光子晶体的研究进展

光子晶体是一种新型功能材料，其最基本的特征是具有光子频率带隙，频率落在带隙内的电磁波被禁止在光子晶体中传播。文章介绍了光子晶体的基本性质和制备方法，以及结构无序对光子晶体带隙产生的影响，并对光子晶体的应用前景给予了简短的评述。     

光子晶体红外光谱特性调控及应用研究进展

光子晶体结构所具有的光子带隙和光子局域特性使得处在带隙内的电磁波无法传播,为实现目标红外隐身提供了重要手段。结合光子晶体的结构和工艺特性,总结了现有光子晶体红外光谱特性调控机理、调控设计方法和材料类型,包括周期结构优化、化合物材料、金属材料、等离子和超导材料等引入在光子晶体红外带隙调控方面的应用,并对光子晶体的未来发展进行了展望,以期对光子晶体在带隙调控和目标隐身等需求提供借鉴。     

准晶光子晶体特性及应用

准晶光子晶体具有产生完全带隙的折射率阈值低、光子带隙与入射方向无关、产生局域态无需缺陷等优于周期性光子晶体的性能,使其成为光子带隙材料和负折射率材料等的优秀候选对象,具有广阔的应用前景。对近年来准晶光子晶体的研究进展进行综述,主要包括准晶光子晶体的结构、特点以及在应用方面的研究进展和前景。     

光子带隙型光子晶体光纤研究与应用

带隙型光子晶体光纤(PBG-PCF)因其独特的性能,在各个领域都有着广泛的应用前景.文章阐述了带隙型光子晶体光纤的导光机制,并将带隙型光子晶体光纤分为空芯光子晶体光纤和全固态带隙型光子晶体光纤两类,较全面地讨论了这两类光纤的特性及其应用.     

光子带隙结构在微波方面的应用

20世纪80年代末出现的光子晶体是一种具有光子带隙的新材料,它独特的性质使得光子晶体具有广泛的应用前景。介绍了光子晶体的概念,综述了光子带隙结构在微波领域的应用和研究进展。     

光子晶体的研究进展

光子晶体是一种具有光子带隙的周期性电介质结构,落在光子带隙中的光不能传播.由于其独特的调节光子传播状态的功能,成为实现光通讯和光子计算机的基础.光子晶体的制备是发展光子晶体的关键,而可见光和近红外波段光子晶体的制备更是难点.本文阐述了光子晶体的概念及其特性后,分别介绍了光子晶体的实验研究和应用研究.实验研究重点介绍了光子晶体的制备方法.应用研究重点介绍了单模发光二极管光、光波导器件和微波天线等.     

光子晶体及其应用

光子晶体是一种具有光子带隙的新型功能材料,它独特的物理性质使得光子晶体具有 理论研究价值和广泛的应用前景。主要介绍了光子晶体的基本概念和三维光子晶体的制备技术,并综述了光子晶体的一些物理特性及其在光学、通信、微波方面的应用。     

光子晶体及其应用

光子晶体是一种具有光子带隙的新型功能材料,它独特的物理性质使得光子晶体具有理论研究价值和广泛的应用前景。主要介绍了光子晶体的基本概念和三维光子晶体的制备技术。并综述了光子晶体的一些物理特性及其在光学、通信、微波方面的应用。     

EBG在微波元件方面的应用

光子晶体是一种具有光子(电磁)带隙的新材料，它独特的物理性质使得光子晶体具有广泛的应用前景。介绍了光子晶体的概念，综述了电磁带隙结构在微波元件的应用和研究进展。     

二维复周期光子晶体的带隙结构

提出了由二维六边形结构和三角结构叠合构成的复周期光子晶体 ,利用平面波展开法计算了由空气中的介质圆柱棒组成的该复周期光子晶体的带结构。结果表明二维六边形结构和三角结构叠合构成的复周期结构的光子晶体可以形成很宽的TE波光子带隙 ,并且具有较宽的TE波和TM波带隙重叠的绝对光子带隙     

一类慢变周期结构光子晶体的能带特性研究

本文改造了一种周期厚度保持不变，但相邻周期内部高低折射率区的厚度发生缓慢变化的变周期结构的光子晶体，并对其光子能带特性进行了分析。研究发现，本文所提出的两端带有慢变结构的光子晶体能够有效地拓宽光子能带带隙，与均匀结构相比，拓宽率可以达到200%以上。     

Photoinduced Tuning of Optical Stop Bands in Azopolymer Based Inverse Opal Photonic Crystals

