摘要
为了实现宽频透射,设计了内嵌矩形腔的楔形金属狭缝结构,并用有限元方法研究了其透射特性。结果表明,内嵌矩形腔的楔形金属狭缝阵列在红外范围内可以实现宽带、广角度的增强传输,并且与直缝结构对比光是强烈局域在狭缝出口处。用传输线理论来描述这种现象。此外,还讨论了入射极化角度、狭缝入口宽度、楔形狭缝的中心偏置等因素对透射的影响。这些结果对光信号传输、宽带传输和近场光采集装置的设计具有一定的指导意义。
To achieve nonresonant broadband extraordinary optical transmission(EOT), tapered metallic slits array embedded with rectangular cavities structure was proposed and its transmission properties were investigated using the finite element method(FEM). The results show that tapered metallic slits array embedded with rectangular cavities can achieve broadband and wide-angle enhanced transmission in the infrared and the light is strongly localized enhanced at the slit exits, in contrast with straight slits structure. The phenomenon was described with a transmission line model. In addition, the effects of incident polarization, the entrance width of the slit, and the centers misalignment of the tapered slits on the transmission property were also studied. These results would be helpful for optical signal transmission and the designing near field light harvesting devices with broadband and strong transmission.
出处
《红外与激光工程》
EI
CSCD
北大核心
2018年第S1期221-226,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(61367005,61741119)
甘肃省自然科学基金(17JR5RA078)
西北师范大学“学生创新能力提升计划”(CX2018Y167)
关键词
光学异常透射
表面等离激元
楔形金属狭缝
有限元法
extraordinary optical transmission
surface plasmon polaritons
tapered metallic slits array
the finite element method
