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 superlattice structures. These structures are fabricated with a Distributed Bragg Reflector (DBR) aimed at achieving a high quantum efficiency (QE)~ 20\% in addition to a high electron spin polarization (ESP) ~85\% at the desired wavelength of 780 nm. We present the QE and ESP measurements of photoemitted electrons as a function of wavelength of incident light, along with morphological and photoluminescence 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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