Archives of Acoustics, 31, 4(S), pp. 131-135, 2006

The Fourier analysis of picosecond acoustic signals generated by laser beam in Au/V nanolayers

M. Aleksiejuk
Institute of Fundamental Technological Research, Polish Academy of Sciences, Świętokrzyska 21, 00-049 Warszawa
Poland

Feliks Rejmund
Institute of Fundamental Technological Research, Polish Academy of Sciences, Świętokrzyska 21, 00-049 Warszawa
Poland

Paper presents the results of study of picosecond acoustic signals generated by femtosecond
laser pump pulse in Au/V multilayers. Au/V nanostructures with a period of 36-205Å
located on MgO substrate were studied. The dependence of measured changes of the laser
light reflectivity from nanostructure surface on different delays of probe beam was examined.
Peak frequencies obtained by FFT analysis were interpreted as frequencies of acoustical localized
modes. The obtained values of these localized modes are in agreement with numerical
results. In the same sample localized modes were excited simultaneously in the first and second
frequency forbidden gaps.
Keywords: picosecond acoustics, metallic nanolayers, FFT analysis.
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