Journal ArticleDOI
Generation of annular beam by a novel class of Fresnel zone plate
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TLDR
A type of Fresnel zone plate in which its phase is shifted radially outward can easily and precisely turn an incident plane wave into an annular beam at its focal plane and the width of the annulus is a function of focal length.Abstract:
We introduce a type of Fresnel zone plate (FZP) in which its phase is shifted radially outward. This FZP can easily and precisely turn an incident plane wave into an annular beam at its focal plane. High efficiency and flexibility are the advantages of generating doughnut beams by this method. By performing direct calculations and using Bessel function properties, it is shown that a radially shifted zone plate produces annulus focus. Furthermore, by simulating the modified phase structure, in addition to demonstrating the formation of a ring-shaped focus, we also showed that its radius merely depends on the amount of the shift. We also showed that the width of the annulus is a function of focal length. Simulation results were thoroughly examined by experiments. Finally, it is clearly revealed that at a certain distance from the focal plane along the beam propagation, an annular beam is transformed into a Bessel beam, and a focal line is formed.read more
Citations
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Journal ArticleDOI
Superoscillation: from physics to optical applications.
TL;DR: Recent developments in optical ‘superoscillation’ technologies are reviewed, which aim to overcome current limitations in superresolution techniques requiring contact with the observed object, the use of fluorescent labels, or viewing that is restricted to the near-field of a lens.
Journal ArticleDOI
Photosensitive chalcogenide metasurfaces supporting bound states in the continuum
Elena Mikheeva,Kirill Koshelev,Duk-Yong Choi,Sergey Kruk,Julien Lumeau,Redha Abdeddaim,Ivan Voznyuk,Stefan Enoch,Yuri S. Kivshar +8 more
TL;DR: In this paper, the authors explore the use of arsenic trisulfide (a photosensitive chalcogenide glass) having optical properties which can be finely tuned by light absorption at the post-fabrication stage.
Journal ArticleDOI
Modern Types of Axicons: New Functions and Applications.
TL;DR: In this paper, four different and special approaches for creating nondiffracting beams in axicons are compared: Diffractive axicons, meta-axicons-flat optics, spatial light modulators, and photonic integrated circuit-based axicons.
Journal ArticleDOI
Azimuthal phase-shifted zone plates to produce petal-like beams and ring lattice structures
Arash Sabatyan,Jila Rafighdoost +1 more
TL;DR: In this article, two models of spiral zone plate-based diffractive elements are presented to generate petal-like and optical ring lattice beams, which are named azimuthal phase-shifted zone plates.
Journal ArticleDOI
Synthesis of sub-diffraction quasi-non-diffracting beams by angular spectrum compression.
Shuo Zhang,Hao Chen,Zhixiang Wu,Kun Zhang,Yuyan Li,Gang Chen,Zhihai Zhang,Zhongquan Wen,Luru Dai,and Lingfang Wang +9 more
TL;DR: A method based on the idea of compressing a normalized angular spectrum is developed, which makes it possible and provides a practical tool for the design of a quasi-non-diffracting beam with super-oscillatory sub-wavelength transverse size.
References
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Journal ArticleDOI
The Axicon: A New Type of Optical Element
TL;DR: The axicon autocollimator as discussed by the authors is a projector which projects a straight line of images into space, and it can be used to determine the perpendicularity of a mirror.
Journal ArticleDOI
Bessel and annular beams for materials processing
TL;DR: In this paper, proper-ties, generation methods and emerging applications for non-Gaussian beam shapes are discussed, including Bessel, an-nular, and vortex beams.
Journal ArticleDOI
Axicons and Their Uses
TL;DR: The most common axicon is a flat cone as mentioned in this paper, where a small source of light on the axis of the cone is imaged into a line along a portion of the axis, and the resulting axicon telescope may be used in aligning machinery such as paper mills.
Journal ArticleDOI
Generation of a Diffraction-Free Laser Beam Using a Specific Fresnel Zone Plate
TL;DR: In this article, a diffraction-free, high-efficiency light beam has been generated using a specific Fresnel zone plate and a suitable convex lens, and the principle and experimental results are given.
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