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(a) Schematic of the unit cell of the square-lattice PC plate with periodic membranes. (b) Picture of the specimen. (c) Full section view of the unit cell.
Reference spectrum measured on the membrane surface from the laser source along the direction (solid line) and the spectrum measured on the uniform steel plate of thickness (dashed line).
Band structures of the PC plate with (dots) and without (solid curves) the membrane layer.
Mode shapes of the resonant slow modes in the complete PBG (modes F). (a) The lower mode (red band). (b) The higher mode (blue band).
Wavelet coefficients in the frequency-time domain of the measured signal along the direction with traveling distances equal to , , , and .
Calculated group velocities of the second order dipole modes as a function of frequency.
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