Effect of plasmonic near field on the emittance of plasmon-enhanced photocathode

TL;DR

This paper analyzes how plasmonic near fields influence the emittance of plasmon-enhanced photocathodes, demonstrating that they can increase emittance and discussing suppression methods to optimize photocathode performance.

Contribution

It introduces a simulation approach to estimate plasmonic near field effects on emittance and discusses suppression techniques for improved photocathode design.

Findings

Plasmonic near fields can significantly increase photocathode emittance.

Simulation methods effectively estimate emittance caused by plasmonic effects.

Suppression strategies can mitigate emittance increase.

Abstract

The introduction of the surface plasmon polarizations makes the emittance of the photocathode complicated. In this paper, the emittance of plasmon-enhanced photocathode is analyzed. It is first demonstrated that the plasmonic near field can increase the emittance of the plasmon-enhanced photocathode. A simulation method has been used to estimate the emittance caused by plasmonic near field, and the suppression method also has been discussed, both of which are significant for the design of high performance plasmon-enhanced photocathode.