Phase singularities and optical vortices in photonics

AP Porfirev, AA Kuchmizhak, SO Gurbatov… - Phys. Usp, 2022‏ - ufn.ru
Since the second half of the 20th century, ideas to develop methods for the formation of
optical vortices (OVs) or OV beams–regions of circular motion of energy flow in an …

Orbital angular momentum optical communications enhanced by artificial intelligence

B Li, H Luan, K Li, Q Chen, W Meng, K Cheng… - Journal of …, 2022‏ - iopscience.iop.org
Angular momentum of light can be divided into spin angular momentum and orbital angular
momentum (OAM). Due to the theoretically unlimited orthogonal states, the physical …

3D printed sub-terahertz all-dielectric lens for arbitrary manipulation of quasi-nondiffractive orbital angular momentum waves

X He, Y Yang, L Deng, S Li, B Feng - ACS applied materials & …, 2021‏ - ACS Publications
Terahertz (THz) vortex waves carrying orbital angular momentum (OAM) hold great potential
in dealing with the capacity crunch in wireless high-speed communication systems …

Distinguishing the topological charge of vortex beam via Fourier back plane imaging with chiral windmill structure

Y Guo, J Li, Y Fang - New Journal of Physics, 2024‏ - iopscience.iop.org
In recent years, research on the interaction between orbital angular momentum (OAM) of
light and matter has shown a continuous influx of investigations. OAM possesses distinct …

Ultralow-power spiking neural networks for 1024-ary orbital angular momentum shift keying free-space optical communication

B Li, Q Chen, H Su, K Cheng, H Luan, M Gu… - Journal of …, 2023‏ - iopscience.iop.org
The theoretical unbounded orbital angular momentum (OAM) states can be exploited as
data bits in the OAM shift keying (OAM-SK) free-space optical (FSO) communications. In …

Examining second-harmonic generation of high-order Laguerre–Gaussian modes through a single cylindrical lens

X Fang, Z Kuang, P Chen, H Yang, Q Li, W Hu, Y Lu… - Optics Letters, 2017‏ - opg.optica.org
We experimentally investigate the second-harmonic generation of a high-order Laguerre–
Gaussian (LG) mode under the quasi-phase-matching (QPM) configuration. First, we …

Directly generating orbital angular momentum in second-harmonic waves with a spirally poled nonlinear photonic crystal

D Wei, Y Zhu, W Zhong, G Cui, H Wang, Y He… - Applied Physics …, 2017‏ - pubs.aip.org
Based on nonlinear holography, we propose a 2D spirally poled LiNbO 3 nonlinear photonic
crystal that generates orbital angular momentum (OAM) states of second-harmonic (SH) …

On-chip orbital angular momentum sorter for demultiplexing based on arc-shaped waveguide grating

Z Wang, C Sun, S **ao, B Wu, Y Jiang - Optics & Laser Technology, 2022‏ - Elsevier
An on-chip orbital angular momentum (OAM) sorter based on the arc-shaped waveguide
grating coupler (AWGC) structure is proposed and numerically analyzed. Coupling …

Broadband variable meta-axicons based on nano-aperture arrays in a metallic film

Y Zhu, D Wei, Z Kuang, Q Wang, Y Wang, X Huang… - Scientific Reports, 2018‏ - nature.com
Metasurfaces are two-dimensional metamaterials composed of a carefully designed series
of subwavelength meta-atom (antenna or aperture) arrays. These surfaces can manipulate …

Optical orbital angular momentum read-out using a self-assembled plasmonic nanowire

DK Sharma, V Kumar, AB Vasista, D Paul… - ACS …, 2018‏ - ACS Publications
Orbital angular momentum (OAM) has emerged as an important parameter to store, control,
and transport information using light. Recognizing optical beams that carry OAM at the …