scholarly journals Optical orbital angular momentum: twisted light and chirality

2018 ◽  
Vol 43 (3) ◽  
pp. 435 ◽  
Author(s):  
Kayn A. Forbes ◽  
David L. Andrews
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Twisted Light

Quantized optical orbital angular momentum precession and nutation in a twisted light

2020 ◽  
Vol 95 (8) ◽  
pp. 085509
Author(s):  
Zhuoyuan Wang ◽  
Shi Yao Chong ◽  
Peihong Cheng ◽  
Peng An ◽  
Jian Qi Shen
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Twisted Light

scholarly journals Origins and demonstrations of electrons with orbital angular momentum

2017 ◽  
Vol 375 (2087) ◽  
pp. 20150434 ◽  
Author(s):  
Benjamin J. McMorran ◽  
Amit Agrawal ◽  
Peter A. Ercius ◽  
Vincenzo Grillo ◽  
Andrew A. Herzing ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Free Space ◽  
Rest Mass ◽  
Wave Functions ◽  
Matter Wave ◽  
Optical Manipulation ◽  
Electron Wave ◽  
Mechanical Wave ◽  
Twisted Light

The surprising message of Allen et al. (Allen et al. 1992 Phys. Rev. A 45 , 8185 ( doi:10.1103/PhysRevA.45.8185 )) was that photons could possess orbital angular momentum in free space, which subsequently launched advancements in optical manipulation, microscopy, quantum optics, communications, many more fields. It has recently been shown that this result also applies to quantum mechanical wave functions describing massive particles (matter waves). This article discusses how electron wave functions can be imprinted with quantized phase vortices in analogous ways to twisted light, demonstrating that charged particles with non-zero rest mass can possess orbital angular momentum in free space. With Allen et al. as a bridge, connections are made between this recent work in electron vortex wave functions and much earlier works, extending a 175 year old tradition in matter wave vortices. This article is part of the themed issue ‘Optical orbital angular momentum’.

scholarly journals Controlling light’s helicity at the source: orbital angular momentum states from lasers

2017 ◽  
Vol 375 (2087) ◽  
pp. 20150436 ◽  
Author(s):  
Andrew Forbes
Keyword(s):  
Angular Momentum ◽  
Solid State ◽  
Orbital Angular Momentum ◽  
Laser Cavity ◽  
Solid State Lasers ◽  
On Demand ◽  
Twisted Light ◽  
Optical Modes ◽  
On Chip

Optical modes that carry orbital angular momentum (OAM) are routinely produced external to the laser cavity and have found a variety of applications, thus increasing the demand for integrated solutions for their production. Yet such modes are notoriously difficult to produce from lasers due to the strict symmetry requirements for their creation, together with the need to break the degeneracy in helicity. Here, we review the progress made since 1992 in producing such twisted light modes directly at the source, from gas to solid-state lasers, bulk to integrated on-chip solutions, through to generic devices for on-demand OAM in both scalar and vector forms. This article is part of the themed issue ‘Optical orbital angular momentum’.

scholarly journals Twisted light transmission over 143 km

2016 ◽  
Vol 113 (48) ◽  
pp. 13648-13653 ◽  
Author(s):  
Mario Krenn ◽  
Johannes Handsteiner ◽  
Matthias Fink ◽  
Robert Fickler ◽  
Rupert Ursin ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Adaptive Optics ◽  
Orbital Angular Momentum ◽  
Free Space ◽  
Light Transmission ◽  
Short Message ◽  
Spatial Modes ◽  
Twisted Light ◽  
Transmission Quality

Spatial modes of light can potentially carry a vast amount of information, making them promising candidates for both classical and quantum communication. However, the distribution of such modes over large distances remains difficult. Intermodal coupling complicates their use with common fibers, whereas free-space transmission is thought to be strongly influenced by atmospheric turbulence. Here, we show the transmission of orbital angular momentum modes of light over a distance of 143 km between two Canary Islands, which is 50× greater than the maximum distance achieved previously. As a demonstration of the transmission quality, we use superpositions of these modes to encode a short message. At the receiver, an artificial neural network is used for distinguishing between the different twisted light superpositions. The algorithm is able to identify different mode superpositions with an accuracy of more than 80% up to the third mode order and decode the transmitted message with an error rate of 8.33%. Using our data, we estimate that the distribution of orbital angular momentum entanglement over more than 100 km of free space is feasible. Moreover, the quality of our free-space link can be further improved by the use of state-of-the-art adaptive optics systems.

scholarly journals Engineering Entangled Photons for Transmission in Ring-Core Optical Fibers

2021 ◽  
Vol 9 ◽  
Author(s):  
G. Cañas ◽  
E. S. Gómez ◽  
E. Baradit ◽  
G. Lima ◽  
S. P. Walborn
Keyword(s):  
Angular Momentum ◽  
Optical Fibers ◽  
Orbital Angular Momentum ◽  
Entangled Photons ◽  
Two Photon ◽  
Twisted Light ◽  
Optical Communication Channels ◽  
Gaussian Mode ◽  
Constant Shape ◽  
Ring Core

The capacity of optical communication channels can be increased by space division multiplexing in structured optical fibers. Radial core optical fibers allows for the propagation of twisted light–eigenmodes of orbital angular momentum, which have attracted considerable attention for high-dimensional quantum information. Here we study the generation of entangled photons that are tailor-made for coupling into ring core optical fibers. We show that the coupling of photon pairs produced by parametric down-conversion can be increased by close to a factor of three by pumping the non-linear crystal with a perfect vortex mode with orbital angular momentum ℓ, rather than a gaussian mode. Moreover, the two-photon orbital angular momentum spectrum has a nearly constant shape. This provides an interesting scenario for quantum state engineering, as pumping the crystal with a superposition of perfect vortex modes can be used in conjunction with the mode filtering properties of the ring core fiber to produce simple and interesting quantum states.

scholarly journals Hanbury Brown and Twiss interferometry with twisted light

2016 ◽  
Vol 2 (4) ◽  
pp. e1501143 ◽  
Author(s):  
Omar S. Magaña-Loaiza ◽  
Mohammad Mirhosseini ◽  
Robert M. Cross ◽  
Seyed Mohammad Hashemi Rafsanjani ◽  
Robert W. Boyd
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Phase Distribution ◽  
Angular Position ◽  
Optical Vortices ◽  
Optical Wave ◽  
Twisted Light ◽  
Momentum Mode ◽  
The Rich ◽  
Random Fluctuations

The rich physics exhibited by random optical wave fields permitted Hanbury Brown and Twiss to unveil fundamental aspects of light. Furthermore, it has been recognized that optical vortices are ubiquitous in random light and that the phase distribution around these optical singularities imprints a spectrum of orbital angular momentum onto a light field. We demonstrate that random fluctuations of intensity give rise to the formation of correlations in the orbital angular momentum components and angular positions of pseudothermal light. The presence of these correlations is manifested through distinct interference structures in the orbital angular momentum–mode distribution of random light. These novel forms of interference correspond to the azimuthal analog of the Hanbury Brown and Twiss effect. This family of effects can be of fundamental importance in applications where entanglement is not required and where correlations in angular position and orbital angular momentum suffice. We also suggest that the azimuthal Hanbury Brown and Twiss effect can be useful in the exploration of novel phenomena in other branches of physics and astrophysics.

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