瞬态功函数门控:一种新的光电发射机制

S. Carbajo
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引用次数: 2

摘要

我们提出了一种新的光发射机制的理论基础,即瞬态功函数门控(TWFG),它在时间和能量上对光发射进行门控,并产生具有热受限发射度、百分比级量子效率和时间相干性控制的近阈值光电子。该技术包括利用非电离长波光场对广义光电阴极的功函数进行主动门控,从而在其表面产生载流子密度的绝热调制。我们研究TWFG作为一种手段来规避长期存在的低发射度和高量子效率之间的权衡,不受粒子源或光电阴极特性的限制。TWFG为下一代基于电子和加速器的x射线光子源的光电物理提供了新的机会。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transient work function gating: A new photoemission regime
We present the theoretical basis for a new photoemission regime, transient work function gating (TWFG), that temporally and energetically gates photoemission and produces near-threshold photoelectrons with thermally limited emittance, percent-level quantum efficiency, and control over temporal coherence. The technique consists of actively gating the work function of a generalized photocathode using non-ionizing long-wavelength optical field to produce an adiabatic modulation of the carrier density at their surface. We examine TWFG as a means to circumvent the long-standing trade-off between low emittance and high quantum efficiency, untethered to particle source or photocathode specifics. TWFG promises new opportunities in photoemission physics for next generation electron and accelerator-based x-ray photon sources.
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