Search results
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Title
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A Detailed Description of Keldysh's Model of Photoionization
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Author
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Darden, Kenan
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Date Created
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2023
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Subjects--Topical
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Physics, Optics, Quantum theory
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Description
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Leonid Keldysh’s 1965 paper "Ionization in the Field of a Strong Electromagnetic Wave" contains useful and simple-to-implement equations predicting the rate of photoionization in both atomic gasses and general crystalline solids. Crucially, his re...
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Title
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A MODIFIED SELF-INTERFERENCE BASED INCOHERENT DIGITAL HOLOGRAPHIC RECORDING SYSTEM
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Author
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Mishra, Abhinav
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Date Created
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2019
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Subjects--Topical
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Mechanical engineering, Optics
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Description
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A Fresnel-type self-interference based incoherent digital holographic system that can measure the intensity and direction of incoming light field is proposed. This system is composed primarily of a convex lens as an objective, a linear polarizer, ...
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Title
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An all optical approach for comprehensive in-operando analysis of radiative and nonradiative recombination processes in GaAs double heterostructures
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Author
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Zhang, Y. (Yong), 1960-, Zhang, Fan, Castaneda, Jose, Gfroerer, Timothy, Friedman, Daniel, Zhang, Yong-Hang, Wanlass, Mark W.
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Subjects--Topical
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Optics, Photoluminescence
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Description
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We demonstrate an all optical approach that can surprisingly offer the possibility of yielding much more information than one would expect, pertinent to the carrier recombination dynamics via both radiative and nonradiative processes when only one...
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Title
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Controlled coherence plasmonic light sources
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Author
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Gbur, Greg, Smith, Matt
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Date Created
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2021
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Subjects--Topical
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Physics, Optics
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Description
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Through a computational model, we study the coherence converting capabilities of an array of holes in a surface plasmon-supporting metal plate, with an eye towards the creation of controlled coherence plasmonic light sources. We evaluate how the a...
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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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DUAL PROJECTION FRINGE PROJECTION PROFILOMETRY
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Author
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Venkatesh, Bhanu teja
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Date Created
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2019
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Subjects--Topical
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Optics, Engineering, Three-dimensional modeling
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Description
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Fringe-pattern projection (FPP) techniques are widely used for surface-shape measurement in a wide range of applications like object and scene modeling, part inspection, and reverse engineering. This thesis presents a way to increase the accuracy ...
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Title
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Design for Metrology of Freeform Optics
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Author
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Venditti, Kristen
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Date Created
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2020
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Subjects--Topical
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Mechanical engineering, Optics, Engineering
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Description
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Freeform optics offer significant advantages over the conventional aspheric optics, but pose new challenges in metrology and manufacturing. The spatial frequencies of an optical surface that must be measured have changed due to the progression of ...
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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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FREEFORM MEASUREMENT WITH STITCHING TALBOT INTERFEROMETER
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Author
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Furukawa, Yasunori
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Date Created
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2018
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Subjects--Topical
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Optics
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Description
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Freeform optics are being used in many fields to realize the outstanding performance due to their high degree of freedom. To realize sufficiently high performance, it is necessary to manufacture the freeform surface with high accuracy, which requi...
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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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High order plasmonic vortex generation based on spiral nanoslits
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Author
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Gbur, Greg, Yu, Jiayi, Fang, Jing, Cai, Yangjian
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Date Created
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2021
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Subjects--Topical
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Physics, Optics
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Description
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Highly localized plasmonic vortices carrying orbital angular momentum are of importance for many applications. Yet, it is a challenge to generating plasmonic vortex with a high topological charge because of no available technique. Here, a novel pl...
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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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OPTICAL INSTRUMENTATION USING GEOMETRIC PHASE ELEMENTS
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Author
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Light, Alyson
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Date Created
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2020
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Subjects--Topical
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Mechanical engineering, Optics, Engineering
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Description
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Traditional optical instrumentation typically requires a controlled, stable environment, and this limits systems to a laboratory setting. For in-situ metrology applications and outdoor measurements, novel methods that are compact and stable are re...
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Title
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OPTICAL METROLOGY OF FREEFORM OPTICS UTILIZING INTERFEROMETRIC STITCHING
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Author
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Hovis, Clark
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Date Created
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2019
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Subjects--Topical
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Mechanical engineering, Optics, Engineering
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Description
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The utilization of interferometric stitching with coherence scanning interferometers has allowed these instruments to measure much larger areas than a single site measurement would permit. This has a major impact on the measurement of mid-spatials...
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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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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...
