Gan Qiaoqiang, Fu Zhan, Ding Yujie J, Bartoli Filbert J
Center for Optical Technologies, Electrical and Computer Engineering Department, Lehigh University, Bethlehem, PA 18015, USA.
Opt Express. 2007 Dec 24;15(26):18050-5. doi: 10.1364/oe.15.018050.
We have conducted a feasibility study of a frequency splitter operating at THz frequencies, based on a bidirectional subwavelength slit simulated using two-dimensional finite difference time domain (FDTD) techniques. The near-field wave emanating from the narrow slit serves as a subwavelength-scaled excitation source. By placing two optimized grating structures on the opposite sides of the slit, the THz waves at different frequencies are guided in the two desired directions. Confinement of the optical field is illustrated for different surface structures.
我们基于使用二维有限差分时域（FDTD）技术模拟的双向亚波长狭缝，对太赫兹频率下的分频器进行了可行性研究。从窄缝发出的近场波用作亚波长尺度的激发源。通过在狭缝的相对两侧放置两个优化的光栅结构，不同频率的太赫兹波被引导到两个期望的方向。针对不同的表面结构说明了光场的限制情况。
