论文部分内容阅读
太赫兹调制器、滤波器、吸收器是太赫兹波应用领域的关键器件,而金属开口谐振环是这些器件的常用结构。通过仿真及实验的手段,系统地比较了不同亚波长金属开口谐振环结构的太赫兹波吸收特性。设计并制备两种不同形式的亚波长金属谐振环,利用时域有限差分(FDTD)的模拟方法与光泵浦太赫兹探测(OPTP)的实验方法,分析了电磁波入射谐振环时,TM与TE模式下的太赫兹透射特性。发现在TM模式下,吸收峰峰值均反比于谐振环的等效电容值与等效电感值。而在TE模式下,由于偶极子振荡长度相同导致了两种谐振环吸收峰峰值相近。此外,改变外部光激励条件时实验结果表明TM模式下,单开口环比双开口环对光激励更敏感:泵浦光功率为5 m W相比无泵浦光时,单开口环透射率增加了80%,而双开口环透射率仅增加了43%。
Terahertz modulators, filters, and absorbers are the key components in terahertz applications, and metal-opening resonators are common structures for these devices. By means of simulation and experiment, the terahertz wave absorption characteristics of metal subharmonic resonant ring structures with different subwavelengths are systematically compared. Two different types of subwavelength metal resonant rings are designed and fabricated. By using FDTD simulation method and optical pumping terahertz (OPTP) experimental method, the relationship between TM and TE Terahertz transmission characteristics of the mode. It is found that in the TM mode, the absorption peaks and peaks are inversely proportional to the equivalent capacitance and the equivalent inductance of the resonant ring. In the TE mode, the absorption peaks of the two kinds of resonant rings are similar due to the same dipole oscillation length. In addition, the experimental results show that in the TM mode, the single-opening ring is more sensitive to photo-excitation than the double-opening ring when the pumping light power is 5 mW, and the transmittance of the single-opening ring increases 80%, while the double-opening ring transmittance increased by only 43%.