共查询到19条相似文献,搜索用时 78 毫秒
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用传输矩阵方法和Bloch定理,从理论上分析以色散介质为背景,由正负折射率材料组成的半无限一维光子晶体的表面态,发现以色散介质为背景,在满足平均折射率等于零的情况下,第一层厚度变化时,表面态将会在较大频率范围内显著变化。讨论了同一入射角度下不同频率的表面态的电场分布情况,结果表明:远离带边的表面态局域长度较小。 相似文献
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通过传输矩阵方法,研究了含各向异性左手材料的一维光子晶体耦合微腔结构。结果表明,该结构中存在两类微带,一类位于常规的Bragg带隙,另一类位于零均值折射率带隙。当腔的厚度发生调制时,两类微带变成两类Wannier-Stark态。耦合微腔厚度梯度因子增大时,两类带隙中Bragg振荡周期都减小,而且透过率降低。 相似文献
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在1维光子晶体中引入色散负折射特异介质,分析了其介电常数和磁导率在微波区(1~10 GHz)与频率的关系。分别对以色散负折射介质为缺陷的正折射率介质光子晶体及以正折射率介质为缺陷的正负折射率介质光子晶体进行了数值仿真,得出了均匀平面电磁波在正入射和斜入射时的透射谱。结果表明:在介电常数和磁导率均为负值的不同禁带中,分别出现了单、双缺陷模。利用透射谱的这一特点,可实现单、双通道滤波。 相似文献
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The near-infrared (NIR) narrow filter properties in the transmission spectra of a one-dimensional photonic crystal doped with semiconductor metamaterial photonic quantum-well defect (PQW) were theoretically studied. The behavior of the defect mode as a function of the stack number of the PQW defect structure, the filling factor of semiconductor metamaterial layer, the polarization and the angle of incidence were investigated for Al-doped ZnO (AZO) and ZnO as the semiconductor metamaterial layer. It is found that the frequency of the defect mode can be tuned by variation of the period of the defect structure, polarization, incidence angle, and the filling factor of the semiconductor metamaterial layer. It is also shown that the number of the defect mode is independent of the period of the PQW defect structure and is in sharp contrast with the case where a common dielectric or metamaterial defect are used. The results also show that for both polarizations the defect mode is red-shifted as the number of the defect period and filling factor increase. An opposite trend is observed as the angle of incidence increases. The proposed structure could provide useful information for designing new types of tuneable narrowband filters at NIR region. 相似文献
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利用全矢量有限元法研究了一种混合导引型光子晶体光纤在纤芯折射率改变时,光纤导光机理和模式的演变特性.当纤芯折射率小于混合包层中空气孔包层的有效折射率时,芯模的导光机理为"双带隙导引型";当纤芯折射率位于空气孔和高折射率两套包层的有效折射率之间时,芯模的导光机理为"单带隙+全内反射导引型";当纤芯折射率大于高折射率棒包层的有效折射率时,芯模的导光机理为"全内反射导引型".并对该光纤在上述三种条件下的导光特性进行了比较和讨论.这些结果对设计特殊用途的光子晶体光纤具有指导意义.
关键词:
混合导引型光子晶体光纤
带隙
模式 相似文献
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Parametric analysis of the planar metamaterials based on complementary double-ring resonators 下载免费PDF全文
The planar metamaterials comprising complementary double-ring resonators(CDRRs) show its left handed behaviour.As a consequent work,this paper presents a detailed parametric study on the magnetically resonant transmission characteristics of the complementary double-ring metamaterials based on its structural parameters.This will be useful for the design of compact planar metamaterials based on the transmission lines loaded with CDRRs. 相似文献
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Macro composite right/left handedness (CRLH) signifies positive/negative refraction index in different frequency bands in the composite right/left handed transmission line (CRLH-TL). In this paper, the refraction index of a quantized CRLH-TL in the thermal squeezed state is visited. Performing explicit calculations on the squeezed parameters and electronic components' parameters, a novel regime for implementing CRLH with a single operating frequency via the squeezed parameters and electronic components' parameters is found. The definitely different monochromatic CRLH enriches the initial definition of CRLH, and may propose a novel direction to implement CRLH in metamaterials. 相似文献
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This paper proposes a tunable zeroth-order resonator on a composite right/left-handed transmission line consisting of a transversely magnetized ferrite substrate periodically loaded by microstrip inductors. Based on the propagation theory of edge guided modes, the analysis procedure of this structure is introduced. The numerical results demonstrate the tunability of the resonant frequency by changing the DC bias magnetic field applied to the ferrite. In contrast to previous work, the proposed structure is easy to design and fabricate and does not require a chip component. 相似文献