Subcycle surface electron emission driven by strong-field terahertz waveforms

Li, Shaoxian and Sharma, Ashutosh and Márton, Zsuzsanna and Nugraha, Priyo S. and Lombosi, Csaba and Ollmann, Zoltán and Márton, István and Dombi, Péter and Hebling, János and Fülöp, József A. (2023) Subcycle surface electron emission driven by strong-field terahertz waveforms. NATURE COMMUNICATIONS, 14. No-6596. ISSN 2041-1723

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Abstract

The advent of intense terahertz (THz) sources opened a new era when the demonstration of the acceleration and manipulation of free electrons by THz pulses became within reach. THz-field-driven electron emission was predicted to be confined to a single burst due to the single-cycle waveform. Here we demonstrate the confinement of single-cycle THz-waveform-driven electron emission to one of the two half cycles from a solid surface emitter. Either the leading or the trailing half cycle was active, controlled by reversing the field polarity. THz-driven single-burst surface electron emission sources, which do not rely on field-enhancement structures, will impact the development of THzpowered electron acceleration and manipulation devices, all-THz compact electron sources, THz waveguides and telecommunication, THz-field-based measurement techniques and solid-state devices.

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