Article
Optics
Marjan Golbandi, Arash Sabatyan
Summary: This work introduces a technique based on a helically modulated petal zone plate for handling topological charge. The total topological charge of the generated beam depends on the difference between the number of the petal and the charge of the element, leading to a focused vortex beam turning into a focal spot. Additionally, a bi-annular vortex is generated with a large amount of petal frequency, forming an optical corridor carrying a topological charge around the focus.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Oana-Valeria Grigore, Alexandru Craciun
Summary: This study investigated the effect of illuminating a spiral phase plate (SPP) with a laser beam of a different wavelength, revealing the potential to determine the absolute value and sign of the SPP's topological charge using characteristic diffraction patterns. The results also suggest that this technique could be used for singularity manipulation and shaping the intensity distribution of vortex beams.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Seyyed Mojtaba Taheri Balanoji, Arash Sabatyan, Behnaz Javidi Rishakani
Summary: By utilizing spiral petal-like zone plates, we have demonstrated that the geometric shape of a spiral element influences its charge. In order to control the topological charge of a vortex without changing its geometrical shape, we apodize a spiral zone plate with p spiral zones using a radial grating with spatial frequency m. Through experimentation, we find that the topological charge and handedness of the optical vortex depend on p and m.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Physics, Applied
P. Raecke, J. Meijer, D. Spemann
Summary: The response of a dedicated image charge detector to small ion bunches was studied. The segmentation of the detector and cryogenic cooling were found to significantly enhance the signal-to-noise ratio (SNR) and detection sensitivity. Important experimental results for the realization of single ion detection were presented.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Instruments & Instrumentation
E. Rintoul, A. J. Boston, H. C. Boston, A. Caffrey, J. R. Cresswell, L. J. Harkness-Brennan, D. S. Judson, P. J. Nolan, J. Platt, C. Unsworth, T. F. Woodroof, I. H. Lazarus, J. Simpson, J. Cocks, D. Walker, B. Pirard, P. Quirin
Summary: This study evaluates the response and charge collection properties of a Mirion Technologies manufactured planar HPGe detector to gamma-ray interactions, characterizing the signal response through collimated beam scans and generating a database of average signals across the detector volume. A map of parameterized rise time response through depth is created to apply pulse shape analysis techniques, improving position resolution within the detector.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Article
Optics
Yufeng Hu, Xuan Liu, Mingke Jin, Yutao Tang, Xuecai Zhang, King Fai Li, Yan Zhao, Guixin Li, Jing Zhou
Summary: Vortex beams carrying orbital angular momentum have various applications in optical information processing, particle manipulation, and super-resolution imaging. Metasurfaces, with their strong ability in manipulating light phase, polarization, and amplitude, offer an ideal platform for realizing vortex beams with multiple optical functionalities. A new metasurface design based on the concept of a Fresnel zone plate is proposed to generate, focus, and perform interference between vortex beams, potentially opening new routes for high-dimensional optical information processing.
Article
Optics
Shahrbanoo Asghari, Arash Sabatyan
Summary: In this paper, a novel method using an azimuthal square zone plate to create controllable dark lines is introduced. The simulation predictions are verified by experimental results, and it is illustrated that the length of the dark lines depends on the grating period.
Article
Optics
Behnaz Roozbeh, Arash Sabatyan
Summary: This work investigates the distinct behavior of spiral checkerboard zone plates when illuminated by a plane wave. The element is composed of two orthogonal helical linear zone plates. By considering their topological charge, various structured beams are generated, exhibiting fascinating dynamics. Phenomena observed during the propagation of the beam include structure transformation, vortex pair production and annihilation, as well as the interaction between dipole and singular vortices. Additionally, the study highlights the interaction of screw dislocations, where they approach each other as the diffracted beam propagates towards the focus and move apart as the beam diverges from the focus.
OPTICS AND LASER TECHNOLOGY
(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
Victor Victorovich Kotlyar, Alexey Andreevich Kovalev, Anton Gennadyevich Nalimov, Sergey Sergeevich Stafeev
Summary: The study examines the topological charge of a coaxial superposition of Laguerre-Gaussian beams with different colors, revealing that the TC of the superposition is equal to the TC of the beam with the longest wavelength. The instantaneous TC remains constant during propagation, but the time-averaged intensity distribution of colored optical vortices changes.
Article
Optics
Hangrui Liang, Ping Jiang, Huajun Yang, Weinan Caiyang, Yan Qin
Summary: A phase compensational elliptical Fresnel zone plate is proposed to control the light field and generate vortex beams in this paper. Three types of elliptical vortex beams are generated by changing different phase plates, showing distinct characteristics and potential applications.
