Features of propagation of surface acoustic waves in two-dimensional phononic crystals on the surface of a lithium niobate crystal |
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Authors: | S A Nikitov A V Grigor’evskii V I Grigor’evskii I M Kotelyanskii V A Luzanov E N Mirgorodskaya S G Suchkov |
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Abstract: | Two-dimensional phononic crystals are fabricated on the surface of a lithium niobate crystal. A numerical method is developed
for calculating the frequency dependences of the transmission and reflection coefficients of a surface acoustic wave for a
rectangular region with two-dimensional periodic structure on the surface of an elastic body. Measurements of the frequency
dependences of the reflection and transmission coefficients are performed for propagation in the part of the lithium niobate
crystal surface on which two-dimensional phononic crystals were fabricated. Forbidden zones are found in the transmission
spectra of the waves transmitted through phononic crystals. It is shown that, if the width of the incident wave beam is less
than the width of the region with the two-dimensional periodic structure (the two-dimensional phononic crystal), then a resonant
increase in the transmission coefficient arises near the center of the rejection band. |
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