在带隙附近存在四个表面态带，其中的两个占有表面态带已由价带的同步辐射光电子能谱实验得到证实。
There are four surface state bands in the gap. Among them, two occupied surface state bands have been confirmed by valence band spectra of synchrotron radiation photoelectron spectroscopy.
结果表明，-U中心的存在使激发谱“能隙”内出现很小值的态密度。
Results show that a small density of states due to the -U centers exists in the region of "energy gap".
传输谱和弯曲特性测试表明布拉格光纤样品具有两个明显的传输波段，体现了带隙导光的特征。
The measurements of the fiber sample demonstrate its bandgap-guided properties, showing two obvious bandgap guided transmission bands.
由于腔场压缩的出现与光子晶体带隙的共同作用，腔场发射谱的线宽变窄。
The spectral linewidth narrowing is due to the common effect of squeezing and the radiation reservoir of the photonic band gap.
提出了用正、负折射率介质层交替排列构成的一维光子晶体模型，并且用传输矩阵法计算了该模型的透射谱，从理论上分析了其带隙结构。
Plane wave expansion techniques and transfer matrix method are used to study the two-dimensional photonic crystal with a triangular lattice of dielectric cylinders in air.
提出了用正、负折射率介质层交替排列构成的一维光子晶体模型，并且用传输矩阵法计算了该模型的透射谱，从理论上分析了其带隙结构。
Plane wave expansion techniques and transfer matrix method are used to study the two-dimensional photonic crystal with a triangular lattice of dielectric cylinders in air.
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