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Search Results: Impulsive stimulated thermal scattering (ISTS)

Impulsive stimulated thermal scattering, also known as transient grating photoacoustics, is a purely optical, noncontacting method capable of...


= Encyclopedia Article; = Research Update
Figure 1.ISTS experiment. (a) Crossed laser pulses induce coherent, monochromatic acoustic and thermal motions in a thin film. (b) Continuous-wave probing laser diffracts from the ripple on the surface of the sample. Measuring the intensity of the diffracted light with a fast detector and transient recorder reveals the time dependence of the motions.
Figure 2.ISTS data collected at an acoustic wavelengh of 7 µm from a copper film (thickness 1.8 µm) on a layer of silicon dioxide (thickness 0.1 µm) on a silicon substrate. The oscillations in the signal reveal the frequencies of two acoustic waveguide modes (?1 and ?2) that are excited and monitored in this measurement. The inset shows the power spectrum.
Figure 3.Acoustic waveguide modes and their dispersion. (a) Computed displacement distributions for the lowest two modes in a polymer film supported by a silicon substrate. (b) Dispersion of similar modes in a waveguide formed by a layer of copper (thickness 100, 500, and 1500 nm) on a silicon substrate. The dependence of the velocities on thickness provides the basic for the ISTS thickness measurement. 1 km/s = 0.62 mi/s.
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