A5017552342- Acoustic Wave Phenomena Research
- Metamaterials and Metasurfaces Applications
- Aerodynamics and Acoustics in Jet Flows
- Speech and Audio Processing
- Noise Effects and Management
- Topological Materials and Phenomena
- Underwater Acoustics Research
- Orbital Angular Momentum in Optics
- Microfluidic and Bio-sensing Technologies
- Quantum, superfluid, helium dynamics
Collaborative Innovation Center of Advanced Microstructures
2019-2024
Nanjing University
2019-2024
Abstract Transceiving ultra-weak sound typically relies on signal pre-amplification at the transmitting end via active electro-acoustic devices, which inherently perturbs environment in form of noise that inevitably leads to information leakage. Here we demonstrate a passive remote-whispering metamaterial (RWM) enabling weak airborne audible frequencies reach unprecedented enhancement without altering detected ambient soundscape, is based extraordinary scattering properties formed by pair...
Over the recent decade, topological insulators, originating from condensed matter physics, have resided at frontier in field of acoustics owing to their novel properties for manipulating robust wave propagation, which also opened an intriguing landscape potential applications. At meantime, gradually slowing down acoustic waves with metamaterials allows temporary storage sound, leading exploration so-called trapped rainbow. However, most current studies are reported a trivial context complex...
Abstract Recent years have witnessed a rapidly growing interest in exploring the use of spiral sound carrying artificial orbital angular momentum (OAM), toward establishing spiral-wave-based technology that is significantly more efficient energy or information delivering than ordinary plane wave technology. A major bottleneck advancing this excitation far-field waves free space, which must for long-distance transmission and particle manipulation. Here, we report low-profile planar acoustic...
Detection of weak sound signals masked by strong noise background remains challenging in acoustic science and engineering. The major bottleneck advancing this technology is the limited directivity sensitivity ordinary sensors. Here, we engineer metamaterials with a near-zero-index (NZI) form low-profile planarized antenna for combined highly directive-sensitive detection. detectable incident angle can be substantially narrowed down directional selectivity NZI metamaterials, while detected...
A high-performance acoustic vortex beam generator (VBG) based on artificial micro-structured metamaterials is of great significance in communication. However, to date, the research metamaterial VBGs mainly focused their single frequency properties narrow band. Here, we propose a design strategy broadband constructed by gradient coupled-resonant meta-atoms, all which show near-unity transmission amplitudes, while covering 2π phase shifts linearly varied along with throughout desired...
On the quest towards efficiently eliminating noises, development of a subwavelength sound absorber with capability free ventilation remains challenging. Here, we theoretically propose and experimentally demonstrate an asymmetric metamaterial constructed by tuned Mie resonators (MRs) unbalanced intrinsic losses. The lossy MR layer is highly dissipative to consume energy while lossless one acts as acoustically soft boundary. Thus, presents quasi-perfect absorption (95% in experiment) for waves...
Acoustic metasurfaces have paved the way for ongoing development of compact sound-absorbing devices that possess excellent ventilation capabilities. However, existing absorption mechanisms primarily focus on plane-wave fronts while neglecting omnidirectionally radiated cylindrical waves. In this study, drawing inspiration from wave-interference theory, we propose an approach to absorb sound waves by combining artificially decorated passive monopoles and dipoles, which are synthesized a...
Acoustic vortices (AVs) based on artificial metamaterials have attracted intense research efforts for their potential use in subdiffraction imaging, particle manipulation, and acoustic communication. However, to date, major strategies generate AVs an intrinsic limitation of fundamentally depending complex phase modulations, which require a higher number multiple elements as the desired topological charge increases, let alone elaborate dephasing between individual microstructured switching...