Article
Optics
Jingyin Zhao, Yunxia Jin, Fanyu Kong, Dongbing He, Hongchao Cao, Wang Hao, Yubo Wu, Jianda Shao
Summary: Measuring the topological charge (TC) of optical vortex beams by the edge-diffraction pattern of a single plate is proposed and demonstrated in this paper. The redundant fringes of the diffracted fork-shaped pattern can determine the TC value, and the orientation of the fork indicates the handedness of the vortex. The method is practical and easy to implement, offering convenience and efficiency for researchers.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Peizhi Sun, Binghui Liu, Yifei Wang, Conglong Yuan, Shuzhen Jia, Dong Shen, Zhi-Gang Zheng
Summary: This work proposes a creative paradigm to generate ultrabroadband multichannel vector vortex beams (VVBs) by programming the electric field vector through photopatterning of twisted nematic liquid crystals. The multichannel VVBs have been demonstrated to propagate along an unprecedented bandwidth over 1000 nm and can be optionally regulated in either a reversible or irreversible manner. This methodology has promising applications in photonics, quantum science, and fundamental physics.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Victor V. Kotlyar, Alexey A. Kovalev, Pouria Amiri, Peyman Soltani, Saifollah Rasouli
Summary: The study investigates the topological charge of the sum of two axisymmetric off-axis Laguerre-Gaussian beams, finding that when the indices are the same, the combined beam has the topological charge of one of the individual beams. Different indices result in the sum taking on specific values for the topological charge. Additionally, rules for selecting a feasible topological charge value are established, along with exploring the effects of exchanging and shifting between beams on the topological charge.
Article
Engineering, Electrical & Electronic
Rahul Kumar, Allarakha Shikder, Naveen K. Nishchal, Ayman Alfalou
Summary: A novel technique is proposed in this letter to identify the topological charge (TC) of a vortex beam using the optical correlation method. The proposed method enables instant identification of TC without manual counting and requires lesser datasets with simple architecture, compared to the traditional methods.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Victor V. Kotlyar, Alexey A. Kovalev, Eugeny G. Abramochkin
Summary: If a vortex propagation-invariant beam is given by all its intensity nulls, the topological charge (TC) can be easily defined as the sum of the topological charges of all optical vortices in these nulls. However, if a propagation-invariant beam is given as a superposition of several light fields, determining its TC becomes a complicated task. In this study, we derive the topological charges of four different types of propagation-invariant beams and demonstrate that the TC remains unchanged when certain parameters of the beams are altered.
Article
Optics
Alexey A. Kovalev, Victor V. Kotlyar, Anton G. Nalimov
Summary: It is commonly known that the orbital angular momentum (OAM) of a light field is conserved during propagation, but the conservation of the topological charge (TC) is different and has unique physical meaning. The study reveals that there are other quantities that are also propagation-invariant, with theoretically infinite invariants. Numerical simulations confirm the conservation of two such invariants for two light fields, which can have applications in optical data transmission for identifying optical signals.
Article
Optics
Alexey A. Kovalev, Victor V. Kotlyar
Summary: Gaussian optical vortices with infinite topological charge have a countable number of phase singularities, typically with unitary topological charge, located equidistantly or not on a straight line. Their orbit angular momentum is finite, which can be adjusted by changing the Gaussian beam waist radius. Additionally, a Gaussian beam with a countable number of edge dislocations can be transformed into an infinite-topological-charge beam after an astigmatic transform.
Article
Engineering, Electrical & Electronic
Lanlin Ni, Songtao Chang, Haojie Xia
Summary: This letter studies the diffraction pattern of a Laguerre-Gaussian (LG) beam passing through a Y-shaped aperture (YA) for measuring the topological charge (TC) of the beam. It confirms that the magnitude and sign of TC can be measured using YA, and investigates the effect of YA size on the diffraction pattern. The diffraction of YA itself can also verify the sign of TC, and the experimental results agree well with simulations. The method is simple and reliable.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Physics, Applied
Ali Mehdinejad
Summary: In this study, a four-level microwave-driven system is proposed to transfer the topological charge from an optical vortex light to a newly created signal light. The exchange efficiency of the created light is investigated by adjusting the intensity of the microwave field. The absorption and dispersion spectra of the created light vary depending on the azimuthal angle of the vortex light, and altering the azimuthal angle can transform the absorption curve into a gain spectrum.
MODERN PHYSICS LETTERS B
(2023)
Article
Optics
Saeed Ghavami Sabouri
Summary: In this paper, a new type of vortex beam with asymmetrically embedded phase jumps is reported. By designing a specific forked grating and displaying it on a spatial light modulator, this type of vortex beam is experimentally generated. The position of the phase jumps on the wavefront of the vortex beam can be determined by measuring the relative orientation of the intensity profile of the opposite orbital angular momentum (OAM) beams in the first diffraction order.
