Huang Yang, Wu Ya Min, Gao Lei
Opt Express. 2017 Jan 23;25(2):1062-1072. doi: 10.1364/OE.25.001062.
We carry out a theoretical study on optical bistability of near field intensity and transmittance in two-dimensional nonlinear composite slab. This kind of 2D composite is composed of nonlocal metal/Kerr-type dielectric core-shell inclusions randomly embedded in the host medium, and we derivate the nonlinear relation between the field intensity in the shell of inclusions and the incident field intensity with self-consistent mean field approximation. Numerical demonstration has been performed to show the viable parameter space for the bistable near field. We show that nonlocality can provide broader region in geometric parameter space for bistable near field as well as bistable transmittance of the nonlocal composite slab compared to local case. Furthermore, we investigate the bistable transmittance in wavelength spectrum, and find that besides the input intensity, the wavelength operation could as well make the transmittance jump from a high value to a low one. This kind of self-tunable nano-composite slab might have potential application in optical switching devices.
我们对二维非线性复合平板中近场强度和透过率的光学双稳性进行了理论研究。这种二维复合材料由随机嵌入主体介质中的非局域金属/克尔型电介质核壳内含物组成，我们用自洽平均场近似推导了内含物壳层中场强与入射场强之间的非线性关系。进行了数值演示以展示双稳近场的可行参数空间。我们表明，与局域情况相比，非局域性可为非局域复合平板的双稳近场以及双稳透过率在几何参数空间中提供更宽的区域。此外，我们研究了波长光谱中的双稳透过率，发现除了输入强度外，波长操作也可使透过率从高值跃变为低值。这种自调谐纳米复合平板可能在光开关器件中有潜在应用。
