石墨烯包覆纳米线的双稳态散射
Bistable scattering in graphene-coated dielectric nanowires
摘要：
在非线性等离子体激元中，光学双稳的开关阈值受到常规克尔介质的弱非线性响应的限制。考虑到石墨烯的巨非线性极化率，本文在平均场近似下建立了一个非线性散射模型，并基于半解析解研究了石墨烯包覆的电介质纳米线的双稳态散射。我们发现在工作频率下，双稳态散射的开关强度可以小于1 MW/cm ~ 2。为了进一步降低开关强度，我们表明，最重要的因素，限制的双稳态散射是石墨烯的弛豫时间，而不是化学势和介电纳米线的介电常数。我们的工作不仅揭示了石墨烯双稳态散射的一些一般特性，而且为光学双稳态在高速全光信号处理中的进一步应用提供了指导。
英文摘要：
In nonlinear plasmonics, the switching threshold of optical bistability is limited by the weak nonlinear responses from the conventional Kerr dielectric media. Considering the giant nonlinear susceptibility of graphene, here we develop a nonlinear scattering model under the mean field approximation and study the bistable scattering in graphene-coated dielectric nanowires based on the semi-analytical solutions. We find that the switching intensities of bistable scattering can be smaller than 1MW/cm2 at the working frequency. To further decrease the switching intensities, we show that the most important factor that restricts the bistable scattering is the relaxation time of graphene, rather than the chemical potential and the permittivity of the dielectric nanowire. Our work not only reveals some general characteristics of graphene-based bistable scattering, but also provides a guidance to further applications of optical bistability in the high speed all-optical signal processing.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
