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- W3014149159 abstract "Abstract Picosecond strain pulses are a versatile tool for investigation of mechanical properties of meso- and nano-scale objects with high temporal and spatial resolutions. Generation of such pulses is traditionally realized via ultrafast laser excitation of a light-to-strain transducer involving thermoelastic, deformation potential, or inverse piezoelectric effects. These approaches unavoidably lead to heat dissipation and a temperature rise, which can modify delicate specimens, like biological tissues, and ultimately destroy the transducer itself limiting the amplitude of generated picosecond strain. Here we propose a non-thermal mechanism for generating picosecond strain pulses via ultrafast photo-induced first-order phase transitions (PIPTs). We perform experiments on vanadium dioxide VO 2 films, which exhibit a first-order PIPT accompanied by a lattice change. We demonstrate that during femtosecond optical excitation of VO 2 the PIPT alone contributes to ultrafast expansion of this material as large as 0.45%, which is not accompanied by heat dissipation, and, for excitation density of 8 mJ cm −2 , exceeds the contribution from thermoelastic effect by a factor of five." @default.
- W3014149159 created "2020-04-10" @default.
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- W3014149159 date "2020-04-03" @default.
- W3014149159 modified "2023-10-06" @default.
- W3014149159 title "Large non-thermal contribution to picosecond strain pulse generation using the photo-induced phase transition in VO2" @default.
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- W3014149159 doi "https://doi.org/10.1038/s41467-020-15372-z" @default.
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