中文摘要：

采用模拟退火算法设计了0．2～2．0THz和0．2～3．0THz两个波段下的消色差复合太赫兹λ／4波片，在0．2～2．0THz波段内实现了波片相位延迟偏差小于2％，在0．2～3．0THz波段内波片相位延迟偏差小于4％。系统分析了不同石英玻片个数对消色差复合太赫兹波片的消色差性能以及厚度和损耗等关键参量的影响。分析表明，随着石英玻片个数的增加，波片的消色差性能也会变好，在相应太赫兹波段相位延迟失谐量也随之减小；但同时，波片的厚度也随之增加，导致对太赫兹波的损耗增加。在0．2～2．0THz和0．2～3．0THz范围内，太赫兹λ／4波片采用5个玻片为最佳，此时可以获得较好的消色差性能，同时波片的厚度和损耗也在可实际应用范围内。

英文摘要：

Based on simulated annealing algorithm, the terahertz composite achromatic quarter-wave plate is designed for two frequency bands, 0. 2-2.0 THz and 0.2-3.0 THz bands. Remarkable design results （retardation deviation is 2% from 0. 2 to 2.0 THz and retardation deviation is 4% from 0.2 to 3.0 THz） are got. The influence of different numbers of quartz plates on the key parameters of the quarter-wave plate, such as achromatic performance, thickness and loss is analyzed. It is shown that with the increase of the number of quartz plates, the achromatic performance of the quarter-wave plate will be improved and phase delay detuning will also be reduced showever, the thickness of the quarter-wave plate is increased, leading to the increase of the loss. It is also shown that the optimized quartz plate number is five, with which good achromatic performance can be got, and the thickness and the loss are also practical for THz application.