Monte Carlo simulations of electron photoemission from plasmon-enhanced bialkali photocathode

Overview of the Semiconductor Photocathode Research in China

“…Therefore, this can be suppressed and new possibilities for tailoring the nature of materials with improved performance can be achieved from the simulation results. The simulated results show that the QE of a K2CsSb photocathode with SPPs is 2-3 times that of the photocathode without SPPs [73]. Furthermore, the intrinsic emittance of the photocathode remains substantially constant, which means it is possible to obtain a photocathode with high QE and low emittance at the same time.…”

“…To enhance the electron emission, the surface polarized plasmons (SPPs) are also investigated at SARI [72][73][74][75][76]. The silver substrate with a nanopattern is employed to achieve wave vector matching and the SPPs is excited between the substrate and photocathode [73]. The nanopattern on the silver substrate (the width, depth, and the thickness of the photocathode) is optimized by CST studio to achieve the needed SPPs excited by specific wavelength.…”

“…Hence the increased absorption and the designed PNF can help to improve the photocathode's performance, such the QE and intrinsic emittance. To enhance the electron emission, the surface polarized plasmons (SPPs) are also investigated at SARI [72][73][74][75][76]. The silver substrate with a nanopattern is employed to achieve wave vector matching and the SPPs is excited between the substrate and photocathode [73].…”

“…This is very helpful to understand the mechanism of the intrinsic emittance, which in turn can help to derive a high brightness electron beam by adjusting the initial distribution of the photoelectron along the depth direction. To enhance the electron emission, the surface polarized plasmons (SPPs) are also investigated at SARI [72][73][74][75][76]. The silver substrate with a nanopattern is employed to achieve wave vector matching and the SPPs is excited between the substrate and photocathode [73].…”

Review of photocathodes for electron beam sources in particle accelerators

“…These two important and widely used models of the photoemission process can be further extended with the help of simulation methods such as Monte-Carlo, 54–57 density functional theory (DFT) 58–62 and machine learning. 63–68 DFT, for example, is used to calculate energy states based on electron densities and their energies.…”