Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"Discrete-dipole approximation"”.
-
A Study of GPR Performance in the Presence of Buried Biomass
… with roots. For the numerical simulations, the discrete dipole approximation (DDA) was employed to model scattering from roots in a homogeneous medium. Slight modifications permitted it to model the GPR data. Comparisons of the DDA code's results against those of well-known codes and various …
-
An analysis of cryovolcano plumes on Enceladus by light scattering and polarimetry
… simulated by light scattering codes Amsterdam Discrete Dipole Approximation (ADDA) and T-Matrix for both single scattering and using a multiple-scattering approximation. The Pearson correlation coefficient is used to quantify the fit of each morphology to the Cassini data in the clear CLR (611 …
-
Engineering the Optical Properties of Gold Nanostructures for Biomedical Applications
… Au nanoframes were developed. With a series of discrete dipole approximation calculations: DDA), I illustrated how the edge length and ridge thickness of the nanoframe can affect the LSPR peak. I validated the calculated predictions by experimental measurements. I functionalized the surface of …
-
Study of Copper Nanowires With Five-Twinned Structure Grown by Chemical Vapor Deposition and Their Applications
… of CuNWs were measured and verified by the discrete dipole approximation (DDA) simulation. The optical tunability of the CuNWs with respect to the aspect ratio might enable us to use their optical characteristics as optical modulating tools or optical filters.
-
Fast algorithms for small particle scattering problems
… are surface and volume integral equations. Discrete dipole approximation (DDA) is an alternate and useful discretization technique to solve these problems where the continuum scatterer is replaced by a set of polarizable dipoles. It is an alternative to volume integral equations and produces …
-
A physical model to estimate snowfall over land using microwave measurements
… supercooled water in the upper atmosphere.The Discrete Dipole Approximation (DDA) method was employed to generate the single scattering parameters for nonspherical snow crystals. Comparisons show that neither equivalent spheres nor dielectric mixing theories could account for all measurements. …
-
Magneto-Optic Spectroscopy and Near-Field Optical Coupling in Nanoparticle Composite Materials
… A theory is presented based on the dipole approximation which accounts for optical coupling between magnetite particles. Qualitative correlations between theoretical calculations and experimental data suggest the shifts in spectral peak position depend on both interparticle distance …
-
Towards sustainable plasmonics: a study on the shapes and plasmonic properties of magnesium nanoparticles
… Here, electromagnetic simulations in the discrete dipole approximation and single-particle dark-field scattering measurements are employed to unravel size, shape and environment effects in the near-field and far-field optical response of the nanoparticles. Finally, a summary and a …
-
Optical Nanoantennas for Ultrafast Nonlinear Spectroscopy of Individual Nanosystems
… wir einen Punkt-Dipol Ansatz auf Basis der ’Discrete Dipole Approximation’, um im Weiteren besonderen Wert auf die elementaren Wechselwirkungsmechanismen zwischen Nanopartikel und Antenne zu legen. Weiterhin erlaubt uns der stark reduzierte Rechenaufwand riesige, zuvor unzugängliche …
-
Transformations in inorganic nanomaterials: role of defects, surfaces, and size
As our ability to synthesize and manipulate nanomaterials increases, so does our ability to investigate the properties and transformations of materials as they evolve in size from precise clusters akin to molecules to extended solids exhibiting bulk-like properties. In this thesis, we look at a how …
-
Interferometric Scattering Microscopy: Theory, Simulation, and Experiment
How fast does a nanomachine move? Can we watch it moving, if we can see it at all? What types of movements can we track at the nanoscale, and to what degree of spatial and temporal precision? My thesis seeks to develop the necessary theoretical and experimental framework to answer these questions …