Acoustic properties of globular photonic crystals based on synthetic opals |
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| Authors: | N F Bunkin V S Gorelik and V V Filatov |
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| Institution: | 1.Wave Research Center, Prokhorov General Physics Institute,Russian Academy of Sciences,Moscow,Russia;2.Lebedev Physical Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Acoustic properties of globular photonic crystals based on synthetic opals and composed of closely packed SiO2 globules about 200 nm in diameter are theoretically investigated. Dispersion characteristics of the investigated samples
are numerically simulated, and the group velocity of acoustic waves and the effective mass of acoustic phonons are found.
It is shown that phononic bandgaps in these photonic crystals are within the gigahertz frequency range. The effective mass
of the acoustic phonons corresponding to the edges of the bandgaps is found, and a possibility that bound states of acoustic
phonon pairs, biphonons, manifest themselves in the light scattering spectra is discussed. |
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