Extraordinary wave phenomena in active acoustic metamaterials

2018 ◽  
Vol 143 (3) ◽  
pp. 1917-1918
Author(s):  
Romain Fleury
Keyword(s):  
Extraordinary Wave ◽  
Acoustic Metamaterials ◽  
Active Acoustic Metamaterials ◽  
Wave Phenomena

Active acoustic metamaterials with tunable effective mass density by gradient magnetic fields

2014 ◽  
Vol 105 (7) ◽  
pp. 071913 ◽  
Author(s):  
Xing Chen ◽  
Xianchen Xu ◽  
Shigang Ai ◽  
HaoSen Chen ◽  
Yongmao Pei ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Effective Mass ◽  
Mass Density ◽  
Acoustic Metamaterials ◽  
Active Acoustic Metamaterials

scholarly journals Sharkskin-Inspired Magnetoactive Reconfigurable Acoustic Metamaterials

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Kyung Hoon Lee ◽  
Kunhao Yu ◽  
Hasan Al Ba’ba’a ◽  
An Xin ◽  
Zhangzhengrong Feng ◽  
...  
Keyword(s):  
First Generation ◽  
Logic Gates ◽  
Acoustic Metamaterials ◽  
On Demand ◽  
Mie Resonance ◽  
Frequency Regime ◽  
Physical Stimuli ◽  
Air Channels ◽  
Active Acoustic Metamaterials ◽  
Magnetoactive Elastomer

Most of the existing acoustic metamaterials rely on architected structures with fixed configurations, and thus, their properties cannot be modulated once the structures are fabricated. Emerging active acoustic metamaterials highlight a promising opportunity to on-demand switch property states; however, they typically require tethered loads, such as mechanical compression or pneumatic actuation. Using untethered physical stimuli to actively switch property states of acoustic metamaterials remains largely unexplored. Here, inspired by the sharkskin denticles, we present a class of active acoustic metamaterials whose configurations can be on-demand switched via untethered magnetic fields, thus enabling active switching of acoustic transmission, wave guiding, logic operation, and reciprocity. The key mechanism relies on magnetically deformable Mie resonator pillar (MRP) arrays that can be tuned between vertical and bent states corresponding to the acoustic forbidding and conducting, respectively. The MRPs are made of a magnetoactive elastomer and feature wavy air channels to enable an artificial Mie resonance within a designed frequency regime. The Mie resonance induces an acoustic bandgap, which is closed when pillars are selectively bent by a sufficiently large magnetic field. These magnetoactive MRPs are further harnessed to design stimuli-controlled reconfigurable acoustic switches, logic gates, and diodes. Capable of creating the first generation of untethered-stimuli-induced active acoustic metadevices, the present paradigm may find broad engineering applications, ranging from noise control and audio modulation to sonic camouflage.

Epsilon-Near-Zero Metamaterials

2021 ◽  
Author(s):  
Yue Li ◽  
Ziheng Zhou ◽  
Yijing He ◽  
Hao Li
Keyword(s):  
Quantum Physics ◽  
Extraordinary Wave ◽  
Fundamental Wave ◽  
Wave Dynamics ◽  
Microwave Engineering ◽  
Wide Range ◽  
Primary Focus ◽  
Underlying Mechanisms ◽  
Wave Phenomena ◽  
Wave Properties

This Element introduces the exotic wave phenomena arising from the extremely small optical refractive index, and sheds light on the underlying mechanisms, with a primary focus on the basic concepts and fundamental wave physics. The authors reveal the exciting applications of ENZ metamaterials, which have profound impacts over a wide range of fields of science and technology. The sections are organized as follows: in Section 2, the authors demonstrate the extraordinary wave properties in ENZ metamaterials, analyzing the unique wave dynamics and the resulting effects. Section 3 is dedicated to introducing various realization methods of the ENZ metamaterials with periodic and non-periodic styles. The applications of ENZ metamaterials are discussed in Sections 4 and 5, from the perspectives of microwave engineering, optics, and quantum physics. The authors close in Section 6 by presenting an outlook on the development of ENZ metamaterials and discussing the key challenges addressed in future works.

scholarly journals Wave propagation control in active acoustic metamaterials

2021 ◽  
Vol 2015 (1) ◽  
pp. 012031
Author(s):  
A. Bacigalupo ◽  
M. L. De Bellis ◽  
G. Gnecco ◽  
D. Misseroni
Keyword(s):  
Wave Propagation ◽  
Real Time ◽  
High Performance ◽  
Electrical Circuit ◽  
Acoustic Properties ◽  
Acoustic Metamaterials ◽  
Piezoelectric Phase ◽  
Active Acoustic Metamaterials ◽  
Opening Up

Abstract Focus is on the design of an innovative class of tunable periodic metamaterials, conceived for the realization of high performance acoustic metafilters with settable real-time capabilities. In this framework the tunability is due to the presence of a piezoelectric phase shunted by a suitable electrical circuit with adjustable impedance/admittance. It follows that the acoustic properties of the metamaterial can be properly modified in an adaptive way, opening up new possibilities for the control of pass- and stop-bands.

Recent Advances in Active Acoustic Metamaterials

2019 ◽  
Vol 11 (08) ◽  
pp. 1950081 ◽  
Author(s):  
Sanjay Kumar ◽  
Heow Pueh Lee
Keyword(s):  
Sound Wave ◽  
Dynamic Responses ◽  
Acoustic Metamaterials ◽  
Design Strategies ◽  
Acoustic Characteristics ◽  
Early 21St Century ◽  
Active Metamaterials ◽  
Potential Applications ◽  
Restricted Use ◽  
Active Acoustic Metamaterials

Since its first demonstration of an acoustic metamaterial in the early 21st century, it is widely used for sound wave manipulation purposes in many applications such as aerospace, automotive, defense, marine, etc. However, the traditional acoustic metamaterials display acoustic characteristics for restricted use because of their fixed structures. For real-world applications, the active sound wave manipulation is desirable. In recent years, active acoustic metamaterials (AAMs) have garnered attention owing to their unique design and material characteristics, which result in various dynamic responses against the incoming sound wave. This paper aims to provide an overview of the fundamental concept of active metamaterials, describing the multiple tuning mechanisms and design strategies, and highlighting their potential applications. The current fabrication challenges and future outlook in this promising field are also discussed.

scholarly journals Active acoustic metamaterials reconfigurable in real time

2015 ◽  
Vol 91 (22) ◽  
Author(s):  
Bogdan-Ioan Popa ◽  
Durvesh Shinde ◽  
Adam Konneker ◽  
Steven A. Cummer
Keyword(s):  
Real Time ◽  
Acoustic Metamaterials ◽  
Active Acoustic Metamaterials
Sign in / Sign up

Export Citation Format

Share Document