Anomalous Wave Propagation in Topological Transition Metasurfaces

2019 ◽  
Vol 7 (11) ◽  
pp. 1801483 ◽  
Author(s):  
Peixia Zheng ◽  
Quan Xu ◽  
Xiaoqiang Su ◽  
Dongyang Wang ◽  
Yuehong Xu ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Topological Transition ◽  
Anomalous Wave

Laser ultrasonic anomalous wave propagation imaging method with adjacent wave subtraction: Algorithm

2012 ◽  
Vol 44 (5) ◽  
pp. 1507-1515 ◽  
Author(s):  
Jung-Ryul Lee ◽  
Chen Ciang Chia ◽  
Chan-Yik Park ◽  
Hyomi Jeong
Keyword(s):  
Wave Propagation ◽  
Imaging Method ◽  
Laser Ultrasonic ◽  
Anomalous Wave

Tunable and programmable topological valley transport in photonic crystals with liquid crystals

2022 ◽  
Author(s):  
Yulin Zhao ◽  
Feng Liang ◽  
Xiangru Wang ◽  
Deshuang Zhao ◽  
Bing-Zhong Wang
Keyword(s):  
Wave Propagation ◽  
Liquid Crystals ◽  
Photonic Crystals ◽  
Symmetry Breaking ◽  
Relative Permittivity ◽  
Nematic Liquid Crystals ◽  
Inversion Symmetry ◽  
Edge States ◽  
Beam Splitting ◽  
Topological Transition

Abstract Topological valley transport in photonic crystals (PCs) has attracted great attention owing to its edge modes immune to backscattering. However, flexibly dynamically controlling and reconfiguring the pathway of the topological one-way propagation is still challenging. Here, we propose a tunable and programmable valley PC structure based on nematic liquid crystals (LCs). Inversion symmetry breaking and topological transition are implemented through controlling the relative permittivity of the LC cells. Topological protection of valley edge states and valley-locked beam splitting are demonstrated. Moreover, the LC-based PC can be discretized to a number of supercells, each of which can be coded with “0” or “1”. The wave propagation pathway can be dynamically reconfigured by programming different coding patterns.

Aircraft Wing Inspection Based on Anomalous Wave Propagation Imaging

2010 ◽  
Vol 123-125 ◽  
pp. 879-882 ◽  
Author(s):  
Jung Ryul Lee ◽  
Chen Ciang Chia ◽  
Hye Jin Shin ◽  
Jong Heon Kim ◽  
Chan Yik Park
Keyword(s):  
Wave Propagation ◽  
Health Management ◽  
Impact Damage ◽  
Engineering Structures ◽  
Structural Health ◽  
Non Destructive Evaluation ◽  
Anomalous Wave ◽  
Structural Health Management ◽  
The Impact ◽  
Non Destructive

Non-destructive evaluation (NDE) and structural health management (SHM) with the ability to evaluate the severity of a damage are important to ensure the reliability of a structure. We propose a local non-destructive evaluation (NDE) system based on Anomalous Wave Propagation Imaging (AWPI) method. When possible damage is flagged during the lifecycle of the structure, the proposed system will be launched for automatic damage evaluation. This technology was demonstrated on a CFRP skin-spar-stringers wingbox integrated with an AE sensor. 17 mm diameter impact damage was made between the stringers using hammer strike from outer surface of the skin. Based on the impact location determined by other global structural health monitoring system, the AWPI automatically inspects an area 400×400 mm2 with the impacted location enclosed. Anomalous Wave Propagation Movie (AWPM) was generated as inspection result. As contrast to its predecessor, the AWPM shows only the damage induced ultrasonic wave (anomalous wave), making the damage detection an intuitive decision making process. Precise damage localization was performed by identifying the location of area with anomalous wave propagation in the AWPM. Besides, the size of the area with anomalous wave agreed well with the size of impact damage, which demonstrated that damage size quantification is possible using the proposed system. Being sensitive only to anomalous wave, it is expected that this NDE system is exceptionally suitable not only for aircraft structures such as wingbox with stiffeners, but also for other complex engineering structures.

scholarly journals Anomalous wave propagation in quasiisotropic media

2006 ◽  
Vol 267 (1) ◽  
pp. 271-277 ◽  
Author(s):  
Hailu Luo ◽  
Weixing Shu ◽  
Fei Li ◽  
Zhongzhou Ren
Keyword(s):  
Wave Propagation ◽  
Anomalous Wave
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