Zhou Yong Jin, Jiang Quan, Cui Tie Jun
State Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing, 210096, China.
Opt Express. 2011 Mar 14;19(6):5260-7. doi: 10.1364/OE.19.005260.
Bidirectional surface wave splitters excited by a cylindrical wire in the microwave frequency have been proposed and fabricated. Compared to the bidirectional subwavelength-slit splitter, the novelty of the proposed structure is the coupling mechanism from the cylindrical wire to the surface gratings. By designing the grating structures with different depths and the feeding wire, electromagnetic waves at the designed frequencies will be confined and guided in the predetermined opposite directions. The finite integral time-domain method is used to model the splitters. Experimental results are presented in the microwave frequencies to verify the new structure, which have very good agreements to the simulated results. Based on the same coupling mechanism, a bidirectional surface wave splitter excited by a cylindrical wire in the terahertz (THz) frequencies is further been proposed and modeled. The simulation results demonstrate the validity of the THz splitter.
已提出并制作了由圆柱形导线在微波频率下激发的双向表面波分束器。与双向亚波长狭缝分束器相比，所提出结构的新颖之处在于从圆柱形导线到表面光栅的耦合机制。通过设计具有不同深度的光栅结构和馈线，在设计频率下的电磁波将被限制并沿预定的相反方向引导。采用有限积分时域方法对分束器进行建模。给出了微波频率下的实验结果以验证新结构，其与模拟结果非常吻合。基于相同的耦合机制，进一步提出并建模了由圆柱形导线在太赫兹（THz）频率下激发的双向表面波分束器。模拟结果证明了太赫兹分束器的有效性。