Article
Optics
A. A. Kovalev, V. V. Kotlyar
Summary: This study investigates multivortex beams with infinite topological charge and explores their characteristics and changes. Increasing the waist radius of the Gaussian beam leads to a parabolic growth in the orbital angular momentum of such beams.
Article
Engineering, Multidisciplinary
Xinjian Pan, Chongfu Zhang, Chunjian Deng, Zhili Li, Qing Wang
Summary: An efficient and simple method for measuring the topological charge and ellipticity of elliptic vortex beams is presented in this paper. The scheme works well even for high-order elliptic vortex, with a topological charge value as high as +/- 18 and an ellipticity range from 0.5 to 2. The measurement of topological charge and ellipticity has important research value for promoting the application of elliptical vortex beams.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Hammad Ahmed, Muhammad Afnan Ansari, Yan Li, Thomas Zentgraf, Muhammad Qasim Mehmood, Xianzhong Chen
Summary: A metasurface is used to generate hybrid grafted perfect vector vortex beams with dynamic control. These beams have spatially variant rates of polarization change due to the involvement of more topological charges. The ability to dynamically control perfect vector vortex beams has not been reported before, and this study demonstrates their generation and control using a multifunctional metasurface and a rotating half waveplate.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Hammad Ahmed, Yuttana Intaravanne, Yang Ming, Muhammad Afnan Ansari, Gerald S. Buller, Thomas Zentgraf, Xianzhong Chen
Summary: This study proposes a compact metasurface approach to generate and manipulate vortex beams in multiple channels, eliminating the need for a complex optical setup. By using a single metasurface, the superposition of vortex beams with different topological charges can be achieved and the positions of singularities can be modulated. This work provides new opportunities for investigating and applying vortex beams in emerging fields such as singular optics and quantum science.
ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
Qian Kong, Chuanfu Cheng, Zijun Zhan, Chunxiang Liu, Hong Ma, Xiaorong Ren, Yuqin Zhang, Li Ma, Xiangyu Zeng, Ruirui Zhang, Changwei He, Chen Cheng
Summary: The determination of the topological charge of orbital angular momentum (OAM) states has been achieved by proposing the antiphase semicircular slit pair (ASSP) as a novel approach, which measures the shift between two bright spots to determine the OAM state's topological charge.
NEW JOURNAL OF PHYSICS
(2021)
Article
Optics
E. M. Becerra-Castro, Luis E. E. de Araujo
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2016)
Article
Optics
Octavio J. S. Santana, Silvania A. Carvalho, Stefano De Leo, Luis E. E. de Araujo
Article
Physics, Multidisciplinary
Christopher A. Mancuso, Kevin M. Dorney, Daniel D. Hickstein, Jan L. Chaloupka, Jennifer L. Ellis, Franklin J. Dollar, Ronny Knut, Patrik Grychtol, Dmitriy Zusin, Christian Gentry, Maithreyi Gopalakrishnan, Henry C. Kapteyn, Margaret M. Murnane
PHYSICAL REVIEW LETTERS
(2016)
Article
Physics, Multidisciplinary
Jan L. Chaloupka, Daniel D. Hickstein
PHYSICAL REVIEW LETTERS
(2016)
Article
Optics
Julian L. Pita, Ivan Aldaya, Octavio J. S. Santana, Luis E. E. De Araujo, Paulo Dainese, Lucas H. Gabrielli
Article
Optics
Ulices F. Apolinario, Shamaila Manzoor, Luis E. E. de Araujo
Article
Optics
Alejandra Serrano-Trujillo, Matthew E. Anderson
OPTICS COMMUNICATIONS
(2018)
Article
Optics
Octavio J. S. Santana, Luis E. E. de Araujo
Article
Optics
Octavio J. S. Santana, Luis E. E. de Araujo
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2019)
Article
Optics
Octavio J. S. Santana, Luis E. E. de Araujo
Article
Chemistry, Multidisciplinary
Matthew E. Anderson, Alejandra Serrano, Cory Stinson, Antonio Talamantes, Nick Miller, Jan L. Chaloupka
APPLIED SCIENCES-BASEL
(2020)
Article
Optics
Jan L. Chaloupka
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2020)
Article
Physics, Multidisciplinary
Matthew E. Anderson
Article
Optics
Christopher A. Mancuso, Kevin M. Dorney, Daniel D. Hickstein, Jan L. Chaloupka, Xiao-Min Tong, Jennifer L. Ellis, Henry C. Kapteyn, Margaret M. Murnane
