2,418 research outputs found
Numerical investigation of the Rayleigh hypothesis for electromagnetic scattering by a particle
The validity of the Rayleigh hypothesis has been a long-standing issue in the applicability of the T-matrix method to near-field calculations, and despite numerous theoretical works, the practical consequences for numerical simulations have remained unclear. Such calculations are increasingly important in the field of nanooptics, for which accurate and efficient modeling tools are in high demand. We here tackle this challenge by investigating numerically the convergence behavior of series expansions of the electric field around spheroidal particles, which provides us with unambiguous examples to clarify the conditions of convergence. This study is made possible by the combination of alternative methods to compute near-fields accurately, and crucially, the recent improvements in the calculation of T-matrix elements free from numerical instabilities, as such errors would otherwise obfuscate the intrinsic convergence properties of the field series. The resulting numerical confirmation for the range of validity of the Rayleigh hypothesis, complemented by a better understanding of the convergence behavior of the field expansions, is a crucial step toward future developments
Equidistribution of polynomial sequences in function fields, with applications
We prove a function field analog of Weyl's classical theorem on
equidistribution of polynomial sequences. Our result covers the case when the
degree of the polynomial is greater than or equal to the characteristic of the
field, which is a natural barrier when applying the Weyl differencing process
to function fields. We also discuss applications to van der Corput and
intersective sets in function fields.Comment: 24 page
Stimulated Raman Adiabatic Passage (STIRAP) as a Route to Achieving Optical Control in Plasmonics
Optical properties of ensembles of three-level quantum emitters coupled to
plasmonic systems are investigated employing a self-consistent model. It is
shown that stimulated Raman adiabatic passage (STIRAP) technique can be
successfully adopted to control optical properties of hybrid materials with
collective effects present and playing an important role in light-matter
interactions. We consider a core-shell nanowire comprised of a silver core and
a shell of coupled quantum emitters and utilize STIRAP scheme to control
scattering efficiency of such a system in a frequency and spatial dependent
manner. After the STIRAP induced population transfer to the final state takes
place, the core-shell nanowire exhibits two sets of Rabi splittings with Fano
lineshapes indicating strong interactions between two different atomic
transitions driven by plasmon near-fields.Comment: 11 pages, 6 figures, accepted, Physical Review
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