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Trapping of electromagnetic radiation in self-generated and preformed cavities

Published online by Cambridge University Press:  22 August 2013

Shixia Luan*
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
Wei Yu
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
Jingwei Wang
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
Mingyang Yu
Affiliation:
Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, China; Institute for Theoretical Physics I, Ruhr University, Bochum, Germany
Suming Weng
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
Masakatsu Murakami
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
Jingwei Wang
Affiliation:
Institute of Laser Engineering, Osaka University, Osaka, Japan
Han Xu
Affiliation:
College of Science, National University of Defense Technology, Changsha, China
Hongbin Zhuo
Affiliation:
College of Science, National University of Defense Technology, Changsha, China
*
Address correspondence and reprint requests to: Shixia Luan, No.390, Qinghe Road, Jiading, Shanghai, 201800, China. E-mail: sxluan@siom.ac.cn

Abstract

Laser light trapping in cavities in near-critical density plasmas is studied by two-dimensional particle-in-cell simulation. The laser ponderomotive force can create in the plasma a vacuum cavity bounded by a thin overcritical-density wall. The laser light is self-consistently trapped as a half-cycle electromagnetic wave in the form of an oscillon-caviton structure until it is slowly depleted through interaction with the cavity wall. When the near-critical density plasma contains a preformed cavity, laser light can become a standing wave in the latter. The trapped light is characterized as multi-peak structure. The overdense plasma wall around the self-generated and preformed cavities induced by the laser ponderomotive force is found to be crucial for pulse trapping. Once this wall forms, the trapped pulse can hardly penetrate.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2013 

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References

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