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18 June 2024 Efficient spintronic Terahertz source for lightwave scanning tunnelling microscopy
Melanie Müller
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Proceedings Volume PC12994, Terahertz Photonics III; PC1299406 (2024) https://doi.org/10.1117/12.3025229
Event: SPIE Photonics Europe, 2024, Strasbourg, France
Abstract
Terahertz lightwave scanning tunneling microscopy (THz-STM) enables the imaging of ultrafast dynamics of elementary excitations on surfaces with angstrom spatial and THz-sub-cycle temporal resolution. Spintronic THz emitters (STE) are attractive sources for THz-STM because they allow the generation of ultra-broadband single-cycle THz pulses with easy polarity and polarization control by magnetic fields. However, the ultrathin metal film of the STE makes it highly sensitive to laser-induced heating, limiting the THz fields achievable with multi-watt laser systems operating at MHz repetition rates as required for THz-STM. We show that average power heating can be effectively reduced by rotating the STE at sub-kHz speed. The rotating STE can be operated at optimal excitation fluences of ~0.1-1 mJ/cm2 using laser pulses of a few tens of µJ energy and up to 18 W power at MHz repetition rates collimated in a pump spot of a few mm diameter, resulting in power densities that would normally cause immediate thermal damage to the STE. Finally, we highlight the ability of the STE-driven THz-STM to drive plasmonic STM-luminescence and to probe ultrafast electron and phonon dynamics in 1T-TaS2.
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Melanie Müller "Efficient spintronic Terahertz source for lightwave scanning tunnelling microscopy", Proc. SPIE PC12994, Terahertz Photonics III, PC1299406 (18 June 2024); https://doi.org/10.1117/12.3025229
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KEYWORDS
Terahertz radiation
Scanning tunneling microscopy
Solar thermal energy
Spintronics
Quantum photonics
Terahertz sources
Antennas
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