Investigation on the special Smith-Purcell radiation from a nano-scale rectangular metallic grating

Abstract

The special Smith-Purcell radiation (S-SPR), which is from the radiating eigen modes of a grating, has remarkable higher intensity than the ordinary Smith-Purcell radiation. Yet in previous studies, the gratings were treated as perfect conductor without considering the surface plasmon polaritons (SPPs) which are of significance for the nano-scale gratings especially in the optical region. In present paper, the rigorous theoretical investigations on the S-SPR from a nano-grating with SPPs taken into consideration are carried out. The dispersion relations and radiation characteristics are obtained, and the results are verified by simulations. According to the analyses, the tunable light radiation can be achieved by the S-SPR from a nano-grating, which offers a new prospect for developing the nano-scale light sources.

Spectrally and Spatially Resolved Smith-Purcell Radiation in Plasmonic Crystals with Short-Range Disorder

“…[30][31][32]), with recent work (e.g., Ref. [33]) detailing an analytic theory that gives quite good agreement with full electromagnetic simulations. Plasmonic structures are of special interest in this context because their interaction with free electrons can, in principle, involve strongly localized resonances in addition to the Smith-Purcell-like collective excitations.…”

“…3(e)], respectively. Notice that no conventional electromagnetic simulation can capture the entire effect since emission from local excitations (e.g., CL) cannot be modeled by Maxwell's equations alone [33]. Instead, this effect requires some model of the electronic transitions in the material.…”

Harnessing Evanescent Waves by Bianisotropic Metasurfaces

“…[10][11][12][13] Rationally designed structures, such as photonic crystals, metamaterials and plasmonic nanostructures, offer unprecedented means to tailor electronphoton interactions and hence control the electron-induced emission. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] In spite of these exciting development, so far, few works have discussed the phase, polarization and beam profile control of electron-induced emission, [32] which are essential for tunable, on-chip, free-electron-driven light sources without additional bulky optical components.…”