| 摘要 |
Determining an electromagnetic response of a sample structure having a predetermined bulk permittivity and permeability, to electron and radiation pulses, comprises calculating (S11) an electron pulse response of the sample structure to an electron pulse excitation, using a finite-difference time-domain method, wherein the electron pulse excitation is represented by a non-singular current source driven by relativistic moving non-Coulombian electron charges, the electron pulse response is calculated on the basis of an interaction of the electron pulse excitation with electromagnetic modes of the sample structure at the laboratory frame, and the electron pulse response depends on the bulk permittivity and permeability of the sample structure, calculating (S12) a radiation response of the sample structure to an electromagnetic radiation excitation, using a finite-difference time-domain method, wherein the radiation response depends on the bulk permittivity and permeability of the sample structure, and providing (S13) the electromagnetic response of the sample structure by superimposing the electron pulse response and the radiation response, wherein the electromagnetic response comprises electron-energy-loss spectra and/or an experienced phase of electron wave functions after interacting with photons of the electromagnetic radiation excitation. Furthermore, a method and a measuring apparatus for investigating a sample structure are described. |
