Principle of the Emitter (IMAGE)
Caption
The principle of the emitter: An extremely short laser pulse drives electrons out of a magnetic metal layer into a non-magnetic one. The important point is that there are two types of electrons which differ in spin (thick light blue arrows) and in number (length of the thick arrow). In the non-magnet, these electrons are deflected up or down, depending on the direction of their spin. The resulting short pulse of current along the red arrow generates a terahertz pulse.
Credit
FHI/Nature Photonics 2016
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