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Optical diffraction radiation from a dielectric and a metal nanowire excited by a modulated electron beam
摘要： The optical diffraction radiation that accompanies the motion of a modulated beam of electrons near a dielectric and silver nanowire scatterers is investigated in the two-dimensional formulation. Our goal is to compute the field in the near and far zones and analyze how it depends on electron beam parameters. We demonstrate the excitation of internal resonances of such a scatterer that can be useful in the design of nanoscale non-invasive beam position monitors.
关键词： Plasmon resonance,Diffraction radiation,Nanowire scatterers,Total scattering cross-section,Absorption cross-section,Smith–Purcell effect,Surface wave
更新于2025-09-23 15:22:29
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Visible light from modulated electron beam moving between twin circular silver nanowires forming plasmonic photonic molecule
摘要： The visible-range diffraction radiation of harmonically modulated electron beam, which moves between twin circular silver nanowires is considered. The electromagnetic field of such a two-dimensional beam is a surface wave propagating along its trajectory with the phase velocity equal to the beam velocity. This wave induces currents on the nanowires and hence radiation occurs even if the beam does not touch the wires. If the wires are tuned to a resonance, the radiated power displays a peak proportional to the resonant mode Q-factor. Sub-wavelength in radius silver nanowires are famous as nanoresonators due to the localized surface-plasmon modes. In our analysis, we use the field expansions in the azimuthal Fourier series and the addition theorems for the cylindrical functions. This enables us to reduce the wave scattering problem to a Fredholm second kind infinite-matrix equation that guarantees convergence of numerical solutions. Truncating this matrix, we compute the near and far field patterns of the wires as optically coupled plasmonic resonators and analyse dependence of the far-field spectral characteristics on the wavelength and electron beam parameters.
关键词： absorption cross-section,optical diffraction radiation,total scattering cross-section,plasmon resonance,surface wave,silver nanowires
更新于2025-09-12 10:27:22
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[IEEE 2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED) - Tbilisi, Georgia (2018.9.24-2018.9.27)] 2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED) - Optical Diffraction Radiation of a Beam of Particles Flowing Near a Circular Silver Nanowire
摘要： The optical diffraction radiation that accompanies the motion of a modulated beam of electrons near a silver nanowire scatterer is investigated in the two-dimensional formulation. Our goal is to compute the field in the near and far zones and analyze how it depends on electron beam parameters. We demonstrate the excitation of plasmon resonances of such a nanoscale scatterer that can be used in the design of optical range non-invasive beam position monitors.
关键词： plasmon resonance,diffraction radiation,surface wave,total scattering cross-section,nanowire scatterers,absorption cross-section
更新于2025-09-10 09:29:36
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The Noise Level of Total Scattering Cross Section Measurement in a Reverberation Chamber
摘要： A chamber can be used to measure the total scattering cross section (TSCS) of an object, in which the time-domain response needs to be analyzed to extract the scattering damping time. It has been observed in measurements that the noise level in extracting the scattering damping time is much higher than that in extracting the chamber decay time. The reasons behind this phenomenon are explored in this letter. Analytical distributions of the noise in TSCS measurements are derived and validated by measurements. Good agreements between analytical results and measurement results have been obtained, which gives guidelines on the prediction of noise level and the required independent sample number in the total scattering cross section measurement.
关键词： scattering damping time,total scattering cross section measurement,Reverberation chamber (RC)
更新于2025-09-10 09:29:36