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Chin. Phys. B, 2015, Vol. 24(5): 054210    DOI: 10.1088/1674-1056/24/5/054210
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Generation of isolated attosecond pulses in bowtie-shaped nanostructure with three-color spatially inhomogeneous fields

Xue Shan, Du Hong-Chuan, Xia Yue, Hu Bi-Tao
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
Abstract  

We theoretically investigate high-order harmonic generation in a two-color multi-cycle inhomogeneous field combined with a 27th harmonic pulse. By considering a bowtie-shaped gold nanostructure, the spatiotemporal profiles of enhanced plasmonic fields are obtained by solving the Maxwell equation using finite-domain time-difference method. Based on quantum-mechanical and classical models, the effect of 27th harmonic pulse, temporal profile of enhanced plasmonic field and inhomogeneity on supercontinuum generation are analyzed and discussed. As a result, broadband supercontinuum can be generated from our approach with optimized gap size of nanostructure. Moreover, these results are not sensitively dependent on the relative phase in the two-color field.

Keywords:  surface plasmon resonances      high-order harmonics      attosecond pulse      27th harmonic pulse  
Received:  23 August 2014      Revised:  07 November 2014      Published:  05 May 2015
PACS:  42.65.Ky (Frequency conversion; harmonic generation, including higher-order harmonic generation)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
  78.67.Bf (Nanocrystals, nanoparticles, and nanoclusters)  
  33.20.Xx (Spectra induced by strong-field or attosecond laser irradiation)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grants Nos. 11404153, 11175076, 11135002, and 11405077) and the Fundamental Research Funds for the Central Universities of China (Grant Nos. lzujbky-2014-10, lzujbky-2014-13, and lzujbky-2014-14).

Corresponding Authors:  Du Hong-Chuan, Hu Bi-Tao     E-mail:  duhch@lzu.edu.cn;hubt@lzu.edu.cn
About author:  42.65.Ky; 42.65.Re; 78.67.Bf; 33.20.Xx

Cite this article: 

Xue Shan, Du Hong-Chuan, Xia Yue, Hu Bi-Tao Generation of isolated attosecond pulses in bowtie-shaped nanostructure with three-color spatially inhomogeneous fields 2015 Chin. Phys. B 24 054210

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