scholarly journals Visco-thermal effects in acoustic metamaterials: from total transmission to total reflection and high absorption

2016 ◽  
Vol 18 (3) ◽  
pp. 033003 ◽  
Author(s):  
Miguel Molerón ◽  
Marc Serra-Garcia ◽  
Chiara Daraio
Keyword(s):  
Thermal Effects ◽  
Total Reflection ◽  
Acoustic Metamaterials ◽  
Total Transmission ◽  
High Absorption

Total Reflection and Cloaking by Triangular Defects Embedded in Zero Index Metamaterials

2015 ◽  
Vol 7 (2) ◽  
pp. 135-144 ◽  
Author(s):  
Yunqing Huang ◽  
Jichun Li
Keyword(s):  
Wave Propagation ◽  
Total Reflection ◽  
Total Transmission ◽  
Zero Index

AbstractIn this work, we investigate wave propagation through a zero index meta-material (ZIM) waveguide embedded with triangular dielectric defects. We provide a theoretical guidance on how to achieve total reflection and total transmission (i.e., cloaking) by adjusting the defect sizes and/or permittivities of the defects. Our work provides a systematical way in manipulating wave propagation through ZIM in addition to the widely studied dielectric defects with cylindrical and rectangular geometries.

Acoustic total transmission and total reflection in zero-index metamaterials with defects

2013 ◽  
Vol 102 (17) ◽  
pp. 174104 ◽  
Author(s):  
Qi Wei ◽  
Ying Cheng ◽  
Xiao-jun Liu
Keyword(s):  
Total Reflection ◽  
Total Transmission ◽  
Zero Index

scholarly journals Total transmission and total reflection of acoustic wave by zero index metamaterials loaded with general solid defects

2013 ◽  
Vol 114 (19) ◽  
pp. 194502 ◽  
Author(s):  
Ziyu Wang ◽  
Fan Yang ◽  
LiBing Liu ◽  
Ming Kang ◽  
Fengming Liu
Keyword(s):  
Acoustic Wave ◽  
Total Reflection ◽  
Total Transmission ◽  
Zero Index

scholarly journals Total-transmission and total-reflection of individual phonons in phononic crystal nanostructures

APL Materials ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 040703
Author(s):  
Pengfei Jiang ◽  
Yulou Ouyang ◽  
Weijun Ren ◽  
Cuiqian Yu ◽  
Jia He ◽  
...  
Keyword(s):  
Phononic Crystal ◽  
Total Reflection ◽  
Total Transmission

Determination of Oxygen and Nitrogen in Various Materials by X-Ray Fluorescence Spectrometry

1983 ◽  
Vol 27 ◽  
pp. 547-556 ◽  
Author(s):  
T. Arai ◽  
S. Ohara
Keyword(s):  
Bragg Reflection ◽  
Total Reflection ◽  
Fluorescence Spectrometry ◽  
X Rays ◽  
Spectrographic Analysis ◽  
X Ray ◽  
The Past ◽  
Detector Window ◽  
High Absorption

Spectrographic analysis for carbon and boron using fluorescent x-rays has been studied over the past few years; principles and applications for using those ultra-soft x-rays were described, based on the combination of total reflection and filtering rather than on the wavelength dispersive method of Bragg reflection (1, 2). However, oxygen and nitrogen, with x-ray wavelengths of 23.7lÅ and 31.60Å, respectively, cannot be detected as easily because of their high absorption by the detector window materials such as polypropylene, polyester or formvar films.

scholarly journals Exploring Metamaterials’ Structures Through the Relaxed Micromorphic Model: Switching an Acoustic Screen Into an Acoustic Absorber

2021 ◽  
Vol 7 ◽  
Author(s):  
Gianluca Rizzi ◽  
Manuel Collet ◽  
Félix Demore ◽  
Bernhard Eidel ◽  
Patrizio Neff ◽  
...  
Keyword(s):  
Incident Wave ◽  
Characteristic Length ◽  
Dynamic Properties ◽  
Static Characteristic ◽  
Total Reflection ◽  
Homogeneous Material ◽  
Structural Elements ◽  
Challenging Problem ◽  
Total Transmission ◽  
Extended Frequency

While the design of always new metamaterials with exotic static and dynamic properties is attracting deep attention in the last decades, little effort is made to explore their interactions with other materials. This prevents the conception of (meta-)structures that can enhance metamaterials’ unusual behaviors and that can be employed in real engineering applications. In this paper, we give a first answer to this challenging problem by showing that the relaxed micromorphic model with zero static characteristic length can be usefully applied to describe the refractive properties of simple meta-structures for extended frequency ranges and for any direction of propagation of the incident wave. Thanks to the simplified model’s structure, we are able to efficiently explore different configurations and to show that a given meta-structure can drastically change its overall refractive behavior when varying the elastic properties of specific meta-structural elements. In some cases, changing the stiffness of a homogeneous material which is in contact with a metamaterial’s slab, reverses the structure’s refractive behavior by switching it from an acoustic screen (total reflection) into an acoustic absorber (total transmission). The present paper clearly indicates that, while the study and enhancement of the intrinsic metamaterials’ properties is certainly of great importance, it is even more challenging to enable the conception of meta-structures that can eventually boost the use of metamaterials in real-case applications.

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