禁带

In addition, broad-linewidth reflection bandstop filter with one-layer grating structure is designed by use of optimization technology for diffractive optical elements and rigorous grating diffractive theory. Finally, rigorous theory is used to analyze photonic crystals for their subwavelength periodic structures.

根据二维光子晶体的结构特点，提出光栅层模型，使二维结构退化为一维结构，从而大大简化了计算过程，提高了计算速度，并编制了计算程序，详细讨论了几类二维光子晶体的禁带特征。

The calculated results indicated central wavelength of impurity mode and whole forbidden band move towards shortwave when incidence angles increase. Remotion of impurity mode of P-wave consist with that of S-wave basically.

研究结果表明，杂质模的中心波长及整个光子禁带随入射角的增加逐渐向短波方向移动，P偏振光和S偏振光的杂质模的移动情况基本一致。

The density of states of 17 kinds of RE doped rutile TiO2 is studied using first-principles density functional theory calculation.

稀土掺杂金红石相TiO2的禁带宽度是其吸收波长的主要影响，进而决定其光催化活性。

Cadmium Selenide is a Ⅱ—Ⅵ compound semiconductor with direct transition, wide-band-gap.

硒化镉是直接跃迁宽禁带隙的Ⅱ—Ⅵ族化合物半导体材料。

Silicon Carbide is the third generation in semiconductor materials.

SiC半导体材料是第三代宽禁带半导体材料。

The calculated results of transmission coefficient indicate that this new method can be applied to compute photonic crystal and total internal reflection.

透射系数的计算结果表明，这种新方法可以很好的用来计算光子晶体禁带以及普通的全反射，对于研究一维光子晶体波导非常方便。

Therefore, it can use the above adjustable factors to attain the adjustive purpose according to the forbidden band needs in practical application.

因此人们可以根据实际应用中的禁带需要利用上述各种可调因素进行调节。

TiO_2 as photocatalyst has widely been used to photodegrade these organic pollutants for its proper bandwidth, relatively high catalytic reactivity, physical and chemical stability, avirulence and cheapness and so on.

TiO_2具有合适的禁带宽度，作为光催化剂具有化学性质稳定、价廉易得、无毒、催化效率高等优点，因而被广泛地用来处理各种废水。

Photonic quantum-well structures can be constructed by stacking 3 photonic crystals with the same photonic band gap and different defect modes. On condition that the defect mode of the PC in the well region is located into nontransmission frequency ranges of the PCs in the barrier regions, the confined photonic state appears and can completely transmit through the structure by tunneling. However, its transmission will be strongly prohibited due to vanishing of the photonic QW induced by shifting the defect mode frequency of either of the PCs in the surrounded regions to that of the middle PC.

把三块各带有一个缺陷的光子晶体结合起来，如果中央晶体的缺陷模处在两侧晶体的禁带中，缺陷模内的光波会受到两侧晶体的阻碍并被局域在中央晶体内，形成量子阱结构；若一侧晶体的缺陷模被移动到中央晶体缺陷模处，则只有一侧晶体阻碍在中央晶体缺陷模内传播的光波，量子阱效应完全消失，光的传输受到最大程度的阻碍。

Bismuth Oxyhalide Compounds, BiOX (X=Cl, Br, I) are new types of photocatalysts. They exhibit excellent photocatalytic properties due to layered crystal structure and suitable band gaps.

卤氧化铋，BiOX (X=Cl， Br， I)作为一种新型光催化剂，由于具有特殊的层状结构和合适的禁带宽度从而显示出优异的光催化性能。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。