瞬时Work Function门控：一种新的光发射机制
Transient Work Function Gating: A New Photoemission Regime
摘要：
我们提出了一个新的光电发射制度，瞬态功函数门控（TWFG），时间和能量门控光电发射，并产生近阈值光电子与热限制发射度，量子效率，和控制时间的相干性的理论基础。该技术包括使用非电离长波长光场主动门控广义光阴极的功函数，以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，以规避长期存在的低发射度和高量子效率之间的权衡，不受粒子源或光阴极的具体情况。TWFG为下一代电子和基于加速器的X射线光子源提供了光电发射物理学的新机会。
英文摘要：
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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