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arXiv physics/0606199physics.optics
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波导磁光晶体的带边效应和简正模传播

Band Edge Effects and Normal Mode Propagation in Waveguide Magnetophotonic Crystals

Miguel Levy, Rong Li, Amir A. Jalali, Xiaoyue Huang

摘要:

研究了脊形波导磁光子晶体的带边现象。简正模分析用于研究近带边缘和布拉格中心波长群速度及其与偏振的关系。在(111)钆镓石榴石(GGG)衬底上的液相外延(LPE)BiLuIG膜上通过聚焦离子束铣削图案化的布拉格光栅中观察到与输入的大偏振偏离。在光子晶体中的光谱响应的传输矩阵分析允许从测量的透射率和偏振旋转确定椭圆偏振的正常模式的相位。与非双折射法拉第旋转器不同,在偏振旋转和法向模相位差之间存在非线性关系。在带边附近和谐振腔中心波长处,发现左右椭圆偏振的简正模之间存在较大的相位差和光学慢化。分析和比较了这两种系统的驻波光子捕获和光学慢化。

英文摘要:

A study of band edge phenomena in ridge waveguide magnetophotonic crystals is presented. Normal mode analysis is used to examine the near-band edge and Bragg center-wavelength group velocities and their relation to the polarization. Large polarization departures from the input are observed in Bragg gratings patterned by focused-ion-beam milling on liquid-phase-epitaxial (LPE) BiLuIG films on (111) gadolinium gallium garnet (GGG) substrates. Transfer matrix analysis of the spectral response in the photonic crystals allows the determination of the phase of the elliptically polarized normal modes from measured transmittances and polarization rotation. Unlike non-birefringent Faraday rotators a non-linear-relation exists between polarization rotation and the normal mode phase difference. Large phase differences between right- and left-elliptically polarized normal modes and optical slow-down are found near the band edges and at the resonant cavity center-wavelength. Standing-wave photon trapping and optical slow-down are analyzed and compared for these systems.

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