orbital Plane ◽  
Analytic Theory ◽  
The Sun ◽  
The Moon ◽  
First Order ◽  
First Order Approximation ◽  
Ecliptic Longitude

A new analytic theory of the Moon's motion is deduced from the Lagrangian of the Sun-Earth-Moon system expressed with relative velocities. In its first-order approximation, the first-degree terms of the ratio of distances from Earth to the Moon and to the Sun are taken. The calculated relative variation in the Moon's orbital angular momentum is resolved into components whose integrals yield the inclination of the orbital plane, the ecliptic longitude of the ascending node and the norm of the angular momentum as functions of the angle between the Moon and the ascending node.

scholarly journals Generation, Transmission and Application of Orbital Angular Momentum in Optical Fiber: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Minghao Ma ◽  
Yudong Lian ◽  
Yulei Wang ◽  
Zhiwei Lu
Keyword(s):  
Angular Momentum ◽  
Optical Fibers ◽  
Orbital Angular Momentum ◽  
Optical Systems ◽  
Necessary Condition ◽  
Fiber Grating ◽  
Crystal Fiber ◽  
Effective Use ◽  
Propagation Properties ◽  
Ring Core

Optical orbital angular momentum (OAM) has become a hot research topic because of its unique properties due to its spiral distribution of phases. The production and transmission of OAM has also become a necessary condition for effective use of OAM. As an optical waveguide with good propagation properties, optical fibers are used in optical systems supporting OAM. This paper introduces the OAM generation and transmission system based on fiber, summarizes the current photonic crystal fiber, ring core fiber, fiber grating and other all-fiber systems that can support OAM modes, and explains some experimental principles. Finally, an outlook on OAM generation or transmission devices for all-fiber systems is presented, providing a useful reference for future related research.

scholarly journals On the Orbital Angular Momentum Incident Fields in Linearized Microwave Imaging

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1905
Author(s):  
Santi Concetto Pavone ◽  
Gino Sorbello ◽  
Loreto Di Donato
Keyword(s):  
Angular Momentum ◽  
Wireless Communications ◽  
Channel Capacity ◽  
Orbital Angular Momentum ◽  
Microwave Imaging ◽  
Next Generation ◽  
First Order ◽  
Rytov Approximation

Orbital angular momentum (OAM) is gaining great attention in the physics and electromagnetic community owing to an intriguing debate concerning its suitability for widening channel capacity in next-generation wireless communications. While such a debate is still a matter of controversy, we exploit OAM generation for microwave imaging within the classical first order linearized models, i.e., Born and Rytov approximation. Physical insights into different fields carrying ℓ-order OAM are conveniently exploited to propose possible alternative imaging approaches and paradigms in microwave imaging.

Anti-resonant reflecting guidance mechanism in ring-core fibers for the first-order orbital angular momentum modes generation

2021 ◽  
Author(s):  
Jianheng Qiu ◽  
Liang Zhang ◽  
Heming Wei ◽  
Yana Shang ◽  
Jianxiang Wen ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
First Order ◽  
Ring Core

scholarly journals Quantum Hyper-CPHASE Gates with Polarisation and Orbital Angular Momentum Degrees of Freedom and Generalisation to Arbitrary Hyper-Conditional Gates

2020 ◽  
Author(s):  
Mrittunjoy Guha Majumdar
Keyword(s):  
Angular Momentum ◽  
Quantum Logic ◽  
Orbital Angular Momentum ◽  
Arbitrary Number ◽  
Degrees Of Freedom ◽  
Single Photon ◽  
Optical Systems ◽  
Cluster States ◽  
Quantum Cluster

In this paper, a controlled-phase-flip (P-CPF) gate using the polarisation and orbital angular momentum degrees of freedom for single-photon two-qubit quantum logic is proposed. This is critical to the realisation of quantum cluster states and graph networks using transverse degrees of freedom. A generalisation of the proposed scheme to arbitrary number and kinds of degrees of freedom, for optical systems, as well as arbitrary operations to be conditionally performed is proposed.

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