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Nanoscale photothermal and photoacoustic transients probedwith extreme ultraviolet radiation
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup for optical pumping and EUV probing of thermal and acoustic transients. Part of the laser output is upconverted to generate the EUV probe beam. Optical excitation of the sample induces thermal displacement and acoustic oscillations, which are subsequently detected by measuring the time-delayed, diffracted EUV probe. The sample is shown in detail.

Image of FIG. 2.
FIG. 2.

Integrated first-order diffraction signal following optical excitation of a sample consisting of and stripes. Clear acoustic oscillations are evident with a frequency of and a decay time of . Inset shows single frequency fit to the data displaying the frequency.

Image of FIG. 3.
FIG. 3.

Measured change in EUV diffraction efficiency as a function of pump fluence (lower axis). Changes in diffraction exhibit linear behavior throughout the entire region of pumping fluence. The dashed line shows the calculated change in diffraction efficiency as a function of maximal thermal displacement (top axis). The two lines overlap almost exactly.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanoscale photothermal and photoacoustic transients probedwith extreme ultraviolet radiation