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Propagation of beams through turbulence. It has been suggested that partiallycoherent beams and vortex beams propagate better in atmospheric turbulence thantraditional Gaussian beams. I coauthored a paper on the spreading of such beamsin turbulence, and confirmed that indeed they have certain advantages over theirfully coherent counterparts. Further studies involve investigations of scintillationproperties of various classes of partially coherent beams, for possible applicationin optical communication systems.
Nano-scale electromagnetics. The discovery of enhanced light transmissionthrough subwavelength holes and the role of surface plasmons in the enhancementhas created new possibilities for subwavelength optical devices. I am undertakingexact numerical simulations of Maxwell’s equations near subwavelength features
in metal plates in order to obtain a deeper understanding of such phenomena, withan eye towards developing novel optical devices.
Singular optics. The phase of an optical field can exhibit unusual behavior in theneighborhood of zeros of intensity, including optical vortices and saddles. Mycollaborators and I demonstrated that drastic spectral changes occur in the vicinityof such phase singularities for polychromatic fields. We are now currentlyinvestigating the properties of phase singularities of coherence functions.
Inverse scattering problems. Methods such as computed tomography which canbe used to create images of three-dimensional objects are of great importance in avariety of applications, including medical imaging, geophysics, materials testing,even archaeology. I have been involved in the development of a new method of diffraction tomography which requires only intensity measurements of thescattered field.
Nonradiating source, optical cloaking, and invisibility. It has been shown thatthere exist solutions to inhomogeneous wave equations which do not produce anyradiation outside the domain of the source, as well as scattering objects that do notproduce a scattered field. My thesis work investigated the properties of suchobjects and determined some new properties of them, particularly for partiallycoherent sources. I continue to investigate cloaks, invisible objects, andnonradiating sources.
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JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISIONno. 3 (2024): 435-443
OPTICS EXPRESSno. 1 (2024): 813-824
William Raburn,Gregory Gbur
Journal of the Optical Society of America A (2024)
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISIONno. 3 (2023): 470-478
OPTICS EXPRESSno. 23 (2023): 38004-38012
arxiv(2023)
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