Polarization bremsstrahlung of fast electrons on metal nanospheres in a dielectric matrix in view of plasmon interference effects

• Published in: Journal of physics. Conference series Vol. 732; no. 1; pp. 12025 - 12031
• Main Authors: Astapenko, V A, Sakhno, S V, Krotov, Yu A
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.07.2016
• Subjects: Angular distribution; Bremsstrahlung; Dipoles; Electrons; Interference; Metal particles; Mie scattering; Nanospheres; Photons; Physics; Polarization; Quadrupoles; Radiation; Spectral emittance
• DOI: 10.1088/1742-6596/732/1/012025
• ISSN: 1742-6588

The paper is devoted to the theoretical analysis of polarization bremsstrahlung (PB) [1] due to scattering of fast electrons by a metal nanosphere embedded in a dielectric matrix in a frequency region in the vicinity of dipole and quadrupole plasmon resonances. Here we take into account plasmon interference effects that arise in the frequency-angular distribution of PB. These effects are a consequence of interrelation between contributions to PBs due to a plasmon on the sphere surface of different multipolarity. Our approach is based on the Fermi method of equivalent photons [2] and the Mie theory of radiation scattering by small metal particles [3]. It is shown that taking into account plasmon interference in the PB differential cross-section results in specific features in the spectral distribution of an emitted photon that depend strongly on the radiation angle and nanosphere radius.