PART 1 : Observation and characterisation of forbidden bands in a PC. Experimental Band structure determination

• 1D Phononic Crystal made of a stack of rectangular plates. Particular case of piezoelectric plates

•2D square array of steel cylinders embedded in an epoxy matrix.

PART 2 : Experimental demonstration of the negative refraction in a solid PC. Waves with opposite group and phase velocities

• Negative refraction in a solid phononic crystal
• Lamb waves in a plate with periodic corrugation