Patterned spintronic emitter enables room-temperature, polarization/ chirality tuning during THz wave generation
https://www.eurekalert.org/news-releases/1077915
"no bulky external components (wave plates, metamaterials)... efficient, broad frequency ranges, enables compact devices... microscale stripe pattern emitter: thin-film layers of tungsten, cobalt-iron-boron, platinum, exposed to ultrafast laser pulses, generating spin current converted into an electrical charge through inverse spin Hall effect... rotating emitter switches between linear, elliptical, circular (>0.85 ellipticity across 0.74–1.66 THz range) polarization states...data transmission, imaging, sensing."
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