基于散射矩阵方法的金属光子晶体薄膜异常光学透射研究

散射矩阵方法是一种基于频域的研究方法.将散射矩阵方法用于亚波长周期性金属小孔结构的透射特性研究.以金属铜薄板为研究对象,薄板刻蚀方格子光子晶体空气圆孔;用洛伦兹-德鲁德(Lorentz-Drude)模型来表征铜的介电常数ε;对不同的薄板厚度、周期大小和空气孔孔径的结构进行透射谱分析.并与时域有限差分方法计算所得结果相对...     

Phase Effect on Guided Resonance in Photonic Crystal Slabs

Phase effect on the guided resonances in photonic crystal slabs is analysed. We present an analysis in the case of a mirror symmetric system and an asymmetric system irradiated from both sides, as well as the more realistic and interesting case of a system bounded from one side by a perfect mirror. Gain is incorporated in the system, mainly to exemplify the results. Finally we find that phase effects persist in the asymmetric system resulting in a periodic response for the reflectivity versus the distance from the mirror, which is the main parameter controlling the phase relationship between the two incident waves.     

Dispersion compensation based on the combination of coupled ring resonator and photonic crystal structures

An optical delay line of coupled resonator optical waveguide(CROW) compensated by photonic crystal waveguide(PhCW) is proposed. In the structure,etching the periodic holes around the waveguide of the ring resonator waveguide does not increase the size of the CROW. Theoretical studies and numerical models indicate that through careful design,CROW and PhCW exhibit different group velocity dispersion(GVD) properties at a certain frequency range. Optical signal can not only be compensated in terms of GVD,but can also be delayed with longer time period. Due to the propagation mode mismatch of the two structures,optical loss becomes inevitable.