Inverse Smith-Purcell effect near rough surfaces

TL;DR

This paper investigates how electrons absorb photons near rough surfaces, revealing that diffusional scattering significantly enhances absorption probability, especially at infrared wavelengths, with implications for spectroscopy and laser acceleration.

Contribution

It provides a detailed analysis of photon absorption by electrons near rough surfaces, highlighting the impact of diffusional scattering and optimal conditions for maximal absorption.

Findings

Diffusional contribution greatly increases absorption probability.

Maximum absorption occurs at infrared wavelengths.

Surface profile and particle energy strongly influence absorption.

Abstract

Absorption of a photon by an electron moving parallel to a rough surface is studied.In the weak scattering regime we have evaluated the absorption probability of absorption of a single photon. It is shown the absorption probability with diffusional contribution becomes large by a lin/l factor compared to the analogous result with the single scattering contribution. The maximum of probability takes place for the infrared wavelengths and strongly depends on the particle energy. We also discuss the case of two-dimensional periodical surface profile and indicate optimal conditions for maximal absorption probability. The results can be used in electron energy gain spectroscopy and in laser-driven acceleration.