共查询到18条相似文献,搜索用时 62 毫秒
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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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采用磁化等离子体的分段线性电流密度卷积时域有限差分(PLCDRC-FDTD)算法研究具有单一缺陷层的一维磁化等离子体光子晶体的缺陷模特性. 从频域角度分析得到微分高斯脉冲的透射率,并讨论该光子晶体的缺陷层厚度、位置、周期常数和等离子体参数对其缺陷模的影响. 结果表明,改变位置和周期常数不会影响缺陷模的频率,改变缺陷层的厚度可以增加缺陷模数,改变等离子体参数能同时影响缺陷模的频率和峰值.
关键词:
磁化等离子体光子晶体
光子晶体
缺陷模
时域有限差分法 相似文献
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含负折射率缺陷的一维光子晶体的杂质带 总被引:1,自引:1,他引:0
利用传输矩阵方法研究了含负折射率缺陷的一维光子晶体的透射谱.以19个周期的1/4波堆存在3个负折射率缺陷的光子晶体为例进行了数值计算.结果表明:如果改变缺陷的折射率,缺陷模之间的耦合作用将发生改变,带隙中形成的杂质带也随之改变; 当这个折射率取适当值时,在禁带中出现多个尖锐的透射峰,与正折射率缺陷构成的杂质带不同. 相似文献
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利用传输矩阵方法研究了含负折射率缺陷的一维光子晶体的透射谱.以19个周期的1/4波堆存在3个负折射率缺陷的光子晶体为例进行了数值计算.结果表明:如果改变缺陷的折射率,缺陷模之间的耦合作用将发生改变,带隙中形成的杂质带也随之改变; 当这个折射率取适当值时,在禁带中出现多个尖锐的透射峰,与正折射率缺陷构成的杂质带不同. 相似文献
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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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Band rules for the frequency spectra of three kinds of aperiodic photonic crystals with negative refractive index materials 下载免费PDF全文
By means of the theory of electromagnetic wave propagation
and transfer matrix method, this paper investigates the band rules
for the frequency spectra of three kinds of one-dimensional (1D)
aperiodic photonic crystals (PCs), generalized Fibonacci GF(p,1),
GF(1,2), and Thue--Morse (TM) PCs, with negative refractive index
(NRI) materials. It is found that all of these PCs can open a broad
zero-? gap, TM PC possesses the largest zero-? gap,
and with the increase of p, the width of the zero-? gap for
GF(p,1) PC becomes smaller. This characteristic is caused by the
symmetry of the system and the open position of the zero-?
gap. It is found that for GF(p,1) PCs, the possible limit
zero-? gaps open at lower frequencies with the increase of
p, but for GF(1,2) and TM PCs, their limit zero-? gaps
open at the same frequency. Additionally, for the three
bottom-bands, we find the interesting perfect self-similarities of
the evolution structures with the increase of generation, and obtain
the corresponding subband-number formulae. Based on 11 types of
evolving manners Qi(i=1,2,....,11) one can plot out the
detailed evolution structures of the three kinds of aperiodic PCs
for any generation. 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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结合表面缺陷半无限光子晶体Tamm态与多孔硅光学传感机理,在光子晶体表面缺陷腔中引入多孔硅,并利用其高效的承载机制,提出基于多孔硅表面缺陷光子晶体Tamm态的折射率传感结构.在半无限光子晶体中缺陷腔与原来的周期性分层介质结构的界面上存在Tamm态,通过入射角度调制使其在缺陷腔中实现多次全反射,并在缺陷腔中加入吸收介质,使谐振波长在缺陷腔中完成衰荡,从而在反射谱中得到缺陷峰;调整光子晶体参数,使缺陷峰的半高全宽得到优化,提高其品质因数(Q值);在此基础上,根据Goos-H?nchen相位移与谐振波长的关系,建立由待测样本折射率改变所导致的多孔硅表面吸附层有效折射率变化与缺陷峰值波长漂移之间的关系模型,并分析其折射率传感特性.结果表明,此生物传感结构Q值为1429,灵敏度为546.67 nm/RIU,证明了该传感结构的有效性,可为高Q值和高灵敏度折射率传感器的设计提供一定的理论参考. 相似文献