中文摘要：

采用时域有限差分方法研究了纳米狭缝的宽度,圆孔半径、矩形的长和宽对纳米狭缝耦合金属圆-矩形复合孔阵列结构增强光透射特性的影响。研究发现该结构与圆孔阵列、圆-矩形复合孔阵列两种结构相比较,光的透射率得到了显著的增加,这表明本文提出的纳米狭缝耦合金属圆-矩形复合孔阵列结构中的表面等离激元和局域表面等离激元两种模式相互耦合起了关键作用。纳米狭缝宽度是影响光透射的主要因素,纳米狭缝宽度为55 nm时,透射率达到89%,半宽度达129 nm;圆孔半径、矩形孔的长和宽、周围环境介电常数等参数也影响透射率与共振峰位置：随着圆孔半径、矩形孔宽度的增大,透射率明显增强,同时共振峰蓝移;随着矩形孔长度和周围环境介电常数的增加,共振峰有规律的红移。

英文摘要：

The effects of the radius of the circle, the length and width of the rectangular and the width of the nano-slit on extraordinary optic transmission of metallic circle -rectangular compound hole array with nano-slit coupling are investigated using the finite-difference time-domain method. The results show that, compared to circle hole array and circle-rectangular compound hole array, the transmittance of the optical transmission for the structure is significantly increased, which suggests that coupling effect of surface pasmon polartion and localized surface plasmon by nano-slit is the key role. The main factor that affects the optic transmission is the width of the nano-slit, and the transmittance is 89% and the full width at half maximum is 129 nm when the width of the nano-slit is 55 nm; the parameters such as the radius of the circle, the width of the rectangular and the dielectric constant of the surrounding environment, are also the factors that affect the transmission and the position of the resonance peak with the increase of the radius of the circle and the width of the rectangular, the transmission intensity is obviously enhanced, and the blue shift of the resonance peak. The red shift of the resonance peak is accompanied with the increase of the dielectric constant of the surrounding environment and the length of the rectangular.