Metamaterials are a new class of man-made compound materials with exceptional properties which are not found in nature. Thanks to their superior features, they are used in a variety of fields and industries such as microwave engineering, dispersion compensation, smart antennas, sensor identification, high-frequency battlefield communications, improved ultrasonic sensors, solar energy management for high-gain antennas, remote aerospace applications, vibration control, acoustic wave guiding, and energy harvesting. The microstructures in acoustic metamaterials are locally alternating. Over the past decade, acoustic metamaterials have gained increasing attention because of the ability to modify the sound wave field or vibration at inputs in ways that cannot be achieved using ordinary materials. In the meantime, acoustic metamaterials can possess negative modulus of elasticity, negative density, or anisotropic mass. These capabilities greatly increase the choice of materials and provide an unprecedented way to manipulate/attenuate wave propagation and vibrational and acoustic behavior of structures. Physiomechanical property improvements yielded major interests in metamaterials and thereby exploring the physics of such mechanisms, leading to excellent essential investigations related to the synthesis, development, and characterization of such advanced materials.
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