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’.

On-chip discrimination of orbital angular momentum of light with plasmonic nanoslits

Nanoscale ◽  
2016 ◽  
Vol 8 (4) ◽  
pp. 2227-2233 ◽  
Author(s):  
Shengtao Mei ◽  
Kun Huang ◽  
Hong Liu ◽  
Fei Qin ◽  
Muhammad Q. Mehmood ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communication ◽  
Communication System ◽  
Degree Of Freedom ◽  
System Capacity ◽  
Optical Communication System ◽  
On Chip

The orbital angular momentum (OAM) of light can be taken as an independent and orthogonal degree of freedom for multiplexing in an optical communication system, potentially improving the system capacity to hundreds of Tbits per second.

scholarly journals Integrated Photonic Orbital Angular Momentum Multiplexing and Demultiplexing on Chip

2014 ◽  
Author(s):  
Ryan P. Scott ◽  
Roberto Proietti ◽  
Binbin Guan ◽  
S. J. Yoo
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
On Chip

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 Ultrafast control of fractional orbital angular momentum of microlaser emissions

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhifeng Zhang ◽  
Haoqi Zhao ◽  
Danilo Gomes Pires ◽  
Xingdu Qiao ◽  
Zihe Gao ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communication ◽  
High Speed ◽  
Quantum Information Processing ◽  
Time Window ◽  
Gain Medium ◽  
Control Pulse ◽  
Processing Technologies ◽  
On Chip

Abstract On-chip integrated laser sources of structured light carrying fractional orbital angular momentum (FOAM) are highly desirable for the forefront development of optical communication and quantum information–processing technologies. While integrated vortex beam generators have been previously demonstrated in different optical settings, ultrafast control and sweep of FOAM light with low-power control, suitable for high-speed optical communication and computing, remains challenging. Here we demonstrate fast control of the FOAM from a vortex semiconductor microlaser based on fast transient mixing of integer laser vorticities induced by a control pulse. A continuous FOAM sweep between charge 0 and charge +2 is demonstrated in a 100 ps time window, with the ultimate speed limit being established by the carrier recombination time in the gain medium. Our results provide a new route to generating vortex microlasers carrying FOAM that are switchable at GHz frequencies by an ultrafast control pulse.

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’.

Deep learning as a tool to distinguish between high orbital angular momentum optical modes

2016 ◽  
Author(s):  
E. M. Knutson ◽  
Sanjaya Lohani ◽  
Onur Danaci ◽  
Sean D. Huver ◽  
Ryan T. Glasser
Keyword(s):  
Angular Momentum ◽  
Deep Learning ◽  
Orbital Angular Momentum ◽  
Optical Modes
Sign in / Sign up

Export Citation Format

Share Document