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PWE elastic band structures for the 2D PC made of a square array of holes in aluminum. The gray area corresponds to the frequency range in which a unique branch of negative group velocity takes place. The dashed and dotted lines correspond to the longitudinal and transverse velocities in bulk aluminum, respectively.
(a): Photograph of the PC. (b): Top view of the experimental sample.
Time-space representation of the signal measured with the laser vibrometer on the surface along the direction. Color scale is in arbitrary units.
Amplitude in arbitrary units of the transmitted signal through the PC vs the angle of refraction for two incident transverse waves at frequencies and 450 kHz.
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