Christabel Choi

Dec 3, 2024 | onlinelibrary.wiley.com | Christabel Choi |James Hardwick |Shubhi Bansal |

Graphical Abstract Acoustic Metamaterials In article number 2404093, Christabel Choi, Sriram Subramanian, and co-workers achieve continuous out-of-plane actuation >5 mm of objects using fluid-driven membrane-based actuation. Fluidic chip prototypes consisting of multi-layered channels are fully 3D-printed, with an elastomeric membrane attached to the surface, which is interfaced with acoustic metamaterial reflectors.

Aug 30, 2024 | onlinelibrary.wiley.com | Christabel Choi |James Hardwick |Shubhi Bansal |

1 Introduction Acoustic metamaterials (AMMs) have been investigated for their extraordinary sound manipulation capabilities, to enable applications such as sound attenuation,[1, 2] sound focusing,[3-5] energy harvesting,[6] holography,[7] and acoustic levitation.[8-10] In particular, tunable, and reconfigurable AMMs[11-13] have been sought after for their operational flexibility and multifunctionality, e.g., focusing a beam, and steering it on-demand. Prat-Camps et.

Jan 22, 2024 | onlinelibrary.wiley.com | Shubhi Bansal |Christabel Choi |

In recent years, planar aperture-based acoustic devices have been investigated due to their thin form factor, high effective transmission, and sound modulation capability. Moreover, reconfigurable, and tunable devices are being continuously researched to enable multiple degrees of freedom in real-time. Here, we present an aperture-based acoustic device that enables tunable multilateral ultrasonic operation.

Jan 4, 2024 | nature.com | Shubhi Bansal |Manish Tiwari |Christabel Choi

AbstractCurrently, space-coiling acoustic metamaterials are static, requiring manual reconfiguration for sound-field modulation. Here, we introduce an approach to enable active reconfiguration, using standalone dynamic space-coiling unit cells called dynamic meta-bricks. Unlike their static counterparts, these meta-bricks, house an actuatable soft robotic-inspired magnetorheological elastomeric flap. This flap operates like a switch to directly control the transmitted ultrasound.