1
|
Aiello A, Agarwal GS, Paúr M, Stoklasa B, Hradil Z, Řeháček J, de la Hoz P, Leuchs G, Sánchez-Soto LL. Unraveling beam self-healing. OPTICS EXPRESS 2017; 25:19147-19157. [PMID: 29041108 DOI: 10.1364/oe.25.019147] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 07/15/2017] [Indexed: 06/07/2023]
Abstract
We show that, contrary to popular belief, diffraction-free beams may not only reconstruct themselves after hitting an opaque obstacle but also, for example, Gaussian beams. We unravel the mathematics and the physics underlying the self-reconstruction mechanism and we provide for a novel definition for the minimum reconstruction distance beyond geometric optics, which is in principle applicable to any optical beam that admits an angular spectrum representation. Moreover, we propose to quantify the self-reconstruction ability of a beam via a newly established degree of self-healing. This is defined via a comparison between the amplitudes, as opposite to intensities, of the original beam and the obstructed one. Such comparison is experimentally accomplished by tailoring an innovative experimental technique based upon Shack-Hartmann wave front reconstruction. We believe that these results can open new avenues in this field.
Collapse
|
2
|
Porfirev AP, Kirilenko MS, Khonina SN, Skidanov RV, Soifer VA. Study of propagation of vortex beams in aerosol optical medium. APPLIED OPTICS 2017; 56:E8-E15. [PMID: 28414336 DOI: 10.1364/ao.56.0000e8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A theoretical and experimental study of the propagation of vortex laser beams in a random aerosol medium is presented. The theoretical study is based on the extended Huygens-Fresnel principle with the generation of a random field, using the fast Fourier transform. The simulation shows that the stability of vortex beams to fluctuations of an optical medium falls with rising order of optical vortices. Moreover, a coherence length (radius) of the random medium is of great importance. The coherence radius extension affects adversely the conservation of a beam structure in the random medium. During further free-space propagation, increasing coherence enables reduction of the negative effects of fluctuations for beams with high-value topological charges. Experimental studies in the random aerosol medium have shown that at small distances vortex beams mostly demonstrate lower stability than a Gaussian beam. However, at considerable distances, vortex beams start to demonstrate greater stability that may be explained by their capacity to be regenerated after they passed obstacles.
Collapse
|
3
|
Angelsky OV, Felde CV, Polyanskii PV. Some current views on the origins and prospects of correlation optics. APPLIED OPTICS 2016; 55:B36-B43. [PMID: 27140128 DOI: 10.1364/ao.55.000b36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 12/21/2015] [Indexed: 06/05/2023]
Abstract
The state of the art modern branch of optics and photonics now referred to as correlation optics is discussed in connection with both its origins and promising prospects. We use here the term "correlation" not only as a synonym of the term "coherence," but also for emphasizing the necessity of taking into account fine, sometimes enigmatic, phase relations among the components of complex optical fields, even if such fields are conventionally defined as completely coherent. Selection of topics for this brief review of correlation optics outlooks was not dictated by intention of comprehensive representation of this field of research, but rather by the scientific interests of the authors, ranging from classical theory of diffraction, holography, and light-scattering to modern singular optics.
Collapse
|
4
|
Angelsky OV, Bekshaev AY, Maksimyak PP, Maksimyak AP, Mokhun II, Hanson SG, Zenkova CY, Tyurin AV. Circular motion of particles suspended in a Gaussian beam with circular polarization validates the spin part of the internal energy flow. OPTICS EXPRESS 2012; 20:11351-11356. [PMID: 22565755 DOI: 10.1364/oe.20.011351] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Non-spherical dielectric microparticles were suspended in a water-filled cell and exposed to a coherent Gaussian light beam with controlled state of polarization. When the beam polarization is linear, the particles were trapped at certain off-axial position within the beam cross section. After switching to the right (left) circular polarization, the particles performed spinning motion in agreement with the angular momentum imparted by the field, but they were involved in an orbital rotation around the beam axis as well, which in previous works [Y. Zhao et al, Phys. Rev. Lett. 99, 073901 (2007)] was treated as evidence for the spin-to orbital angular momentum conversion. Since in our realization the moderate focusing of the beam excluded the possibility for such a conversion, we consider the observed particle behavior as a demonstration of the macroscopic "spin energy flow" predicted by the theory of inhomogeneously polarized paraxial beams [A. Bekshaev et al, J. Opt. 13, 053001 (2011)].
Collapse
Affiliation(s)
- O V Angelsky
- Correlation Optics Department, Chernivtsi National University, Chernivtsi, Ukraine.
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Angelsky OV, Bekshaev AY, Maksimyak PP, Maksimyak AP, Hanson SG, Zenkova CY. Orbital rotation without orbital angular momentum: mechanical action of the spin part of the internal energy flow in light beams. OPTICS EXPRESS 2012; 20:3563-3571. [PMID: 22418116 DOI: 10.1364/oe.20.003563] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The internal energy flow in a light beam can be divided into the "orbital" and "spin" parts, associated with the spatial and polarization degrees of freedom of light. In contrast to the orbital one, experimental observation of the spin flow seems problematic because it is converted into an orbital flow upon tight focusing of the beam, usually applied for energy flow detection by means of the mechanical action upon probe particles. We propose a two-beam interference technique that results in an appreciable level of spin flow in moderately focused beams and detection of the orbital motion of probe particles within a field where the transverse energy circulation is associated exclusively with the spin flow. This result can be treated as the first demonstration of mechanical action of the spin flow of a light field.
