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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
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.
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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