Lee Huang-Ming, Shyu Jia-Hong, Horng Lance, Wu Jong-Ching
Department of Physics, National Changhua University of Education, Changhua 500, Taiwan.
Appl Opt. 2011 Jul 20;50(21):3860-4. doi: 10.1364/AO.50.003860.
We numerically analyze the optical properties of a two-dimensional (2D) superconducting Bragg reflector (SBR) using the finite element method in conjunction with a two-fluid model. It is found that the wavelength-dependent reflectance spectra of the proposed 2D SBR are strongly dependent on the polarizations of incident light and can be parametrically tuned by the system temperature and the geometric parameters of embedded dielectric rods. Taking advantage of the dispersive superconductor with its zero-refractive index characteristic and the structural periodicity of the proposed superconducting structure, narrow passband filters can be generated near the threshold wavelength. Furthermore, the narrow passband features of the 2D SBR are found to be sustained up to a very large angle of incidence. The extraordinary optical properties imply that the proposed 2D SBR may be applied to the design of an omnidirectional narrowband transmission filter.
我们结合双流体模型，使用有限元方法对二维（2D）超导布拉格反射器（SBR）的光学特性进行了数值分析。结果发现，所提出的二维SBR的波长相关反射光谱强烈依赖于入射光的偏振，并且可以通过系统温度和嵌入式介质棒的几何参数进行参数调谐。利用具有零折射率特性的色散超导体和所提出的超导结构的结构周期性，可以在阈值波长附近生成窄带通滤波器。此外，发现二维SBR的窄带通特性在非常大的入射角下仍然保持。这些非凡的光学特性表明，所提出的二维SBR可应用于全向窄带传输滤波器的设计。
