共查询到19条相似文献,搜索用时 140 毫秒
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利用传输矩阵法研究了含特异材料的一维超导光子晶体的带隙特性. 研究表明, 这类超导光子晶体同样具有由传统的电介质材料构成的超导光子晶体一样的低频带隙, 且在一定的参数下该低频带隙可以相当宽. 但在一定的结构参数下, 这类超导光子晶体同完全由传统的电介质构成的光子晶体一样不存在低频带隙. 还就超导光子晶体的偏振特性、光子晶体结构参数及环境温度的变化对光子带隙结构的影响进行了研究.
关键词:
超导光子晶体
传输矩阵法
特异材料
光子带隙 相似文献
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利用传输矩阵法研究了正负折射率材料构成的异质结构光子晶体的光学传输特性。结果表明:当入射波正入射时,在这种异质结构光子晶体内出现了光子带隙,并且带隙内出现了3个极窄的透射峰,这是正负交替光子晶体和常规材料构成的同周期一维异质结构光子晶体所不具有的新颖物理特性。计算了这种异质结构光子晶体的透射谱。发现:这3个透射峰不敏感于入射角的变化,而在带隙两侧的透射峰则会随着入射角增大统一向带隙靠近;能带敏感于晶格厚度和周期数的变化。 相似文献
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利用光学传输矩阵方法,模拟计算了由铁磁材料组成的一维光子晶体的光学传输特性.研究了能带结构随介质层厚度h(O ≤h≤0.5λ0 λ0=1.2×10-6m)变化的规律,并与相同周期结构的普通光子晶体的传输特性进行了比较.结果表明,当O.15λ0<h<0.165λ0时,铁磁光子晶体的带隙宽度略小于普通光子晶体的带隙宽度;在h取其他值时铁磁光子晶体的带隙宽度远远大于普通光子晶体的带隙宽度,并且在h=0.25λ0时存在最大值.这种结构的光子晶体通过掺杂有望在多通窄带滤波技术中得到广泛的应用. 相似文献
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基于传输矩阵法研究了一维压电Fibonacci类准周期声子晶体的传输特性, 比较了一维Fibonacci序列压电准周期声子晶体与非压电准周期声子晶体以及压电周期性声子晶体的透射性. 计算结果表明:弹性波通过一维准周期结构压电声子晶体时与周期性声子晶体一样会有带隙的出现, 且发现具有压电性的Fibonacci序列准周期声子晶体禁带宽度发生了展宽. 进一步讨论了入射角度对固定频率下声子透射系数的影响,结果表明一维压电Fibonacci序列准周期结构声子透射性依赖于入射角度的选取. 相似文献
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构造了(AB)N(BA)N对称型两种单负材料交替一维光子晶体,利用传输矩阵法进行数值模拟.结果表明:这种单负交替对称型一维光子晶体具有一种特殊带隙结构,该带隙不敏感于入射角和晶格的无序性.在该带隙内出现了两个隧穿模,该隧穿模不敏感于入射角的改变和晶格的无序性,但能带及带隙内的隧穿模却敏感于晶格标度和周期数的变化;随着入射角的改变,带隙两侧的隧穿模趋于简并.这些特性对在利用此结构光子晶体设计双重超窄带滤波器时,具有一定的参考价值.
关键词:
光子晶体
单负材料
光子带隙 相似文献
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应用复平面波展开法对一维光子晶体的光子带隙, 透射特性进行了分析. 通过对色散关系和透射系数的数值计算发现一维光子晶体周期结构个数以及折射率分布对光学晶体透射系数以及光子带隙的影响. 对于含有整数个周期结构的光子晶体有共振点出现在光子帯隙外的频率范围内, 共振点的个数比周期结构个数少1. 带隙倾斜斜率等于折射率的比值. 折射率比值越大, 带隙的范围越大. 相似文献
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Zhong Yin Xiao Zi Hua Wang 《International Journal of Infrared and Millimeter Waves》2006,27(3):443-454
In this paper, the reflection and transmission coefficients of multi-layer dielectric and metamaterial media are derived by
transmission-line method. Then, it is applied to double periodic photonic crystal structure, which is composed of two thin
dielectric layers sandwiched by two thin metamaterial layers. The results show the structure has a large passband and a monotonous
symmetric rising band edges compared with that for a conventional photonic crystal structure. If a defect layer is introduced,
the localized modes appear. Furthermore, the number of transmission peaks in the photonic crystal structure can be tuned by
changing the thickness of the defect in the structure. This photonic crystal may find application to broadband reflectors
and the multi-wavelength narrow band optical filters. 相似文献
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Dispersion characteristics of two-dimensional unmagnetized dielectric plasma photonic crystal 总被引:1,自引:0,他引:1 下载免费PDF全文
This paper studies dispersion characteristics of the
transverse magnetic (TM) mode for two-dimensional unmagnetized
dielectric plasma photonic crystal by a modified plane wave method.
