排序方式: 共有57条查询结果,搜索用时 116 毫秒
31.
32.
33.
34.
35.
36.
A method to realize absolute negative refraction index -1 with a two-dimensional (2D) photonic crystal is presented by introducing dielectric anisotropy in the photonic crystal material. The band structures of E-polarization mode and H-polarization mode can be adjusted by changing the parameters of materials. Thus the two modes with different polarizations have the same negative refraction index -1 for the same frequency. The results are demonstrated by numerical simulation based on the finite-difference time-domain (FDTD) method. 相似文献
37.
一种新型光子晶体双色谐振腔 总被引:2,自引:0,他引:2
提出一种新型的光子晶体双色谐振腔,以光学传输矩阵法为基础给出了设计的关键参量及其优化方法,并分析了其物理原理.根据常用的650nm/780nm,532nm/671nm,1079nm/1320nm和1 064 nm/1 319 nm等双色激光谱线,设计了4个光子晶体双色谐振腔结构.这种一维光子晶体谐振腔只需要一个谐振腔,缺陷层两侧周期数为5层时,该腔体总厚度小于5 μm,可获品质因子为103~104,相对带宽为10-4~10-5的双色谱线,且模式纯净,基于基模谐振. 相似文献
38.
The embedded atom method is used to study the structure stability of gold nanobelt. The Au nanobelts have a rectangular cross-section with (100) orientation along the x^-,γ- and z-axes. Free surfaces are used along the x- and y-directions, and periodic boundary condition is used along z-direction. The simulation is performed at different temperatures and cross-section sizes. Our results show that the structure stability of the Au nanobelts depends on the nanobelt size, initial orientation, boundary conditions and temperature. A critical temperature exists for Au nanobelts to transform from initial (100) nanobelt to final (110) nanobelt. The mechanism of the reorientation is the slip and spread of dislocation through the nanobelt under compressive stress caused by tensile surface-stress components. 相似文献
39.
40.