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Given the quasi-static nature of optical-field emission and the nontrivialdependence of the emission rate on the instantaneous electric field strength,the CEP-sensitive component of the emitted photocurrent is highly sensitive tothe energy of the optical pulse, and should carry information about theunderlying sub-cycle dynamics of electron emission. Here we examineCEP-sensitive photoemission from plasmonic gold nanoantennas excited withfew-cycle optical pulses of increasing energy. We observe antiresonance-likefeatures in the CEP-sensitive photocurrent; specifically, at a critical pulseenergy, we observe a sharp dip in the magnitude of the CEP-sensitivephotocurrent accompanied by a sudden shift of {\pi}-radians in the phase of thephotocurrent. Using a quasi-static tunneling emission model, we find that theseantiresonance-like features arise due to competition between electron emissionfrom neighboring optical half-cycles, and that they are highly sensitive to theprecise shape of the driving optical waveform at the surface of the emitter. Asthe underlying mechanisms that produce the antiresonance-like features are ageneral consequence of nonlinear, field-driven photoemission, theantiresonance-like features could be used to probe sub-optical-cycle,sub-femtosecond emission processes, not only from solid-state emitters, butalso from gas-phase atoms and molecules. Beyond applications in the study ofultrafast, field-driven electron physics, an understanding of theseantiresonance-like features will be critical to the development of novelphotocathodes for future time-domain metrology and microscopy applications thatdemand both attosecond temporal and nanometer spatial resolution.

Antiresonance-Like Behavior in Carrier-Envelope-Phase-Sensitive Optical-Field Photoemission from Plasmonic Nanoantennas