Search results
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Title
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Partially coherent radially polarized fractional vortex beam
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Author
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Gbur, Greg, Zeng, Jun, Liang, Chunhao, Cai, Yangjian
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Date Created
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2020
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Subjects--Topical
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Physics, Optics
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Description
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A new kind of partially coherent vector beam, named a partially coherent radially polarized fractional vortex (PCRPFV) beam, is introduced as a natural extension of the recently introduced scalar partially coherent fractional vortex beams [Zeng et...
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Title
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Massive parallel sorting of particles using unwound polygonal vortex beams
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Author
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Gbur, Greg
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Date Created
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2022
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Subjects--Topical
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Physics, Optics
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Description
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Optical sorting, as one kind of optical tweezers, is used to separate mixed particles in a background environment. This unusual tool has a wide application prospect because the non-contact and non-destructive advantages ideally suit the pressing n...
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Title
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Propagation of radially polarized Hermite non-uniformly correlated beams in a turbulent atmosphere
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Author
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Gbur, Greg, Yu, Jiayi, Cai, Yangjian, Lin, Rong
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Date Created
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2020
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Subjects--Topical
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Physics, Optics
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Description
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We study the propagation properties of a recently introduced class of structured beams, radially polarized Hermite non-uniformly correlated (RPHNUC) beams, in a turbulent atmosphere using the extended Huygens-Fresnel integral and investigate how t...
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Title
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Rectangular Hermite non-uniformly correlated beams and its propagation properties
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Author
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Gbur, Greg, Yu, Jiayi, Cai, Yangjian
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Date Created
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2018
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Subjects--Topical
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Physics, Optics
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Description
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We introduce a new class of non-uniformly correlated beams that are called rectangular Hermite non-uniformly correlated (RHNUC) beams, which possess rectangular symmetry in their degree of coherence. It is shown that, in free space and in turbulen...
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Title
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Propagation properties of Hermite non-uniformly correlated beams in turbulence
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Author
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Gbur, Greg, Yu, Jiayi
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Date Created
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2018
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Subjects--Topical
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Physics, Optics
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Description
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We study the propagation properties (intensity, degree of coherence and scintillation) of a new class of beams in a turbulent atmosphere, which are called Hermite non-uniformly correlated (HNUC) beams. The results show that the beams not only have...
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Title
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Cycle of phase, coherence and polarization singularities in Young's three-pinhole experiment
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Author
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Gbur, Greg, Pang, Xiaoyan, Visser, Taco D.
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Date Created
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2015
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Subjects--Topical
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Physics, Optics
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Description
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It is now well-established that a variety of singularities can be characterized and observed in optical wavefields. It is also known that these phase singularities, polarization singularities and coherence singularities are physically related, but...
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Title
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Dynamic aerosol and dynamic air-water interface curvature effects on a 2-Gbit/s free-space optical link using orbital-angular-momentum multiplexing
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Author
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Gbur, Greg, Song, Haoqian, Zhang, Runzhou, Hu, Nanzhe
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Date Created
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2022
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Subjects--Topical
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Physics, Optics
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Description
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When an orbital-angular-momentum (OAM) beam propagates through the dynamic air-water interface, the aerosol above the water and the water surface curvature could induce various degradations (e.g., wavefront distortion, beam wandering, scattering, ...
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Title
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Scintillation properties of a partially coherent vector beam with vortex phase in turbulent atmosphere
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Author
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Gbur, Greg, Yu, Jiayi, Cai, Yangjian, Huang, Yan
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Date Created
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2019
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Subjects--Topical
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Physics, Optics
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Description
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We undertake a computational and experimental study of an advanced class of structured beams, partially coherent radially polarized vortex (PCRPV) beams, on propagation through atmospheric turbulence. A computational propagation model is establish...
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Title
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Using superoscillations for superresolved imaging and subwavelength focusing
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Author
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Gbur, Greg
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Subjects--Topical
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Fluctuations (Physics)
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Description
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It is now well-appreciated that a bandlimited wave can possess oscillations much more rapidly than those predicted by the bandlimit itself, in a phenomenon known as superoscillation. Such superoscillations are required to be of dramatically smalle...
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Title
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Singularities of partially polarized vortex beams
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Author
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Gbur, Greg, Raburn, William Scott
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Subjects--Topical
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Optics, Coherence (Optics)
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Description
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Singularities in the polarization state of non-uniform electromagnetic beams have been a topic of both theoretical and practical interest for many years, as have singularities in the correlation functions of random scalar wavefields. However, ther...
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Title
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Spiral spectrum of a Laguerre-Gaussian beam propagating in anisotropic non-Kolmogorov turbulent atmosphere along horizontal path
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Author
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Gbur, Greg, Zeng, Jun, Liu, Xianlong, Cai, Yangjian
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Date Created
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2019
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Subjects--Topical
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Physics, Optics
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Description
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Close to the ground, it is generally known that atmospheric turbulence exhibits strong anisotropy, which affects the performance of applications such as free-space optical (FSO) communication. In this paper, we establish a theoretical model for ca...
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Title
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The evolution of spectral intensity and orbital angular momentum of twisted Hermite Gaussian Schell model beams in turbulence
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Author
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Gbur, Greg, Yu, Jiayi, Cai, Yangjian, Lin, Rong
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Date Created
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2020
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Subjects--Topical
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Physics, Optics
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Description
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We introduce a new class of twisted partially coherent beams with a non-unifirm correlation structure. These beams, called twisted Hermite Gaussian Schell model (THGSM) beams, have a correlation structure related to Hermite functions and a twist f...
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Title
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Fractional vortex Hilbert's Hotel
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Author
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Gbur, Greg
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Date Created
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2016
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Subjects--Topical
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Physics, Optics
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Description
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We demonstrate how the unusual mathematics of transfinite numbers, in particular, a nearly perfect realization of Hilbert's famous hotel paradox, manifests in the propagation of light through fractional vortex plates. It is shown how a fractional ...
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Title
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Simulating fields of arbitrary spatial and temporal coherence
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Author
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Gbur, Greg
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Date Created
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2006
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Subjects--Topical
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Physics, Optics
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Description
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Optical coherence theory typically deals with the average properties of randomly fluctuating fields. However, in some circumstances the averaging process can mask important physical aspects of the field propagation. We derive a new method of simul...
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Title
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Strategies for employing surface plasmons in near-field optical readout systems
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Author
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Gbur, Greg, Gan, Choon How
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Date Created
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2006
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Subjects--Topical
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Physics, Optics
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Description
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The enhanced transmission of light through subwavelength-size holes in a metal plate is well-known to be associated with surface plasmons. We have undertaken a systematic theoretical study of several strategies for applying these plasmon effects i...
