Rotating spintronic terahertz emitter optimized for microjoule pump-pulse energies and megahertz repetition rates

• DOI: 10.1063/5.0214469
• Publication Date: 2024-08-13T15:07:42Z
• Authors: Alkisti Vaitsi; Vivien Sleziona; Luis E. Parra López; Yannic Behovits; Fabian Schulz; Natalia Martín Sa...; Tobias Kampfrath; Martin Wolf; Tom S. Seifert; Melanie Müller
• Keywords: Optical rectification

Spintronic terahertz emitters (STEs) are powerful sources of ultra-broadband single-cycle (THz) field transients. They work with any pump wavelength, and their polarity polarization direction easily adjustable. However, at high powers repetition rates, STE operation is hampered by a significant increase in the local temperature. Here, we resolve this issue rotating few 100 Hz, thereby distributing absorbed power over larger area. Our approach permits stable fluence ∼1 mJ/cm2 up to 18 W megahertz corresponding pump-pulse energies 10 μJ densities approaching 1 kW/cm2. The interest for all high-power applications requiring rates. As an example, show that pulses peak fields kV/cm can be coupled terahertz-light wave-driven scanning tunneling microscope MHz rate, demonstrating compete standard such as LiNbO3.