Photo‐tunable photonic crystals were prepared from three dimensional (3D) colloidal crystal templates using a photoresponsive azopolymer. For the preparation of azopolymer infiltrated photonic crystals, silica colloidal crystals were fabricated by gravity sedimentation, a self‐assembly technique. The interstitial voids between colloidal particles were filled with azopolymer and azopolymer inverse opals were produced by treatment with aqueous hydrofluoric acid. These photonic crystals exhibited stop bands in their transmission spectra measured in the normal incidence to the (111) plane of face centered cubic (fcc). The photonic bandgap of the azopolymer infiltrated opal and inverse opal could be controlled by the refractive index change due to the photoinduced orientation of azobenzene chromophores. When the azopolymer photonic crystals were irradiated with linearly polarized light, their bandgap positions were shifted to shorter wavelength regions with increasing irradiation time. This behavior experimentally produced a photoinduced orientation of the azobenzene groups in parallel with the incidence of the excitation light. Through such an out‐of‐plane orientation of azo chromophores, parallel to the [111] fcc crystallographic axis, the effective refractive index of the photonic crystal medium was decreased. Therefore, a blue‐shift in bandgap positions was consequently induced with 20–40 nm tuning ranges. The out‐of‐plane orientation was confirmed by angular resolved absorption spectral measurements.     

Double‐Inverse‐Opal Photonic Crystals: The Route to Photonic Bandgap Switching

Photonic crystals with a complete bandgap can stop the propagation of light of a certain frequency in all directions. We introduce double‐inverse‐opal photonic crystals (DIOPCs) as a new kind of optical switch. In the DIOPC, a movable, weakly scattering sphere is embedded within each pore of the inverse‐opal photonic crystal lattice. Switching between a diffusive reflector and a photonic crystal environment is experimentally demonstrated. Theory shows that a complete bandgap can be realized that can be opened or closed by moving the spheres. This functionality opens up new possibilities for the control of light emission and propagation. The close link and interaction between the chemical synthesis and the computational design and analysis underlines the interdisciplinary focus of this report.     

Engineered Light Scattering in Colloidal Photonic Heterocrystals

Photonic heterocrystals are prepared by sandwiching films of self‐assembled opal and force‐assembled Langmuir–Blodgett colloidal crystals. Anomalously strong light scattering in conjunction with low reflectivity is observed with increasing angle of incidence in the spectral range of photonic bandgaps. The occurrence of light scattering at the interface has been assigned to the optical mode mismatch between the two types of photonic crystals. Photonic bandgap‐related mechanisms of trapping the decaying photonic crystal modes at the interface are suggested.     

Air‐Pulse‐Drive Fabrication of Photonic Crystal Films of Colloids with High Spectral Quality

A fast and highly controllable method of fabricating large films of photonic crystals of colloids is reported. A charge‐stabilized colloidal suspension was run in a flat capillary driven by a pressure‐regulated air pulse. The colloidal crystal texture formed in the capillary was a sensitive function of air pressure. Above a critical pressure, the entire capillary was filled with a uniform single‐domain texture whose transmittance spectrum showed a high quality as a photonic crystal, i.e., excellent opacity at a photonic bandgap and high transparency at other wavelengths. The present method is easily applicable to industrial processes for mass production.     

正方晶格光子晶体第一带隙特性研究

由于光子晶体的禁带特性具有重要的应用,基于电磁波传输理论,应用MATLAB数值仿真二维正方晶格光子晶体TE模第一带隙特性,数值计算了介电常数变化、填充率变化对第一带隙宽度及形成带隙个数的影响,结果得到随着介电常数的增加第一带隙宽度增加,随着填充率的增加,第一带隙宽度逐渐减小。研究结论为光子晶体器件的制作提供参考。     

Extending transmission bandwidth of air-core photonic bandgap fibers

Air-core photonic bandgap fibers offer many unique properties and are critical to many emerging applications. A notable property is the high nonlinear threshold which provides a foundation for applications at high peak powers. The strong interaction of light and air is also essential for a number of emerging applications, especially those based on nonlinear interactions and spectroscopy. For many of those applications, much wider transmission bandwidths are desired to accommodate a wider tuning range or the large number of optical wavelengths involved. Presently, air-core photonic bandgap fibers have a cladding of hexagonal lattice. The densely packed geometry of hexagonal stacking does not allow large nodes in the cladding, which would provide a further increase of photonic bandgaps. On the other hand, a photonic cladding with a square lattice can potentially provide much larger nodes and consequently wider bandgap. In this work, the potentials of much wider bandgap with square lattice cladding is theoretically studied and experimentally demonstrated.     

FDTD方法分析光子带隙微带结构

本文采用时域有限差分法分析计算了一维光子带隙微带结构的S参数,并设计制作了光子带隙（PBG）微带线,进行了测量。将计算结果与测量结果对比可以看出两者吻合得比较好,说明采用的分析方法是有效的。