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HomerReid / scuff-em

A comprehensive and full-featured computational physics suite for boundary-element analysis of electromagnetic scattering, fluctuation-induced phenomena (Casimir forces and radiative heat transfer), nanophotonics, RF device engineering, electrostatics, and more. Includes a core library with C++ and python APIs as well as many command-line applications.
http://www.homerreid.com/scuff-em
GNU General Public License v2.0
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Question on the Mie Scattering Example #123

Open xmpan opened 8 years ago

xmpan commented 8 years ago

Hi,

The absorption and scattering data for the Mie example in the tarball differs from that in your published paper (Fig.1, "Efficient Computation of Power, Force, and Torque in BEM Scattering Calculations", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 63, NO. 8, AUGUST 2015) by a constant.

Could you please explain how to scale the data or tell me what is the constant.

Thank you very much.

Kind regards.

HomerReid commented 7 years ago

scuff-scatter reports power quantities in units of Watts (assuming incident-field amplitudes are specified in units of volts/micron). As explained in the caption of Figure 1 and in the main text of the paper you reference, the quantity plotted in Figure 1 is a dimensionless quantity known as the "efficiency," defined as the absorption or scattering cross section of the scatterer divided by the geometric cross section of the scatterer. Formulas for computing absorption and scattering efficiencies are given in the paper.