金属狭缝填充非线性材料光分束特性的FDTD模拟

FDTD Simulation on Optical Beam Splitting Properties via Metal Nanoslits Containing Nonlinear Materials

设计并优化了基于金属狭缝填充非线性材料的光分束器。利用时域有限差分法,数值模拟850 nm TM波经填充非线性光学材料InGaAsP的亚波长银薄膜狭缝结构的光分束特性,结果表明:仅仅通过调整金属狭缝宽度、数量或排列顺序,便可调制该光分束器输出端口数量或能量分布;改变入射光强,可动态调控输出端口数量。设计的七缝对称结构具有1×5对称光分束特性。该器件具有动态可调、结构相对简单、输出端口较多等特点,在微纳光子集成和光通信中有潜在应用价值。

The optical beam splitter based on metal nanoslits containing nonlinear materials is designed and op timized.Finite-difference time-domain（FDTD） method is employed to numerically simulate optical beam splitting properties of TM-polarized plane wave with a wavelength of 850 nm via subwavelength silver nanoslits containing nonlinear materials InGaAsP.The results show that the number of output ports or energy distribution can be adjust ed simply by changing the width,number or order of the nanoslits.The number of output ports can be dynamically controlled by changing the intensity of incident light.The symmetric structure of seven nanoslits possesses 1×5 symmetric optical beam splitting properties.Due to the more compact architecture,more output ports and the dy namical control method,the devices are important for potential applications in micro-nano photonic integration and optical communication.