Heat-Induced Soliton Self-Frequency Redshift In The Ultrafast Nonlinear Dynamics Of Active Plasmonic Waveguides
PHYSICAL REVIEW A(2019)
摘要
We investigate the ultrafast nonlinear dynamics of light propagating in an active plasmonic waveguide composed of a thin film of gold sandwiched by two silicon layers immersed in externally pumped Al2O3:Er3+. We model optical propagation in such system through a generalized Ginzburg-Landau equation, finding that heating affects the temporal dynamics of dissipative solitons by inducing a self-frequency redshift accompanied by deceleration in the time domain. We further evaluate the dependence of the self-induced redshift by developing a semianalytical variational approach, providing analytical predictions that are in excellent agreement with direct numerical simulations of the generalized Ginzburg-Landau equation. Our results provide a general understanding of ultrafast nonlinear dynamics in gold-based active plasmonic waveguides, as in particular the spectral shaping properties of propagating optical pulses.
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