共查询到20条相似文献,搜索用时 15 毫秒
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Jintai Ding 《Letters in Mathematical Physics》1996,38(2):177-183
We define the crystal algebra, an algebra which has a base of elements of crystal bases of a quantum group. The multiplication is defined by the tensor product rule of crystal bases. A universal n-colored crystal algebra is defined. We study the relation between those algebras and the tensor algebras of the crystal algebra of U
q
(sl(2)) and give a presentation by generators and relations for the case of U
q
(sl(n)). 相似文献
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液晶填充碲酸盐光子晶体光纤偏振旋转器 总被引:1,自引:0,他引:1
提出一种液晶填充碲酸盐玻璃的柚子型光子晶体光纤偏振旋转器,利用全矢量有限元法,对液晶填充碲酸盐玻璃的柚子型光子晶体光纤的偏振旋转特性进行数值模拟,并分析了光纤结构参数、环境温度、工作波长等对光纤偏振旋转特性的影响.研究结果表明:此种偏振旋转器具有较高的旋转效率、较低的工作串扰和较短的旋转长度,在工作波长为1.55μm、偏振角度为45°时,其值分别达到99.947%、-32.84dB和197μm;另外,随着光纤薄壁厚度的增加,旋转长度随之升高,随着工作波长的变大,旋转长度随之降低,随着温度的增加,旋转长度随之升高.这种新型的光子晶体光纤为偏振旋转器的研发提供了参考. 相似文献
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Er3+/Yb3+:KG(WO4)2的熔盐提拉法生长及光谱性能 总被引:2,自引:0,他引:2
采用熔盐提拉法生长了尺寸达30 mm×25 mm×15 mm的Er3+/yb3+KGd(WO4)2透明晶体,从中切出5 mm×5 mm×3mm大小的激光器件,在室温下测试了吸收光谱,可以观察到晶体存在366,380,489,522,651,811,980 nm等吸收峰,并对之进行了能级归属.同时在980 nm激光激发下测试了荧光光谱,可以发现在1 024,1 535 nm处存在较宽的强发射峰,其半高宽分别为60和36 nm.研究结果表明,Er3+/yb3+KG(WO4)2适合于InGaAs LD(980 nm)泵浦,有可能产生1 024 nm波段及人眼安全的1 535 nm波段的可调谐激光. 相似文献
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一维金属/介质光子晶体用于BaF2晶体闪烁光谱修饰 总被引:14,自引:6,他引:8
利用一维金属/介质光子晶体对BaF2晶体闪烁光谱进行修饰. 以Al2O3/MgF2/Al/ MgF2为周期构成光子晶体,讨论了周期数、金属层的厚度以及在低折射率层中的相对位置、入射角度等与光子晶体能带特性的关系及其对BaF2晶体闪烁光谱进行修饰的效果. 结果表明,在所考虑的发射角范围,光子晶体对快成分的衰减小于5倍,对慢成分的相对抑制比超过20倍,采用合适的探测角度,可使对慢成分的相对抑制比提高到100以上. 相似文献
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A photonic crystal fiber has been filled with a cholesteric liquid crystal. A temperature sensitive photonic band gap effect was observed, which was especially pronounced around the liquid crystal phase transition temperature. 相似文献
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理论分析了液晶调谐滤波器的调谐原理,利用岛津UV-23101分光光度计,通过对BL-009型向列相液晶透射比的测试,分析了可见光波段液晶透射比随电场的变化情况,作出了入射光波长从400~800 nm时液晶透射比随电压变化的关系曲线,并就氩离子激光器两条谱线488 nm和514.5 nm进行了提取. 相似文献
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Theq-deformed vertex operators of Frenkel and Reshetikhin are studied in the framework of Kashiwara's crystal base theory. It is shown that the vertex operators preserve the crystal structure, and are naturally labeled by the global crystal base. As an application the one point functions are calculated for the associated elliptic RSOS models, following the scheme of Kang et al. developed for the trigonometric vertex models.Dedicated to Huzihiro Araki 相似文献
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We propose using a slotted photonic crystal nanobeam to construct a microring resonator. The transmission characteristics of the slotted photonic crystal nanobeam and the microring resonator are demonstrated by two-dimensional finite-difference time-domain simulation, and the mechanism of these characteristics is analyzed considering the introduction of the slot. The refractive index sensitivity of the slotted photonic crystal microring resonator is evaluated to be larger than those of a slot waveguide microring resonator and a nonslotted photonic crystal microring resonator. 相似文献
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V. Sh. Machavariani 《Russian Physics Journal》1995,38(7):757-760
In this paper, the effect of crystal anisotropy on absorption of x-radiation is investigated. A formula is obtained describing the absorption of x-radiation by a biaxial crystal. Crystal optic effects are considered in the x-ray region of the spectrum. A mechanism is proposed for the dependence of the fine structure of x-ray absorption on the sample thickness in an anisotropic crystal. The effect of the crystal anisotropy on the x-ray fluorescence is investigated in the case of a uniaxial crystal.Scientific-Research Institute of Physics, Rostov State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 115–119, July, 1995. 相似文献
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Transformation fieM method (TFM) is developed to estimate the anisotropic dielectric properties of crystal composites having arbitrary shapes and dielectric properties of crystal inclusions, whose principal dielectric axis are different from those of anisotropic crystal matrix. The complicated boundary-value problem caused by inclusion shapes is circumvented by introducing a transformation electric field into the crystal composites regions, and the effective anisotropic dielectric responses are formulated in terms of the transformation field. Furthermore, the numerical results show that the effective anisotropie dielectric responses of crystal composites periodically vary as a function of the rotating angle between the principal dielectric axes of inclusion and matrix crystal materials. It is found that at larger inclusion volume fraction the inclusion shapes induce profound effect on the effective anisotropic dielectric responses. 相似文献
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通过平面波展开法对由Al2O3介质棒在空气背景介质中构成含有点缺陷的二维正方光子晶体微腔结构进行研究,计算得出缺陷态能带以及缺陷态模场分布。缺陷模对应的电磁波波长为470~476nm。对该微腔结构的品质因数的求解,得出缺陷态光谱曲线。在光谱曲线中,随着传输波长的增大,将产生几个峰值,并且在475nm处的波动最为明显,反映出在475nm附近的电磁波段在缺陷处的光强较大。进一步利用全矢量等效折射率法研究该结构缺陷模频率的稳定性,得出等效折射率的变化曲线。从等效折射率变化曲线可以看出,当传输波长达到475nm时,该结构已经达到稳定传输的区域。含缺陷模的二维光子晶体微腔结构在光子晶体发光二极管以及高阈值半导体激光器等方面有着重要的应用价值。 相似文献
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运用时域有限差分法数值模拟了蜂巢晶格光子晶体能带特性,得到了蜂巢晶格光子晶体的最大横电(TE)模、横磁(TM)模和完全带隙,研究结果为光子晶体器件的开发提供了理论依据. 相似文献
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一维光子晶体色散特性的研究 总被引:1,自引:1,他引:0
应用传输矩阵法研究一维光子晶体的色散特性,数值模拟得到了一维光子晶体横电(TE)模、横磁(TM)模的色散特性,研究结果为一维光子晶体器件的设计提供了理论依据. 相似文献