Engineered diffraction gratings for acoustic cloaking

Abstract

We show that engineered diffraction gratings can considerably simplify the design and performance of acoustic devices. Acoustic reflecting gratings based on rectangular cavities drilled on an acoustically rigid surface are designed in such a way that all the incident energy is channeled towards the diffracted mode traveling in the oposite direction of the incident field (retroreflection effect), and this effect is used to cloak an object placed over a rigid surface. Axisymmetric gratings consisting in rigid surfaces with just one groove per unit cell are used to design acoustic thin acoustic carpet cloaks. Finally, full wave numerical simulations are performed and a conical carpet cloak is experimentally tested, showing an excellent scattering cancellation effect.

References in corpus (6)

• Hiding Under the Carpet: a New Strategy for Cloaking
• Wavefront Modulation and Subwavelength Diffractive Acoustics with an Acoustic Metasurface
• Experimental demonstration of three-dimensional broadband underwater acoustic carpet cloak
• Acoustic Anomalous Reflectors Based on Diffraction Grating Engineering
• The Inverse Grating Problem: Efficient Design of Anomalous Flexural Wave Reflectors and Refractors
• Hyperelastic antiplane ground cloaking

Cited by in corpus (5)

• Gradient index phononic crystals and metamaterials
• Controllably asymmetric beam splitting via gap-induced diffraction channel transition in dual-layer binary metagratings
• Experimental demonstration of asymmetric diffraction based on a passive parity-time-symmetric acoustic grating
• Metaclusters for the Full Control of Mechanical Waves
• Real-time-controlled artificial quiet channel for acoustic cloaking under varying detection conditions