缺陷态透射率可调的三缺陷层的一维光子晶体  

Tunable Transmittance of Defect Modes in One-dimensional Photonic Crystal with 3 Defects

作　　者：刘丹东[1] 陈光德[1] 李普选[1] 孙中禹[2] 

机构地区：[1]西安交通大学理学院,西安710049 [2]空军工程大学信息工程学院,西安710077

出　　处：《光子学报》2006年第2期286-289,共4页Acta Photonica Sinica

摘　　要：利用传输矩阵方法,从理论上研究了三缺陷层一维光子晶体的光学性质.在缺陷层间距足够大以致于出现缺陷态简并的情况下,调节第一或第三个缺陷层的光学厚度,光子晶体缺陷态的透射率会发生最大程度的变化.这种结构可同时具有窄带滤波器和光开关的功能,据此提出了一种低阈值光开关的设计.把折射率可调的向列型液晶作为晶体的第三个缺陷层,并用4×4传输矩阵方法计算了其缺陷态透射率与电场电压的关系.By propagation matrix method, the property of one-dimensional photonic crystals with 3 defects was analyzed. On condition that the distance between adjacent defects in the photonic crystals was long enough for a degenerate defect mode to be produced, transmittance of the degenerate defect mode can be tuned to the full extent by a change of the optical path of one of defect layers in the photonic crystal. Nematic liquid crystal was introduced as one of the defect layers. As a result, the transmittance of the degenerate defect mode in the structure can be tuned by a change of the refractive index of the liquid crystal upon the application of an electric field. For the system, the maximum of transmittance was 1 and the minimum approachd 0, which were calculated by 4× 4 propagation matrix. Possible applications of this system were discussed,especially in the field of communication where a optic switch can be produced.

关 键 词：光子晶体 缺陷态 光开关 滤波 

分 类 号：O734[理学—晶体学]