中国物理B ›› 2005, Vol. 14 ›› Issue (10): 2033-2040.doi: 10.1088/1009-1963/14/10/019
• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇 下一篇
林旭升1, 陈雄文1, 兰胜2
Lin Xu-Sheng (林旭升)a, Chen Xiong-Wen (陈雄文)a, Lan Sheng (兰胜)b
摘要: The analytical expression for the transmission spectra of coupled cavity waveguides (CCWs) in photonic crystals (PCs) is derived based on the coupled-mode theory (CMT). Parameters in the analytical expression can be extracted by simple numerical simulations. We reveal that it is the phase shift between the two adjacent PC defects that uniquely determines the flatness of the impurity bands of CCWs. In addition, it is found that the phase shift also greatly affects the bandwidth of CCWs. Thus, the engineering of the impurity bands of CCWs can be realized through the adjustment of the phase shift. Based on the theoretical results, an interesting phenomenon in which a CCW acts as a single PC defect and its impurity band possesses a Lorentz lineshape is predicted. Very good agreement between the analytical results and the numerical simulations based on transfer matrix method has been achieved.
中图分类号: (Photonic bandgap materials)