共查询到18条相似文献,搜索用时 140 毫秒
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光子晶体是由具有不同介电常数的物质,在空间按照周期性排列形成具有光子带隙的介电结构材料.光子带隙中的慢光子和带隙反射可以促进光子的捕获和控制光与物质之间的相互作用.基于光子晶体独特的光学特性和较大的比表面积,将光子晶体结构引入到半导体光催化材料的设计中,可以有效地增强光催化反应活性.本文介绍了三维光子晶体的制备方法及慢光子效应,总结了光子晶体特别是反蛋白石结构的光子晶体作为光催化剂在废水净化、制氢、二氧化碳的转化等领域的研究进展,并针对光子晶体光催化剂面临的挑战,提出了开发具有不同折射率和周期性的多层三维光子晶体,促进光子晶体在光催化领域的应用. 相似文献
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研究了含负折射率材料的一维光子晶体中一种特殊的带隙,这种带隙最适合的用途是做新型光子晶体滤波器. 相似文献
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The effect of temperature on a two-dimensional square lattice photonic crystal composed of Si rods arranged in an air background was investigated theoretically using the plane-wave expansion method. Both the thermal expansion effect and thermo-optical effect are considered simultaneously. We have discussed the role of temperature in creating the complete photonic band gap as a function of temperature. Two different shapes of rods, i.e. square and circular, are considered in the presence of the two polarization states, i.e. TE and TM waves. The numerical results show that the photonic band gap can be significantly enlarged compared to the photonic band gap at room temperature. The effect of temperature on the complete photonic band width in the cylindrical rods case is more significant. Cylindrical and square Si rods may work as a temperature sensor or filter, among many other potential applications. 相似文献
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光子晶体是一种具有光子带隙的新型材料,其概念提出比较早,距今已经过了30年。由于光子晶体具有很多新颖的特性,使其成为微纳光子学和量子光学的重要研究领域。随着微加工技术的进步和理论的深入研究,光子晶体在信息光学以及多功能传感器等其他多个学科中也得到广泛应用。本文从理论上详细综述了光子晶体的各种奇异特性,并从各种特性出发,详细介绍近年来光子晶体在光子晶体光纤、反射镜、滤波器、波导、低阈值激光器、多功能传感器、腔量子电动力学、偏振器、量子信息处理等领域的应用研究,并与传统的器件进行性能比较得出光子晶体器件具有无可比拟的优势。最后提出,随着3D打印制造技术的成熟,光子晶体材料必然会推动信息技术的新一轮革命。 相似文献
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三维光子晶体及其制备技术研究进展 总被引:2,自引:0,他引:2
光子晶体是一种新概念人工结构功能材料,通过设计可以人为调控经典波的传榆.而三维光子晶体能产生全方向的完全禁带,具有更普遍的实用性.从结构、材料及应用探索3方面介绍了近几年来光学波段三维光子晶体的最新发展动向:以器件化为指导,逐步由简单媒质简单周期向复杂媒质复合周期结构方向发展,由胶体模板自组装等纯化学制备手段向物理化学方法相融合的多元技术扩展,其应用领域也由光电子器件、集成光路进一步拓展到光电对抗、光学探测、传感等. 相似文献
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AbstractIn this study, we analyse the evolution of complete photonic band gap in two-dimensional photonic structures by arranging the 12-fold symmetric quasicrystalline unit cells on square and triangular lattices. The unit cells composed of circular air holes in anisotropic tellurium background and the air holes are infiltrated with liquid crystal. Using the supercell method based on plane wave expansion, we study the variation of complete band gap by changing the optical axis orientation of liquid crystals. 相似文献
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A binary genetic algorithm with floating crossover and mutation probabilities is used to design two-dimensional photonic crystals for large absolute band gaps under a light line. The unit cell is composed of a small number of round rods and is arranged in a square lattice. The photonic band structure of each chromosome is calculated by the plane-wave expansion method. Starting from randomly generated photonic crystals, the genetic algorithm finally yielded a photonic crystal with an absolute common band gap of 0.0618(2πc/a) at the mid-frequency of 0.4084(2πc/a). 相似文献
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Photonic crystal heterostructures constituting of two photonic crystals with different lattice constants are fabricated using the modified self-assembly method and their structural and optical properties are investigated. The results show that these photonic crystal heterostructures of high quality possess deep photonic band gaps and steep photonic band edges in their transmission spectra. Deep double photonic band gaps, steep photonic band edges and high transmittance in the pass band show good ordering of the heterostructure and may offer a probability for studying late-model ultra-fast all-optical switches. 相似文献