Highly Effective Polarized Electron Sources Based on Strained Semiconductor Superlattice with Distributed Bragg Reflector

Gerchikov, L. G.; Aulenbacher, K.; Clendenin, J. E.; Kuzmichev, V. V.; Mamaev, Yu. A.; Maruyama, Takashi; Mikhrin, V. S.; Roberts, J.S.; Ustinov, V. M.; Vasiliev, D. A.; Vasiliev, A. P.; Yashin, Yu. P.; Zhukov, A. E.

doi:10.1063/1.2888077

Cited by 4 publications

(1 citation statement)

References 8 publications

(10 reference statements)

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“…A photocathode with a distributed Bragg reflector (DBR) was first proposed in 1993 24 and reported in the following years, 25,26 as a means to enhance the photocathode QE. The DBR serves to create a Fabry-Perot cavity formed by the front surface of photocathode and the DBR region.…”

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confidence: 99%

Record-level quantum efficiency from a high polarization strained GaAs/GaAsP superlattice photocathode with distributed Bragg reflector

Wei

Chen

et al. 2016

Applied Physics Letters

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Photocathodes that provide high electron-spin polarization (ESP) and high quantum efficiency (QE) can significantly enhance the physics capabilities of electron accelerators. We report recordlevel QE from a high-polarization strained GaAs/GaAsP superlattice photocathode fabricated with a Distributed Bragg Reflector (DBR). The DBR photocathode technique enhances the absorption of incident laser light thereby enhancing QE, but as literature suggests, it is very challenging to optimize all of the parameters associated with the fabrication of complicated photocathode structures composed of many distinct layers. Past reports of DBR photocathodes describe high polarization but typically QE of only $1%, which is comparable to QE of high polarization photocathodes grown without a DBR structure. This work describes a strained GaAs/GaAsP superlattice DBR photocathode exhibiting a high polarization of 84% and significantly enhanced QE of 6.4%.

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confidence: 99%

Record-level quantum efficiency from a high polarization strained GaAs/GaAsP superlattice photocathode with distributed Bragg reflector

Wei

Chen

et al. 2016

Applied Physics Letters

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Photocathodes

Wei

Poelker

Smedley

et al. 2020

Modern Developments in Vacuum Electron Sources

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Photocathodes were at the heart of quantum physics development in the early twentieth century and are still used in high technologies devices like night-vision goggles, photomultiplier tubes and particle accelerators. The simplest form of photocathode is a metallic surface, negatively biased, from which electrons are extracted by energetic photons. After a brief description of the photocathode preparation, this chapter will present the latest developments and limitations of metallic and semiconductor photocathodes.

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An overview of how parity-violating electron scattering experiments are performed at CEBAF

Adderley

Bullard

Chao

et al. 2023

Nuclear Instruments and Methods in Physics Research Section A:

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Highly Effective Polarized Electron Sources Based on Strained Semiconductor Superlattice with Distributed Bragg Reflector

Cited by 4 publications

References 8 publications

Record-level quantum efficiency from a high polarization strained GaAs/GaAsP superlattice photocathode with distributed Bragg reflector

Record-level quantum efficiency from a high polarization strained GaAs/GaAsP superlattice photocathode with distributed Bragg reflector

Photocathodes

An overview of how parity-violating electron scattering experiments are performed at CEBAF

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