Arnold D. Kim
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View article: Modeling measurements for quantitative imaging subsurface targets
Modeling measurements for quantitative imaging subsurface targets Open
We study ground-penetrating synthetic aperture radar measurements of scattering by targets located below a rough air-soil interface. By considering the inherent space/angle limitations of this imaging modality, we introduce a simplified mo…
View article: Scattering by nanoplasmonic mesoscale assemblies
Scattering by nanoplasmonic mesoscale assemblies Open
The flexibility and versatility of nanoassembled plasmonic structures provide platforms for mesoscale tunable optical modulation. Our recently developed model for these nanoassembled plasmonic structures is composed of a dielectric spheric…
View article: Synthetic Aperture Radar Imaging Below a Random Rough Surface
Synthetic Aperture Radar Imaging Below a Random Rough Surface Open
Motivated by applications in unmanned aerial based ground penetrating radar for detecting buried landmines, we consider the problem of imaging small point like scatterers situated in a lossy medium below a random rough surface. Both the ra…
View article: Mouse tracking performance: A new approach to analyzing continuous mouse tracking data
Mouse tracking performance: A new approach to analyzing continuous mouse tracking data Open
Mouse tracking is an important source of data in cognitive science. Most contemporary mouse tracking studies use binary-choice tasks and analyze the curvature or velocity of an individual mouse movement during an experimental trial as part…
View article: Hashtags as signals of political identity: #BlackLivesMatter and #AllLivesMatter
Hashtags as signals of political identity: #BlackLivesMatter and #AllLivesMatter Open
We investigate perceptions of tweets marked with the #BlackLivesMatter and #AllLivesMatter hashtags, as well as how the presence or absence of those hashtags changed the meaning and subsequent interpretation of tweets in U.S. participants.…
View article: Synthetic aperture radar imaging below a random rough surface
Synthetic aperture radar imaging below a random rough surface Open
Motivated by applications in unmanned aerial based ground penetrating radar for detecting buried landmines, we consider the problem of imaging small point like scatterers situated in a lossy medium below a random rough surface. Both the ra…
View article: Synthetic aperture radar imaging below a random rough surface
Synthetic aperture radar imaging below a random rough surface Open
Motivated by applications in unmanned aerial based ground penetrating radar for detecting buried landmines, we consider the problem of imaging small point like scatterers situated in a lossy medium below a random rough surface. Both the ra…
View article: Imaging in lossy media
Imaging in lossy media Open
We study the effects of absorption in the medium on synthetic aperture imaging. We model absorption using the loss tangent, which is the imaginary part of the relative dielectric permittivity, and study two cases: (i) the loss tangent is k…
View article: Synthetic aperture imaging of dispersive targets
Synthetic aperture imaging of dispersive targets Open
We introduce a dispersive point target model based on scattering by a particle in the far-field. The synthetic aperture imaging problem is then expanded to identify these targets and recover their locations and frequency dependent reflecti…
View article: Dynamics of acoustically bound particles
Dynamics of acoustically bound particles Open
It is well known that scattering from acoustic fields can produce forces on single particles; however, they can also induce interparticle forces due to multiple scattering events. This multiparticle force—here referred to as acoustic bindi…
View article: Tunable High‐Resolution Synthetic Aperture Radar Imaging
Tunable High‐Resolution Synthetic Aperture Radar Imaging Open
We have recently introduced a modification of the multiple signal classification method for synthetic aperture radar. This method incorporates a user‐defined parameter, ϵ , that allows for tunable quantitative high‐resolution imaging. Howe…
View article: Tunable high-resolution synthetic aperture radar imaging
Tunable high-resolution synthetic aperture radar imaging Open
We have recently introduced a modification of the multiple signal classification (MUSIC) method for synthetic aperture radar. This method depends on a tunable, user-defined parameter, ε, that allows for quantitative high-resolution imaging…
View article: High-Resolution, Quantitative Signal Subspace Imaging for Synthetic Aperture Radar
High-Resolution, Quantitative Signal Subspace Imaging for Synthetic Aperture Radar Open
