Attosecond transient grating spectroscopy with near-infrared grating pulses and an extreme ultraviolet diffracted probe

• DOI: 10.48550/arxiv.2407.19609
• Publication Date: 2024-07-28
• Authors: Rafael Quintero‐B...; Lorenz Drescher; Vincent Eggers; Kevin Gulu Xiong; Stephen R. Leone
• Keywords: Attosecond; Extreme ultraviolet; Ultraviolet; Transient (computer programming)

Transient grating spectroscopy has become a mainstay among metal and semiconductor characterization techniques. Here we extend the technique towards shortest achievable timescales by using tabletop high-harmonic generation of attosecond extreme ultraviolet (XUV) pulses that diffract from transient gratings generated with 500-1000 nm sub-5 fs near-infrared (NIR) pulses. We demonstrate power (ATGS) investigating ultrafast photoexcited dynamics in an Sb semimetal thin film. ATGS provides element-specific, background-free signal, unfettered spectral congestion, contrast to absorption spectroscopy. With measurements polycrystalline films, observe coherent phonons investigate lattice carrier dynamics. Among latter processes, extract thermalization, hot cooling, electron-hole recombination, which are on order 20 fs, 50 2 ps, timescales, respectively. Furthermore, simultaneous collection data allows us total complex dielectric constant sample dynamics, including real-valued refractive index, also able carrier-phonon interactions longer-lived phonon The outlined experimental expands capabilities spectroscopies providing wealth information concerning element-selective technique, at timescales.