Double Negativity in 3D Space Coiling Metamaterials.

Area of Science:

• Acoustic Metamaterials
• Wave Manipulation
• Materials Science

Background:

• Metamaterials with negative refractive indices enable advanced wave manipulation for applications like cloaking and superlensing.
• The space-coiling technique is a novel approach to achieve extreme material properties.
• Space-coiling exhibits lower energy absorption compared to local resonance methods for achieving extreme parameters.

Purpose of the Study:

• To investigate and demonstrate extreme properties in 3D space-coiling acoustic metamaterials.
• To analyze the frequency-dispersive spectrum of constitutive parameters in these metamaterials.
• To validate the theoretical findings with acoustic band dispersion calculations.

Main Methods:

• Design and simulation of 2D maze and 3D space-coiling labyrinthine structures.
• Calculation of the frequency-dispersive spectrum of extreme constitutive parameters.
• Analysis of acoustic band dispersion for validation.

Main Results:

• Demonstration of extreme properties in doubly negative 3D space-coiling acoustic metamaterials.
• Calculation of the frequency-dispersive spectrum of extreme constitutive parameters for 2D and 3D structures.
• Good agreement between calculated parameters and acoustic band dispersion.

Conclusions:

• 3D space-coiling acoustic metamaterials can achieve extreme properties with reduced energy absorption.
• The space-coiling approach is effective for designing advanced acoustic metamaterials.
• This research opens possibilities for novel applications in wave manipulation.