Collapse
Affiliation(s)
- O V Angelsky
- Correlation Optics Department, Chernivtsi National University, 2, Kotsyubinsky Str., Chernivtsi 58012, Ukraine.
| | | | | | | | | | | |
Collapse
|
6
|
Vyas S, Kozawa Y, Sato S. Self-healing of tightly focused scalar and vector Bessel-Gauss beams at the focal plane. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2011; 28:837-843. [PMID: 21532695 DOI: 10.1364/josaa.28.000837] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The property of self-healing at the focal plane for both scalar and vector Bessel-Gauss (BG) beams is investigated in the tight focusing condition. For the BG beam, which is partially obstructed at the pupil plane, the spatial intensity distribution at the focal plane is well recovered. Furthermore, recovery of not only intensity but also polarization distribution is observed for an obstructed vector BG beam. This self-healing effect for both the intensity and polarization components is recognized even when the half of the beam is obstructed by a semicircular obstacle. The effect of the size of the obstacle on recovery of polarization and intensity distribution is studied. The role of the beam size at the pupil plane is also discussed.
Collapse
Affiliation(s)
- Sunil Vyas
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.
| | | | | |
Collapse
|
7
|
Milne G, Jeffries GDM, Chiu DT. Tunable generation of Bessel beams with a fluidic axicon. APPLIED PHYSICS LETTERS 2008; 92:261101. [PMID: 19529839 PMCID: PMC2682746 DOI: 10.1063/1.2952833] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Accepted: 06/09/2008] [Indexed: 05/20/2023]
Abstract
This paper describes a tunable fluidic conical lens, or axicon, for the generation and dynamic reconfiguration of Bessel beams. When illuminated with a Gaussian laser beam, our fluidic axicon generates a diverging beam with an annular cross section. By varying the refractive index of the solution that fills our device, we can vary easily the spatial properties of the resulting Bessel beam.
Collapse
Affiliation(s)
- Graham Milne
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, USA
| | | | | |
Collapse
|
8
|
Izdebskaya Y, Shvedov V, Volyar A. Symmetric array of off-axis singular beams: spiral beams and their critical points. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2008; 25:171-181. [PMID: 18157224 DOI: 10.1364/josaa.25.000171] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We consider conditions of structural stability under which the array of singular beams preserves its topological structure and intensity distribution while slightly perturbing its intrinsic parameters. The orbital angular momentum of the array as a function of the array parameters is a characteristic function, and its extreme points correspond to stable and unstable array states.
Collapse
Affiliation(s)
- Yana Izdebskaya
- Department of Physics, Taurida National V. Vernandsky University, Vernadsky Av. 4, Simferopol 95007, Crimea, Ukraine
| | | | | |
Collapse
|
9
|
Burnham DR, Wright GD, Read ND, McGloin D. Holographic and single beam optical manipulation of hyphal growth in filamentous fungi. ACTA ACUST UNITED AC 2007. [DOI: 10.1088/1464-4258/9/8/s09] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
10
|
Vennes M, Martin S, Gisler T, Zentel R. Anisotropic Particles from LC Polymers for Optical Manipulation. Macromolecules 2006. [DOI: 10.1021/ma0613279] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Melanie Vennes
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55099 Mainz, and Department of Physics-Fach M621, University of Konstanz, D-78457 Konstanz, Germany
| | - Stephen Martin
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55099 Mainz, and Department of Physics-Fach M621, University of Konstanz, D-78457 Konstanz, Germany
| | - Thomas Gisler
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55099 Mainz, and Department of Physics-Fach M621, University of Konstanz, D-78457 Konstanz, Germany
| | - Rudolf Zentel
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55099 Mainz, and Department of Physics-Fach M621, University of Konstanz, D-78457 Konstanz, Germany
| |
Collapse
|
11
|
Fernández-Nieves A. Engineering colloids with optical and geometrical anisotropies: de-coupling size monodispersity and particle properties. SOFT MATTER 2006; 2:105-108. [PMID: 32646134 DOI: 10.1039/b512441g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This paper gives an overview of our recent work on liquid crystal emulsions and their use as starting point towards making monodisperse suspensions of colloidal entities with optical and geometrical anisotropies. The procedure utilizes a monodisperse emulsion of a photopolymerizable liquid crystal that is polymerized after mechanical deformation of the drops. We have engineered solid spheres as well as oblate and prolate spheroids presenting a bipolar anisotropic character at the micrometer scale. These materials respond to optical and external electric fields by aligning their mean optic axis parallel to the field, thus constituting excellent systems for fundamental studies and applied uses.
Collapse
Affiliation(s)
- Alberto Fernández-Nieves
- Group of Complex Fluids Physics, Department of Applied Physics,, University of Almería, Almería, 04120, Spain.
| |
Collapse
|