First, the cutoff behaviour is made clear by using the
Maxwell--Garnett effective medium theory, and the influences of
dielectric filling factor and dielectric constant on effective
plasma frequency are analysed. Moreover, the occurence of large gaps in
dielectric plasma photonic crystal is demonstrated by comparing the
skin depth with the lattice constant, and the influence of plasma
frequency on the first three gaps is also studied. Finally, by using
the particle-in-cell simulation method, a transmission curve in the
\Gamma -X direction is obtained in dielectric plasma photonic
crystal, which is in accordance with the dispersion curves
calculated by the modified plane wave method, and the large gap between
the transmission points of 27~GHz and 47~GHz is explained by
comparing the electric field patterns in particle-in-cell
simulation. 相似文献
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We report beaming and enhanced transmission of electromagnetic waves by use of surface corrugated photonic crystals. The modes of a finite-size photonic crystal composed of dielectric rods in free space have been analyzed by the plane-wave expansion method. We show the existence of surface propagating modes when the surface of the finite-size photonic crystal is corrugated. We theoretically and experimentally demonstrate that the transmission through photonic crystal waveguides can be substantially increased by the existence of surface propagating modes at the input surface. In addition, the power emitted from the photonic crystal waveguide is confined to a narrow angular region when an appropriate surface corrugation is added to the output surface of the photonic crystal. 相似文献
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用传输矩阵法计算了两端对称缺陷复合光子晶体结构的光传输特性。计算结果表明:两端对称缺陷复合光子晶体[D(AB)mD]2结构中的禁带出现两个完全共振透射峰。通过控制入射光强来微调光子晶体材料的介电常数,使得完全共振透射峰移动,且介电常数变化越大,共振透射峰偏移越大,从而形成高效率的双通道光开关。当光子晶体为[D(AB)mD]N结构时,每个完全共振透射峰都分裂为N-1条,这样可通过调节N同时实现所需要通道数目的高效多通道光开关和多通道滤波器。 相似文献
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提出并优化了用于二维介质柱光子晶体波导与单模平面介质波导对接的基于分布布拉格反射波导的喇叭波导接头,提高了这两种波导之间的传输效率.二维时域有限差分仿真结果表明,在大部分光子晶体波导导模的频谱范围内,传输效率高于98%.传输效率最高可以达到99.85%.
关键词:
光子晶体波导
平面介质波导
时域有限差分 相似文献
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利用传输矩阵法研究了实介电常量和含复介电常量时一维光子晶体的透射谱.结果表明:两种情况下均构成光量子阱结构,并且光量子阱结构的透射能带谱位置和结构相同,但在含复介电常量负虚部情况下共振透射峰出现很强的增益现象,而在含复介电常量正虚部情况下共振透射峰则呈现明显的衰减现象. 相似文献
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The transmission spectra of two-dimensional resonant photonic crystals of two types have been investigated. Crystals of one
type consist of dielectric cylinders forming a square lattice filled by a resonant gas with mercury atoms, and crystals of
the other type consist of cylindrical holes filled with a gas and forming a square lattice in a dielectric matrix. It has
been established that characteristics of the spectrum of additional transmission arising in the band gap of the photonic crystal
can be changed significantly by varying the gas pressure and the angle of incidence. It has been demonstrated that the calculated
features in the transmission spectrum of the photonic crystal are stable with respect to a significant increase in the width
of the atomic resonance. 相似文献
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In this paper, the principal and characteristics of one-dimensional photonic crystal are introduced, its transmission matrix is derived; and its light transmission characteristics are also analyzed through numerical calculation by means of transfer matrix method, including impacts of dielectric layer thickness, permittivity, and dielectric periodicity, etc. on light transmission characteristics of 1-D photonic crystals. 相似文献