共查询到19条相似文献,搜索用时 156 毫秒
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利用传输矩阵方法,从理论上研究了金属插层对由SiSiO2组成的一维光子晶体中光传输特性的影响.结果表明:由(SiSiO2)n组成的一维光子晶体,考虑到材料的实际吸收及折射率随波长发生变化的情况,当n≥9时,该体系出现全反射带(光子带隙),在(SiSiO2)n光子晶体中的SiO2层的中间插入金属银层,构成(SiSiO2AgSiO2)n金属型一维光子晶体,光子带隙的宽度明显加宽,且在该带隙中s光和p光在0—60°入射角下均具有较低损耗,利用这一特性,可以制作出宽带反射镜
关键词:
光子晶体
金属层
传输矩阵 相似文献
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基于平面波展开法,以介电常数分别为1F/m和13.18F/m的物质构成三角晶格二维光子晶体,改变空气孔半径r与晶格常数a之间的大小,数值模拟得到了三角晶格二维光子晶体横磁模带隙,当r=0.4a时形成3处三角晶格二维光子晶体横电模的带隙,其中最大三角晶格二维光子晶体横电模带隙出现在0.2424-0.4129Hz,差值为0.1705Hz.相比r=0.4a横磁模形成的最大带隙0.1057Hz较大.研究结论为光子晶体器件的制作提供参考. 相似文献
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本文研究制备一种由低折射率的SiOx层与高折射率的a-Si层周期性交叠构成的新型一维光子晶体(1D PC)背反射器.研究结果表明,随着SiOx/a-Si交叠周期数的增加,一维光子晶体的反射率逐步提高.当周期数大于3时,在空气中500—750 nm波长范围的平均反射率达到96%.将该一维光子晶体作为背反射器应用于NIP型非晶硅电池(电池结构为玻璃/1D PC/AZO/NIP a-Si:H/ITO),当光子晶体周期为4时,效率达到7.9%,略优于传统的AZO/Ag背反射电极结构电池(7.7%),明显高于不锈钢衬底电池(6.9%),相对效率提升14.5%. 相似文献
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《Current Applied Physics》2009,9(1):18-21
We study the effect of metallic cladding on the band structure of a two-dimensional photonic crystal slab. Band structures of a honeycomb patterned two-dimensional photonic crystal slab, with/without a metal-clad or a perfect conductor clad, are calculated using both the finite-difference time-domain (FDTD) method and the plane wave expansion (PWE) method. We explain the changes of the band structure due to cladding. We also show that the band structure of a metal-clad photonic crystal can be obtained effectively from the odd modes of the air bridge type dielectric photonic crystal slab, thicker than the metal-clad photonic crystal by a factor larger than two. 相似文献
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Xu Bingshe Han Peide Liu Xuguang Li Tianbao Hideki Ichinose 《Solid State Communications》2005,133(6):353-356
Theoretical calculations via a transfer matrix method (TMM) were performed to investigate the possibility of fullerene/AlN multilayer films acting as one-dimensional (1D) photonic band gap (PBG) crystals. The response within and out of the periodic plane of (C60, C70)/AlN multilayers was studied. (C60, C70)/AlN multilayer films presented incomplete PBG behavior in UV region. C60/AlN multilayers with two pairs of 49 nm-C60 and 21 nm-AlN layers exhibited a high reflectivity of 90.4% at a wavelength of about 200 nm. As a consequence, this photonic crystal may be important for achieving materials with an incomplete band gap in the UV region. 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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Optical properties of a periodic one-dimensional semiconductor-organic photonic crystal in UV region
Suihu Dang 《Optical Review》2008,15(5):255-258
Optical properties of a one-dimensional semiconductor-organic photonic crystal with periodic AlN/3-octylthiophenes (P3OT)
multilayer structure are exhibited and confirmed by a calculation of the transfer matrix method (TMM). An AlN/P3OT multilayer
structure displays incomplete photonic band gap behavior in the UV region. The AlN/P3OT multilayers with four pairs of 35-nm-AlN
and 35-nm-P3OT layers exhibit a high reflectivity of 89% and less absorption of 10% at a wavelength of about 300 nm. These
results demonstrate the AlN/P3OT multilayer structure could be a good candidate for absolute inhibition of reflection in the
ultraviolet region for a given orientation. 相似文献
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利用传输矩阵方法,研究了一维电介质-金属光子晶体的光学特性,该光子晶体通过在Si/SiO2组成的电介质型光子晶体中插入一定厚度Al层形成。计算结果表明,金属层的引入可以有效提高反射效率,[Si(46 nm)/SiO2(60 nm)/Al(10 nm)/SiO2(60 nm)]5结构的单位周期传输衰减从[Si(46 nm)/SiO2(120 nm)]5的7.2 dB增大到了20 dB;可以得到更宽频率范围的全方向反射带隙,例如[Si(46 nm)/SiO2(60 nm)/Al(30 nm)/SiO2(60 nm)]5结构即可提供550 nm带宽的全方向反射;同时讨论了金属吸收、金属层厚度及插入位置对其光学特性的影响。这种电介质-金属光子晶体有望作为性能优异的光学反射镜得到应用。 相似文献
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Anirudh Banerjee 《International Journal of Infrared and Millimeter Waves》2008,29(11):1070-1082
A theory to design narrow band optical filters by using a new photonic crystal structure is presented. This new photonic crystal
structure is composed of low index layers and high index layers arranged in mod. 4 up and down binary number sequence. The
new structure exhibits narrow transmission peaks in the forbidden frequency gap region with high optical transmission (greater
than 99.98%) at C.W.D.M. (Coarse Wavelength Division Multiplexing) center wavelengths. The proposed filters use only 8 layers.
These new binary number sequence photonic crystal narrowband optical filters are much smaller in size, lower in cost and easier
to fabricate as compared to narrowband photonic crystal optical filters based on defect Fractal Cantor multilayers, suggested
recently by a group of researchers. 相似文献
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一维光子晶体禁带的展宽 总被引:13,自引:6,他引:7
作为一维光子晶体的应用基础,一维光子晶体的禁带是研究的重点。通过传输矩阵的方法分析了一维光子晶体禁带的特性,讨论了影响带宽的因素。说明了相对带宽对光子晶体设计的重要性。在这个基础上讨论了扩展一维光子晶体带宽的方法,提出了在角域范围内对光子晶体进行叠加的方法,为设计制造一维光子晶体提供了一种行之有效的方法。分别对2个、3个和4个晶体的叠加进行了分析,最后计算了所设计的合成晶体的反射率。其中4个晶体的叠加,相对带宽达到57.52%,极大地展宽了一维光子晶体的禁带,从而证明利用角域的叠加来展宽一维光子晶体的禁带是非常有效的。 相似文献
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Jianbiao Zhang Xiaoshuang Chen Weida Hu Jun Shao Wei Lu Zhenlin Wang 《Solid State Communications》2008,145(11-12):582-584
A metallodielectric photonic crystal with photonic band gaps in near infrared regime has been constructed using layer-by-layer stacking of two-dimensional micro-size metal-coated dielectric spheres array. In transmission spectra two photonic band gaps are observed at 1.38 μm and 2.46 μm, which are in agreement with theoretical calculations. Experimental results show that the photonic band gaps can be realized with about ten layers. The structure with metallic microspheres provides us a novel way for fabrication of near infrared metallic photonic crystals. 相似文献