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Physical Review Letters
Volumn 69, Issue 11, 1992, Pages 1668-1671
Coherent phonon detection from ultrafast surface vibrations
Author keywords

[No Author keywords available]
Indexed keywords

EID: 0001698496     PISSN: 00319007     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevLett.69.1668     Document Type: Article
Times cited : (172)
References (26)
  • 9
    • 84975541778 scopus 로고
    • Observation of the transient expansion of heated surfaces by picosecond photothermal deflection spectroscopy
    • (1988) Optics Letters , vol.13 , pp. 713
    • Rothenberg, J.E.1
  • 18
    • 0001292732 scopus 로고
    • The effect of thermal diffusion depends on the parameter D / v ζ approx 0.05 for our Mo film, with the thermal diffusivity D calculated from the data of Fig. 1(c) using the method of, ignoring electron diffusion. This changes the strain pulse asymmetrically, slightly broadening only the trailing side (see Ref. [2]). We assume the a-Si film does not affect the substrate echo in Fig. 3(e).
    • (1986) J. Appl. Phys. , vol.60 , pp. 285
    • Paddock, C.A.1    Eesley, G.L.2
  • 20
    • 84927390140 scopus 로고    scopus 로고
    • This further distorts the phonon pulse shapes.
  • 21
    • 84927390138 scopus 로고    scopus 로고
    • An enhancement of order 10 is predicted by using a simple model for the maximum angular deflection, δ θmax approx η0ζ / w, w the spot size, and the associated relative intensity change, (I1- I2) / I1approx w δ θ / lambda; the expression for δ R / R is taken from Ref. [2].
  • 22
    • 84927390136 scopus 로고    scopus 로고
    • We find d n / d η = d κ / d η approx - 0.5, taking account of the Gaussian profile of the pump and probe beams and the pulse duration. An independent estimate is possible using the method of Ref. [8] and, for the case of Cr for which results are available, consistent values (| d n / d η | < 1 and | d κ / d η | < 1) are obtained.

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