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 super reflection realized by anisotropic zero-index materials

2012 ◽  
Vol 14 (12) ◽  
pp. 123010 ◽  
Author(s):  
Hui Feng Ma ◽  
Jin Hui Shi ◽  
Ben Geng Cai ◽  
Tie Jun Cui
Keyword(s):  
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

scholarly journals Acoustic Supercoupling in a Zero-Compressibility Waveguide

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
H. Esfahlani ◽  
M. S. Byrne ◽  
M. McDermott ◽  
A. Alù
Keyword(s):  
Acoustic Waves ◽  
Phase Distribution ◽  
Channel Length ◽  
Acoustic Mode ◽  
Dominant Mode ◽  
Acoustic Parameters ◽  
Total Transmission ◽  
Additional Challenge ◽  
Acoustic Waveguides ◽  
Zero Index

Funneling acoustic waves through largely mismatched channels is of fundamental importance to tailor and transmit sound for a variety of applications. In electromagnetics, zero-permittivity metamaterials have been used to enhance the coupling of energy in and out of ultranarrow channels, based on a phenomenon known as supercoupling. These metamaterial channels can support total transmission and complete phase uniformity, independent of the channel length, despite being geometrically mismatched with their input and output ports. In the field of acoustics, this phenomenon is challenging to achieve, since it requires zero-density metamaterials, typically realized with waveguides periodically loaded with membranes or resonators. Compared to electromagnetics, the additional challenge is due to the fact that conventional acoustic waveguides do not support a cut-off for the dominant mode of propagation, and therefore zero-index can be achieved only based on a collective resonance of the loading elements. Here we propose and experimentally realize acoustic supercoupling in a dual regime, using a compressibility-near-zero acoustic channel. Rather than engineering the channel with subwavelength inclusions, we operate at the cut-off of a higher-order acoustic mode, demonstrating the realization and efficient excitation of a zero-compressibility waveguide with effective soft boundaries. We experimentally verify strong transmission through a largely mismatched channel and uniform phase distribution, independent of the channel length. Our results open interesting pathways towards the realization of extreme acoustic parameters and their implementation in relevant applications, such as ultrasound imaging, acoustic transduction and sensing, nondestructive evaluation, and sound communications.

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