Multiple-wavelength conversion based on the anomalous Doppler effect induced by dynamic tuning in a self-collimation photonic crystal

2019 ◽  
Vol 100 (1) ◽  
Author(s):  
Xingping Zhou ◽  
Samit Kumar Gupta ◽  
Guangxu Su ◽  
Peng Zhan ◽  
Minghui Lu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Doppler Effect ◽  
Wavelength Conversion ◽  
Dynamic Tuning ◽  
Multiple Wavelength ◽  
Anomalous Doppler Effect

scholarly journals Research Progress and Development Trends of Acoustic Metamaterials

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4018
Author(s):  
Hao Song ◽  
Xiaodong Ding ◽  
Zixian Cui ◽  
Haohao Hu
Keyword(s):  
Doppler Effect ◽  
Negative Refraction ◽  
Development Trend ◽  
Atomic Clusters ◽  
Research Progress ◽  
Acoustic Metamaterials ◽  
Development Trends ◽  
Related Research ◽  
The Past ◽  
Anomalous Doppler Effect

Acoustic metamaterials are materials with artificially designed structures, which have characteristics that surpass the behavior of natural materials, such as negative refraction, anomalous Doppler effect, plane focusing, etc. This article mainly introduces and summarizes the related research progress of acoustic metamaterials in the past two decades, focusing on meta-atomic acoustic metamaterials, metamolecular acoustic metamaterials, meta-atomic clusters and metamolecule cluster acoustic metamaterials. Finally, the research overview and development trend of acoustic metasurfaces are briefly introduced.

Resonant generation of electromagnetic surface wave by inhomogeneous relativistic electron stream

1981 ◽  
Vol 26 (3) ◽  
pp. 509-515 ◽  
Author(s):  
V. M. Čadež ◽  
S. Vuković ◽  
V. V. Frolov ◽  
A. Yu. Kyrie
Keyword(s):  
Surface Wave ◽  
Growth Rates ◽  
Doppler Effect ◽  
Maximal Growth ◽  
Electron Stream ◽  
Particle Flows ◽  
Anomalous Doppler Effect ◽  
Excitation Mechanisms ◽  
Resonant Generation ◽  
Cerenkov Effect

Generation of electromagnetic surface waves by relativistic inhomogeneous particle flows is investigated for plane and cylindrical geometries. The basic excitation mechanisms are shown to be the induced anomalous Doppler effect and the hydrodynamic Čerenkov effect. The relevant maximal growth rates may differ significantly from those derived for monoenergetic beams.

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