Article
Optics
Yanping Lan, Juntao Hu, Wenni Ye, Peiqi Zeng, Yixian Qian
Summary: We propose a universal approach to design and generate non-diffracting structured light beams with arbitrary shapes. A practical spectral superposition algorithm is developed to discuss the non-diffracting properties and experimental results confirm the numerical findings. These structured beams differ from classical non-diffracting beams and have the potential for new applications in optical micromachining.
Article
Optics
Hongmin Han, Jianqiang Ma, Bo Tao, Chao Xu, Yanlei Hu, Jiaru Chu
Summary: This paper successfully generates high-quality white-light Airy beams and Bessel beams using a deformable mirror by modulating the incident LED beam with tunable wavefronts. The generated white-light non-diffraction beams are not affected by chromatic dispersion during propagation, and the generation of white-light Bessel beams has higher requirements for spatial coherence.
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
Lyubomir Stoyanov, Yinyu Zhang, Alexander Dreischuh, Gerhard G. Paulus
Summary: This study demonstrates a simple and efficient method for generating zeroth- and first-order non-diffracting Gauss-Bessel beams using a single reflective spatial light modulator. Even in the sub-8-fs range, there is no noticeable impact on the measured pulse duration, with the only effect being a weak coloring of the outer-lying satellite rings of the beams due to the broad spectrum. The obtained beams have diffraction half-angles below 40 μrad and can propagate over distances exceeding 1.5 meters.
Article
Physics, Applied
Anchen Ni, Zhifei Shi
Summary: In this work, a novel inertial amplified topological metamaterial beam is proposed to overcome the large mass limitation for low-frequency topologically protected interface modes. The dynamic characteristics of the system are investigated through detailed analytical and numerical studies. The existence of the topologically protected interface modes is verified through transmission simulation. The lower-frequency Dirac cone and wider local resonance bandgaps are obtained without sacrificing total stiffness or increasing total mass.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Biology
Roberto De Filippo, Dietmar Schmitz
Summary: Hippocampal ripples are synchronous neural events critical for memory consolidation and retrieval. This study used a large dataset to analyze ripple propagation within the hippocampal formation and found that strong ripples propagate differently depending on their generation point along the hippocampal axis. The results suggest a distinctive role of the hippocampal septal pole in conditions of high-memory demand and highlight the impact of ripple generation location on neural activity across the hippocampus.
Article
Optics
Mingxian Guo, Wei Le, Chao Wang, Guanghao Rui, Zhuqing Zhu, Jun He, Bing Gu
Summary: Compared with the on-axis vortex beam and the off-axis single vortex beam, the off-axis double vortex beam has more control degrees of freedom and brings rich physical properties. In this work, the generation, topological charge (TC), and orbital angular momentum (OAM) of off-axis double vortex beams are investigated theoretically and experimentally. The tilted lens method is demonstrated to detect the magnitudes, signs, and spatial distribution of two TCs of the off-axis double vortex beam. Moreover, the average OAM of the off-axis double vortex beam can be easily controlled by changing the relative position of two-phase singularities, enabling applications in multi-degrees of freedom particle manipulation, optical communication, and material processing.
Article
Optics
Wenxiang Yan, Yuan Gao, Zheng Yuan, Zhuang Wang, Zhi-Cheng Ren, Xi-Lin Wang, Jianping Ding, Hui-Tian Wang
Summary: This study introduces a method to generate self-accelerating zeroth-order Bessel beams with tunable z direction intensity profiles, which may attract interest in the fields of particle manipulation, microfabrication, and free-space optical interconnects.
Article
Optics
J. C. G. De Sande, O. Korotkova, M. Santarsiero, R. Martinez-Herrero, G. Piquero, F. Gori
Summary: This study reveals that the on-axis spectral density and degree of polarization of beams radiated by electromagnetic sources can be finely controlled by changing the source parameters. Unlike previously known beams, the dynamics of the on-axis spectral density and degree of polarization in this beam class can be controlled independently. The study also proposes a simple experimental scheme for generating a broad class of electromagnetic circularly coherent sources.
Article
Physics, Applied
Ning Ding, Qingyu Ma, Yuzhi Li, Gepu Guo, Juan Tu, Dong Zhang
Summary: OA-AV beams can be constructed by introducing phase delays to traditional transducer arrays for contactless manipulations, showing a linear trajectory. The axial and cross-sectional profiles of the acoustic-vortex beams can be adjusted based on the order and radial offset.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
F. Boschini, M. Minola, R. Sutarto, E. Schierle, M. Bluschke, S. Das, Y. Yang, M. Michiardi, Y. C. Shao, X. Feng, S. Ono, R. D. Zhong, J. A. Schneeloch, G. D. Gu, E. Weschke, F. He, Y. D. Chuang, B. Keimer, A. Damascelli, A. Frano, E. H. da Silva Neto
Summary: Resonant x-ray scattering on Bi2Sr2CaCu2O8+delta reveals dynamic quasi-circular patterns in the CuO2 plane, corresponding to static charge order. The results suggest a competition between charge order and superconductivity, with short-range domains dynamically rotating in different directions. Effective Coulomb interactions play a key role in understanding emergent quantum phases and symmetry breaking in cuprates.
