一维金属-介质周期结构的自准直特性和亚波长成像  

Analysis of self-collimation and subwavelength imaging in one-dimensional metal-dielectric structure

作　　者：张锦龙[1] 刘旭[1] 厉以宇[1] 李明宇[1] 顾培夫[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,杭州310027

出　　处：《物理学报》2007年第10期6075-6079,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展规划(973)项目(批准号:2004CB19803);国家自然科学基金(批准号:60608014)资助的课题~~

摘　　要：计算了一维金属-介质周期结构(1DMD)的色散曲线,利用传输矩阵法模拟了该结构对入射高斯光束的自准直作用,着重讨论了金属层吸收的影响;对该结构在半波长厚度时近场成像特性进行了分析,单光源的成像分辨率为λ/8,达到亚波长分辨效果;分辨率随着光源逐渐远离近场范围而降低.双狭缝的成像模拟进一步验证了1DMD结构的近场亚波长成像能力,分辨率达到λ/3.The dispersion curve of one-dimensional metal-dielectric structure is calculated, and the finite-difference time-domain （FDTD） method is used to simulate the self-collimation in one-dimensional metal-dielectric structure, to which a Gaussian beam is incident at different angles. The influence of the dissipation of the metal layer on self-collimation is discussed. Subwavelength imaing with the one-dimensional metal-dielectric structure is also analyzed. The resolution of λ/8 is achieved for single point source when the thickness of 1DMD is equal to λ/2. The resolution will gradually degrade as the source moves beyond the near- field domain. Imaging with double slits source is also demonstrated, and a resolution of λ/3 is achieved.

关 键 词：光子晶体 自准直 亚波长成像 金属-介质层 

分 类 号：O482[理学—固体物理]