We consider synthetic aperture radar imaging of a region containing point-like targets. Measurements are the set of frequency responses to scattering by the targets taken over a collection of individual spatial locations along the flight p…
View article: Tunable high-resolution synthetic aperture radar imaging
Tunable high-resolution synthetic aperture radar imaging Open
We have recently introduced a modification of the multiple signal classification (MUSIC) method for synthetic aperture radar. This method depends on a tunable, user-defined parameter, $ε$, that allows for quantitative high-resolution imagi…
View article: Asymptotic analysis for sound-hard acoustic scattering by two closely-situated spheres
Asymptotic analysis for sound-hard acoustic scattering by two closely-situated spheres Open
International audience
View article: Capturing plasmonic behaviors in light scattering by spheres using finite element methods and asymptotic quadrature
Capturing plasmonic behaviors in light scattering by spheres using finite element methods and asymptotic quadrature Open
International audience
View article: Quadrature by Parity Asymptotic eXpansions (QPAX) for light scattering by high aspect ratio plasmonic particle
Quadrature by Parity Asymptotic eXpansions (QPAX) for light scattering by high aspect ratio plasmonic particle Open
International audience
View article: Hashtags as Signals of Political Identity: #BlackLivesMatter and #AllLivesMatter
Hashtags as Signals of Political Identity: #BlackLivesMatter and #AllLivesMatter Open
We investigate partisan perceptions of tweets marked with the #BlackLivesMatter and #AllLivesMatter hashtags, as well as how the presence or absence of those hashtags changed the meaning and subsequent interpretation of those tweets in U.S…
View article: High-resolution, quantitative signal subspace imaging for synthetic aperture radar
High-resolution, quantitative signal subspace imaging for synthetic aperture radar Open
We consider synthetic aperture radar imaging of a region containing point-like targets. Measurements are the set of frequency responses to scattering by the targets taken over a collection of individual spatial locations along the flight p…
View article: Dynamics of Acoustically Bound Particles
Dynamics of Acoustically Bound Particles Open
It is well known that acoustic fields can produce forces on single particles, however they can also induce inter-particle forces due to multiple scattering events. This multi-particle force -- here referred to as acoustic binding -- is com…
View article: Quantitative signal subspace imaging
Quantitative signal subspace imaging Open
We develop and analyze a quantitative signal subspace imaging method for single-frequency array imaging. This method is an extension to multiple signal classification which uses (i) the noise subspace to determine the location and support …
View article: Quadrature by Parity Asymptotic eXpansions (QPAX) for Scattering by High Aspect Ratio Particles
Quadrature by Parity Asymptotic eXpansions (QPAX) for Scattering by High Aspect Ratio Particles Open
We study scattering by a high aspect ratio particle using boundary integral equation methods. This problem has important applications in nanophotonics problems, including sensing and plasmonic imaging. Specifically, we consider scattering …
View article: Modeling broadband cloaking using 3D nano-assembled plasmonic meta-structures
Modeling broadband cloaking using 3D nano-assembled plasmonic meta-structures Open
The concept of “cloaking” an object is a very attractive one, especially in the visible (VIS) and near infra-red (NIR) regions of the electromagnetic spectrum, as that would reduce the visibility of an object to the eye. One possible route…
View article: Asymptotic approximations for the close evaluation of double-layer potentials
Asymptotic approximations for the close evaluation of double-layer potentials Open
When using the boundary integral equation method to solve a boundary value problem, the evaluation of the solution near the boundary is challenging to compute because the layer potentials that represent the solution are nearly-singular int…
View article: Quantitative subsurface imaging in strongly scattering media
Quantitative subsurface imaging in strongly scattering media Open
We present a method to obtain quantitatively accurate images of small obstacles or inhomogeneities situated near the surface of a strongly scattering medium. The method uses time-resolved measurements of backscattered light to form the ima…
View article: Close evaluation of layer potentials in three dimensions
Close evaluation of layer potentials in three dimensions Open
We present a simple and effective method for evaluating double-and single-layer potentials for Laplace's equation in three dimensions close to the boundary. The close evaluation of these layer potentials is challenging because they are nea…