Abstract. More detailed observational capabilities in the microwave (MW) range and advancements details of microphysical schemes for ice snow demand increasing complexity to be included scattering databases. The majority existing databases rely on discrete dipole approximation (DDA) whose high computational costs limit either variety particle types or parameters included, such as frequency, tem...

The influence of aspect ratio and orientation to scattering properties of ellipsoid ice particles at 94GHz is studied by Discrete-Dipole Approximation (DDA) method. Absorption efficiency, scattering efficiency, asymmetry factor and backscattering efficiency are computed with aspect ratios vary from 0.2 to 1.0, whose size parameter range are selected from 0 to 5. It is found that the values of s...

Abstract High aspect-ratio gold nanostructures sustain Fabry–Perot-like surface plasmon responses from infrared to visible light energies. We show that some resonances can be tuned by means of laser irradiation, where low energy modes stay unperturbed. After nanowires’ tips are transformed into nanoparticles various sizes joint nanowires, producing high half-dumbbells and dumbbells structures. ...

In this study, the spherical particle model and ten nonspherical models describing scattering properties of snow are evaluated for potential use in precipitation estimation from spaceborne dual-frequency radar. The single particles computed using discrete dipole approximation (DDA), while those determined Mie theory. profiles WRF output then input to a forward radiative transfer simulate radar ...

Nanowire arrays are promising man-made materials for tuning the spectrum and magnitude of near-field thermal radiation. Near-field radiative properties nanowire often studied using effective medium theory (EMT). In this paper, we inspect validity Maxwell-Garnett (MG) Bruggeman (BR) EMTs predicting emission by quartz indium tin oxide (ITO) arrays. The energy density predicted is compared with nu...

In this paper we examine the effect of solvent on the optical extinction spectrum of periodic arrays of surfaceconfined silver nanoparticles fabricated by nanosphere lithography (NSL). By use of NSL, it is possible to systematically vary the out-of-plane height of the nanoparticles, and by thermal annealing, we can control the nanoparticle shape. We have studied four separate samples of nanopar...

DDscat.C++ 7.3.0 is a freely available open-source C++ software package applying the “discrete dipole approximation” (DDA) to calculate scattering and absorption of electromagnetic waves by targets with arbitrary geometries and a complex refractive index. DDscat.C++ is a clone of well known DDSCAT Fortran-90 software. We refer to DDSCAT as to the parent code in this document. Versions 7.3.0 of ...

Design of thermal metamaterials beyond the effective medium theory: Direct numerical simulation via the Thermal Discrete Dipole Approximation (T-DDA) 1. INTRODUCTION 1.1. Objective, broader impacts and intellectual merit The objective of this research is to establish a computational toolbox for designing metamaterials, with user-defined thermal radiative properties, beyond the effective medium ...