On-Chip Metamaterials: Physics, Engineering, and Applications

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E:Engineering and Technology".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 3184

Special Issue Editor


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Guest Editor
George W. Woodruff School of Mechanical Engineering, Georgia Tech, Atlanta, GA 30332, USA
Interests: metamaterials; wave propagation; physical acoustics; biomedical acoustics; ultrasound imaging and therapy; acoustofluidics
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Special Issue Information

Dear colleagues,

Metamaterials are artificial materials designed to realize properties unprecedented in the nature, such as negative refractive index, hyperbolic dispersions, and topological protections. These novel material properties enabled many important applications, including invisibility cloaks, super-resolution imaging, and nonreciprocal wave transports. Metamaterials were first developed based on electromagnetic resonating elements for the modulation of optical properties in order to achieve a negative permittivity and permeability for the manipulation of light. The concept was applied to acoustic resonators to develop metamaterials with a negative density and bulk modulus to modulate airborne sound. Since then, different types of metamaterials have been developed to realize a broad scope of functionalities. The recent advances in topological physics induce a new type of metamaterials with topologically protected properties and robust one-way wave transport. In optics, metamaterials made from metal and dielectric materials have been fabricated on chips, known as metasurfaces, to achieve super-thin optical lens, skin cloaking, and special optical mode emissions. More recently, acoustic metamaterials have been adapted onto microfluidic devices on-chip to manipulate surface acoustic waves that drive the motions of micro-particles and cells in acoustofluidics. These on-chip metamaterials can potentially be applied to control the photon and phonon propagations, and electron motions as well. In this Special Issue, we will cover the recent progresses in on-chip metamaterials including the physics, engineering, and their applications.

Dr. Chengzhi Shi
Guest Editor

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Keywords

  • Metamaterials
  • On-chip devices
  • Wave physics
  • Optics
  • Acoustics

Published Papers (1 paper)

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11 pages, 23168 KiB  
Article
Low-Frequency, Open, Sound-Insulation Barrier by Two Oppositely Oriented Helmholtz Resonators
by Yi-Jun Guan, Yong Ge, Hong-Xiang Sun, Shou-Qi Yuan and Xiao-Jun Liu
Micromachines 2021, 12(12), 1544; https://doi.org/10.3390/mi12121544 - 11 Dec 2021
Cited by 13 | Viewed by 2633
Abstract
In this work, a low-frequency, open, sound-insulation barrier, composed of a single layer of periodic subwavelength units (with a thickness of λ/28), is demonstrated both numerically and experimentally. Each unit was constructed using two identical, oppositely oriented Helmholtz resonators, which were composed of [...] Read more.
In this work, a low-frequency, open, sound-insulation barrier, composed of a single layer of periodic subwavelength units (with a thickness of λ/28), is demonstrated both numerically and experimentally. Each unit was constructed using two identical, oppositely oriented Helmholtz resonators, which were composed of a central square cavity surrounded by a coiled channel. In the design of the open barrier, the distance between two adjacent units was twice the width of the unit, showing high-performance ventilation, and low-frequency sound insulation. A minimum transmittance of 0.06 could be observed around 121.5 Hz, which arose from both sound reflections and absorptions, created by the coupling of symmetric and asymmetric eigenmodes of the unit, and the absorbed sound energy propagating into the central cavity was greatly reduced by the viscous loss in the channel. Additionally, by introducing a multilayer open barrier, a broadband sound insulation was obtained, and the fractional bandwidth could reach approximately 0.19 with four layers. Finally, the application of the multilayer open barrier in designing a ventilated room was further discussed, and the results presented an omnidirectional, broadband, sound-insulation effect. The proposed open, sound-insulation barrier with the advantages of ultrathin thickness; omnidirectional, low-frequency sound insulation; broad bandwidth; and high-performance ventilation has great potential in architectural acoustics and noise control. Full article
(This article belongs to the Special Issue On-Chip Metamaterials: Physics, Engineering, and Applications)
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