Tantalum Selenide Micro-Wafer Terahertz Emitter

Terahertz waves possess distinct characteristics, including such as transience, coherence, low energy, penetration, and fingerprint spectroscopy, which render them well-suited for a diverse range of applications in security inspection, nondestructive testing, and environmental detection. However, the efficiency of terahertz wave generation remains constrained by the terahertz source. To address this limitation and minimize losses in the generation process, the selection of band-gap-free semi-metallic materials, as terahertz radiation sources, is of utmost importance. We successfully fabricate TaSe2 micro-wafer measuring 1×0.5 μm. By employing optical pumping at a wavelength of 1040 nm and a pulse duration of 150 fs, we achieve a terahertz output of nearly 0.005 μW. This output surpasses the terahertz generation efficiency of GaP crystals by approximately 20