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利用表面等离子体调控光束传输,在微纳集成光学及光通信领域有广泛应用。提出了一种狭缝中填充液晶的金属微纳阵列结构理论设计。利用表面等离子体传输效应,通过设定狭缝宽度、外加电场改变液晶的方位角控制相位延迟等参数,设计不同新颖效果的金属微纳光学透镜。利用时域有限差分(FDTD)法对三狭缝、六狭缝及五狭缝阵列结构进行数值模拟表明,上述结构分别实现光束偏转、光分束及光聚焦效果。偏转角、分束角及焦点位置随着狭缝宽度及方位角的改变而变化,从而实现对光束的调控作用。设计结构简单,可以通过电子束刻蚀系统等实验设备加工,具有较好的应用前景。
The use of surface plasmons to control beam transmission has wide applications in the fields of micro-nano integrated optics and optical communications. A theoretical design of a metal micro-nano array structure filled with liquid crystal in a slit is proposed. Using the surface plasmon transmission effect, the metal micro / nano optical lens with different novel effects is designed by setting the slit width and changing the azimuth angle of the liquid crystal to control the phase delay and other parameters. The numerical simulation of three-slot, six-slot and five-slot array structures using finite-difference time-domain (FDTD) method shows that the above structures respectively realize beam deflection, beam splitting and light focusing. Deflection angle, beam splitting angle and focus position with the slit width and azimuth changes, in order to achieve the regulation of the beam. The design of the structure is simple, can be processed by electron beam etching system and other experimental equipment, has a good application prospect.