NATURE COMMUNICATIONS
(2021)
Article
Optics
You Wu, Chuangjie Xu, Huixin Qiu, Danlin Xu, Dongmei Deng
Summary: In this paper, we demonstrate the generation of circular symmetric Airy-like vortex beams that propagate along pre-designed parabolic trajectories by phase-modulating the optical wavefront. The resulting beams exhibit the capability of closed-ring vortex propagation along an accelerating parabolic trajectory, and the vortex can reproduce after being blocked. Furthermore, by imposing off-axis optical vortexes, single twisted dark channels or multiple tornado dark channels with rotating orbital angular momentum along the predesigned parabolic trajectories can be formed, which has potential applications in light capturing.
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
Physics, Multidisciplinary
Yuanfei Hui, Zhiwei Cui, Pan Song
Summary: By investigating the propagation of Lommel beams in a gradient-index medium, we derived analytical expressions for the complex amplitude of the beams and analyzed their intensity distribution and Poynting vector. Our results show that the beams focus at singularities in the medium and exhibit periodic beam profiles induced by symmetrical refractive index patterns. Additionally, we discussed the effects of asymmetry factors and topological charges on the beam propagation characteristics.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Optics
Michel Zamboni-Rached, Leonardo Andre Ambrosio, Ahmed H. Dorrah, Mo Mojahedi
Article
Physics, Applied
Mateus Corato-Zanarella, Ahmed H. Dorrah, Michel Zamboni-Rached, Mo Mojahedi
PHYSICAL REVIEW APPLIED
(2018)
Article
Optics
Yousuf Aborahama, Ahmed H. Dorrah, Mo Mojahedi
Article
Optics
Ahmed H. Dorrah, Noah A. Rubin, Aun Zaidi, Michele Tamagnone, Federico Capasso
Summary: By using metasurfaces to independently shape the polarization state of a light beam at each point in space along its propagation direction, longitudinally variable polarization optical components are demonstrated; a new class of polarizers and wave plates based on metasurfaces can impart an arbitrarily chosen polarization response along the propagation direction, regardless of the incident polarization; this approach allows for the desired propagation-dependent polarization response to be enacted without prior knowledge of the incident polarization, expanding the use of polarization in the design of multifunctional metasurfaces.
Article
Multidisciplinary Sciences
Noah A. Rubin, Aun Zaidi, Ahmed H. Dorrah, Zhujun Shi, Federico Capasso
Summary: A new class of computer-generated holograms called Jones matrix holograms are introduced, which allow for designer-specified polarization response in the far-fields. These holograms can be implemented using form-birefringent metasurfaces. The technology generalizes past research and demonstrates previously unrealized devices, showcasing examples such as holograms with parallel polarization analysis and customized waveplate-like behavior.
Article
Optics
Aun Zaidi, Noah A. Rubin, Ahmed H. Dorrah, Joon-Suh Park, Federico Capasso
Summary: Metasurfaces were used to design a novel polarization transformation device without relying on traditional polarization components, showing promising applications in various fields.
Article
Multidisciplinary Sciences
Ahmed H. Dorrah, Noah A. Rubin, Michele Tamagnone, Aun Zaidi, Federico Capasso
Summary: By introducing two new types of metasurfaces, the constraints of generating special structured light beams have been lifted, further advancing the development of light-matter interaction and imaging applications.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Ahmed H. Dorrah, Michele Tamagnone, Noah A. Rubin, Aun Zaidi, Federico Capasso
Summary: A new manifestation of the Berry phase in 3D structured light has been discovered, where its polarization state evolves adiabatically along the optical path. This accumulated phase shift elegantly coincides with Berry's prediction, offering new possibilities for optics and beyond.
Review
Multidisciplinary Sciences
Ahmed H. Dorrah, Federico Capasso
Summary: Flat optics, with its subwavelength resolution, ease of integration, and compact design, has become a crucial player in the field of structured light and its applications. The new generation of meta-optics can shape the light and dark features of an optical field with unprecedented complexity and multifunctionality. These advancements have the potential to revolutionize camera systems, microscopes, holography, portable devices, and wearable technology, and may also open up new possibilities in optical communications and sensing.
Article
Optics
Ahmed H. Dorrah, Priyanuj Bordoloi, Vinicius S. de Angelis, Jhonas O. de Sarro, Leonardo A. Ambrosio, Michel Zamboni-Rached, Federico Capasso
Summary: A stack of longitudinal 2D light sheets is proposed for generating 3D holographic images with improved depth perception. This new hologram projection method allows for continuous reconstruction of the object along the optical path by projecting 2D scenes onto perpendicular sheets. By decomposing the target scene into non-diffracting pencil-like beams, high fidelity 3D objects can be constructed with low crosstalk. This computer-generated holography opens new possibilities for realistic 3D holography in wearable smart glasses, portable devices, and wide-angle volumetric displays.
Proceedings Paper
Engineering, Electrical & Electronic
Ahmed H. Dorrah, Mateus Corato-Zanarella, Michel Zamboni-Rached, Mo Mojahedi
LASER RESONATORS, MICRORESONATORS, AND BEAM CONTROL XX
(2018)
Proceedings Paper
Engineering, Electrical & Electronic
Ahmed H. Dorrah, Arthur O. Montazeri, Hoi-Ying Holman, Mo Mojahedi
2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2017)
Article
Physics, Applied
Ahmed H. Dorrah, Michel Zamboni-Rached, Mo Mojahedi
APPLIED PHYSICS LETTERS
(2017)
Article
Optics
Ahmed H. Dorrah, Mo Mojahedi