Speaker
Description
Spin polarized electron sources find application in both high energy and nuclear physics experiments. We describe in detail the design and characterization of different photocathodes based on GaAs/GaAsP and GaAs/AlGaAsP superlattice structures. These structures are equipped with a Distributed Bragg Reflector (DBR) aimed at achieving a high electron spin polarization (ESP) ~ 85% and quantum efficiency (QE) ~20% simultaneously at the desired wavelength of 780nm. We present the QE and ESP measurements of photoemitted electrons as a function of wavelength of incident light, along with morphological and photoluminescence band gap energy measurements.
Funding Agency
The work is supported by Brookhaven Science Associates, LLC under Contract DE-SC0012704 with the U.S. DOE. Sandia National Laboratories under contract DE-NA0003525.
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