Recently, asymmetric plasmonic nanojunctions have shown promise as on‐chip electronic
devices to convert femtosecond optical pulses to current bursts, with a bandwidth of multi‐
terahertz scale, although yet at low temperatures and pressures. Such nanoscale devices
are of great interest for novel ultrafast electronics and opto‐electronic applications. Here, the
device is operated in air and at room temperature, revealing the mechanisms of
photoemission from plasmonic nanojunctions, and the fundamental limitations on the speed …