OPTICS COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Shihab Al-Daffaie, Alaa Jabbar Jumaah, Veronica Lain Rubio, Thomas Kusserow
Summary: An integrated lens-antenna is developed for a nanocontact based terahertz (THz) photomixer, providing a compact alternative to the bulky silicon lens. By using the Fresnel Zone Plate and simulating with the Meep tool, the lens-antenna is successfully integrated with the THz nanophotomixer. Experimental results demonstrate that the compact design of the lens-antenna exhibits comparable performance to the conventional bulky silicon lens, making it suitable for photonic integrated circuits based THz systems.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Rajeev Dwivedi, Parag Sharma, V. K. Jaiswal, Ranjana Mehrotra
Summary: This paper investigates a convenient technique for determining the topological charge of a vortex beam by analyzing the inclined high-intensity rectangular pattern generated by illuminating an elliptically squeezed conical phase. The study found that the separation in the horizontal vertices of the rectangular pattern exhibits a fixed variation with an integral change in the order of the beam and the inclination of the pattern indicates the sign of the topological charge.
OPTICS COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Haining Pan, Ming Xie, Fengcheng Wu, Sankar Das Sarma
Summary: This article presents a theoretical study on the quantum phase diagram of MoTe2/WSe2, using a self-consistent calculation method to obtain various results related to filling factors and interactions, including stable topological insulators, competing states, and topological charge density waves.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
O. J. Franca, Stefan Yoshi Buhmann
Summary: We study how transition radiation is modified by the presence of a generic magnetoelectric medium, with a special focus on topological insulators. We find that the electric field is a superposition of spherical waves and lateral waves, both having a purely topological origin. The main contribution to the radiation in a region far from the interface comes from the spherical waves.
Article
Optics
Arash Sabatyan, Jila Rafighdoost
OPTICS AND LASER TECHNOLOGY
(2018)
Article
Optics
Arash Sabatyan, Haleh Ebrahimi
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2018)
Article
Engineering, Electrical & Electronic
Arash Sabatyan, Babak Fathi
OPTICAL AND QUANTUM ELECTRONICS
(2018)
Article
Optics
Seyyed Mojtaba Taheri Balanoi, Abash Sabatyan
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2018)
Article
Engineering, Electrical & Electronic
Shima Gharbi, Arash Sabatyan
OPTICAL AND QUANTUM ELECTRONICS
(2019)
Article
Optics
Seyyed Mojtaba Taheri Balanoji, Arash Sabatyan
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2019)
Article
Optics
Arash Sabatyan
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2019)
Article
Optics
Haleh Ebrahimi, Arash Sabatyan
OPTICS AND LASER TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Fatemeh Seifi, Arash Sabatyan
Summary: The article discusses the creation of a novel diffractive element with unique behavior by combining different diffractive elements, focusing on the emergence and properties of a long-depth bifocal diffractive lens. Additionally, it explores the applications and characteristics of this new element.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Optics
Marjan Golbandi, Arash Sabatyan
Summary: This work introduces a technique based on a helically modulated petal zone plate for handling topological charge. The total topological charge of the generated beam depends on the difference between the number of the petal and the charge of the element, leading to a focused vortex beam turning into a focal spot. Additionally, a bi-annular vortex is generated with a large amount of petal frequency, forming an optical corridor carrying a topological charge around the focus.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Haleh Ebrahimi, Arash Sabatyan
Summary: This study presents a composite spiral photon sieve comprised of two independent segments, demonstrating the ability to generate various optical vortices by altering characteristic parameters. Experimental and analytical results show that changing hole density and weight can modify the shape and properties of the vortices.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Shahrbanoo Asghari, Arash Sabatyan
Summary: In this paper, a novel method using an azimuthal square zone plate to create controllable dark lines is introduced. The simulation predictions are verified by experimental results, and it is illustrated that the length of the dark lines depends on the grating period.
Article
Optics
Behnaz Roozbeh, Arash Sabatyan
Summary: This work investigates the distinct behavior of spiral checkerboard zone plates when illuminated by a plane wave. The element is composed of two orthogonal helical linear zone plates. By considering their topological charge, various structured beams are generated, exhibiting fascinating dynamics. Phenomena observed during the propagation of the beam include structure transformation, vortex pair production and annihilation, as well as the interaction between dipole and singular vortices. Additionally, the study highlights the interaction of screw dislocations, where they approach each other as the diffracted beam propagates towards the focus and move apart as the beam diverges from the focus.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Haleh Ebrahimi, Arash Sabatyan
Summary: This paper presents a novel composite diffractive element that can generate a wide range of beam patterns and structures by redesigning the spiral zone plate and incorporating a complex sinusoidal grating. Additionally, this element functions as a multi-focusing component, enabling the creation of diverse optical arrays. Mathematical analysis, simulations, and experimental validation were conducted to support the research findings.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Physics, Multidisciplinary
Haleh Ebrahimi, Arash Sabatyan
Summary: This paper presents a novel approach for generating structured light using a diffractive beam-shaping element that can generate multiple beams with distinct spatial structures in the focal plane. The element combines a spiral zone plate with fork gratings, allowing for tunable and controllable generation of structured light. Various structured beams, including vortices, petal-like beams, and ring-lattice structures, can be created using the proposed element. Mathematical analysis, simulations, and experiments validate the feasibility of the approach.
ANNALEN DER PHYSIK
(2023)
