Femtosecond Quasi-Bright Soliton Solution and Its Properties Under Influence of Higher-Order Effects in Metamaterials

BAI Juan1 YANG Rongcao1 TIAN Jinping1

(1.College of Physics and Electronic Engineering, Shanxi University, Taiyuan, Shanxi, China 030006)

【Abstract】Based on the higher-order nonlinear Schrödinger equation describing ultrashort pulse transmission in metamaterials, this study presents an exact femtosecond quasi-bright soliton solution and determines its existence conditions by using the traveling wave method. When the group speed dispersion, third-order dispersion, cubic-quintic nonlinearities, self-steepening, and second-order nonlinear dispersion effects are properly balanced, the femtosecond quasi-soliton can exist in nonlinear metamaterials. Without the third-order dispersion and second-order nonlinear dispersion, the soliton in metamaterials can not occur. Based on the Drude model, the existence index regions of the femtosecond quasi-bright soliton are discussed in different nonlinear metamaterials. The results show that femtosecond quasi-soliton can exist in the negative index region of self-defocusing nonlinear metamaterials, and in the positive index region of self-focusing nonlinear metamaterials. Moreover, the intensities and widths of the solitons differ in different regions of the metamaterials, implying that the properties of the formed solitons can be adjusted by choosing different nonlinear metamaterials and different frequencies of the incident wave, making them in the corresponding existence areas.

【Keywords】 nonlinear optics; femtosecond quasi-bright soliton; self-defocusing; self-focusing; nonlinear metamaterials; negative refraction;

【DOI】

【Funds】 National Natural Science Foundation of China (61775126) Shanxi Provincial Natural Science Foundation (201801D221164, 201801D121119)

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(Translated by CHENG H)

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This Article

ISSN:0253-2239

CN: 31-1252/O4

Vol 40, No. 02, Pages 152-158

January 2020

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Article Outline

Abstract

  • 1 Introduction
  • 2 Theoretical model and femtosecond quasi-bright soliton solution
  • 3 Existence interval and characteristics of femtosecond quasi-soliton solutions
  • 4 Conclusion
  • References