TiO2/ SiO2一维光子晶体的制备及其光子带隙特性

以普通载玻片为基体,采用溶胶-凝胶法制备了TiO2/SiO2一维光子晶体,对该结构的截面形貌、各层厚度及结晶形态、反射谱特性进行了分析。结果表明:TiO2和SiO2膜的平均厚度分别为69 nm和83 nm,结晶形态分别为锐钛矿和无定形态;该结构在波长544 nm处的反射率达到了94%,且其FWHM=194 nm(486~680 nm)。运用传输矩阵法对该结构进行仿真计算,得到的计算结果与测试结果趋于一致。最后讨论了入射角对一维光子晶体反射谱的影响。     

光子晶体的可控垂直沉积

使用等温蒸发工艺开发了光子晶体的可控垂直沉积(CVD)技术,初步探索了光子晶体的结晶机制.使用可控垂直沉积技术将294 nm和345 nm的PMMA微球组生长成光子晶体.试样的扫描电镜研究结果表明,晶体结构微球排列有序度高,完美有序区范围在20μm以上,晶体表面层平整完美,在3μm×5μm的有序区内仅有2个点缺陷.     

二维胶体晶体成形及应用研究进展

综述了二维胶体晶体的结构特点及成形驱动力,介绍了LB（Langmuir—Blodgett）转移法、毛细组装法、电场沉积组装法、特殊装置组装法等二维胶体晶体成形方法的原理、成形过程及优缺点,同时概述了二维胶体晶体在微加工及微图案化、纳米传感器、纳米磁存储等领域的应用情况。     

三维光子晶体的化学方法制备与应用

描述了光子晶体的基本概念、特征及其材料组成。并详细介绍了用自组装制备三维半导体光子晶体的方法；为了提高电解质的折射率反差，以合成蛋白石为模板剂制备反相蛋白石的方法，最后论述了光子晶体的应用前景。     

光致变色染料螺(口恶)嗪对光子晶体能带结构的调节

利用垂直沉积法获得了聚苯乙烯(Polystyrene,PS)蛋白石模板,采用垂直提拉法将SiO2溶胶填充到PS蛋白石模板,制备出SiO2反蛋白石模板,并利用扫描电镜对蛋白石及反蛋白石的微观形貌进行表征.制备了一种光致变色染料渗透入光子晶体结构空隙的复合材料,该结构表现出截然不同于未填充染料时的蛋白石结构的光学性质.通过利用分子聚集体中的协同激励效应带来的折射率的剧变来实现光子晶体能带结构的控制.     

基于金-银合金材料的波导耦合金属光子晶体传感特性研究

改进Brust法,我们合成了1-己硫醇修饰的原子组成为Ag_0.66Au_0.33的合金纳米颗粒。以该合金纳米颗粒为构建单元我们采用溶液法成功组装了波导耦合一维合金光子晶体结构。利用该结构搭建的生物传感器的灵敏度是相同条件下纯金结构的2.5倍。金-银合金纳米颗粒组装的波导耦合金属光子晶体传感器以其低成本的制备工艺和简单的测试光路表现出潜在的应用前景。     

闪烁晶体材料的研究进展

闪烁晶体用于X射线和γ射线等高能粒子探测,在分子医学成像、高能物理、核物理、安全检查、材料无损探伤和地质探矿等领域有着广泛的应用。随着人们对闪烁晶体的更加深入的认识以及晶体生长技术的发展,许多已开发的闪烁晶体的性能得到优化和提高,应用范围也随之扩大,随着应用的更高要求,对闪烁晶体的综合性能要求越来越高,进一步设计、发现、开发和生长具有高密度、优良光学均匀性、高能束粒子阻止本领、高光产额、快衰减、高稳定性、低成本等综合优良性能的闪烁晶体仍然是闪烁材料研究的重点。简要综述了近年来卤化物、钨酸盐、锗（硅）酸盐、铝酸盐和硼（磷）酸盐等重要闪烁晶体材料的研究进展及其闪烁性能和应用前景。     

石英晶体微天平工作原理及其在腐蚀研究中的应用与进展

    简要介绍了石英晶体微天平(QCM)技术的基本原理,综述了QCM在腐蚀研究方面的应用及其进展,讨论QCM技术用于腐蚀研究的优点和局限性.     

利用无容器凝固BaTi2O5非晶球组装三维光子晶体及能带分析

应用无容器凝固法制备构造光子晶体的微球,获得批量成分均匀、尺寸均一的高折射率钛氧玻璃非晶球,并通过空间限位组装排列成三维蛋白石结构光子晶体。用平面波展开法模拟不同折射率的球所堆积的光子晶体的能带结构,分析了折射率对带隙位置和宽度的影响。结果表明,非晶球组成的三维蛋白石结构形成了不完全带隙,在该结构中沿[111]方向上,带隙随折射率的增大逐渐变窄并且向低频方向移动。     

纳米晶体材料热稳定性的研究进展

纳米晶体材料独特的结构特征使其具有不同于传统多晶材料的优异性能,如何提高纳米晶体材料的热稳定性,避免其过度粗化,是近年来材料领域研究的热点课题。本文综述了国内外对纳米晶体材料热稳定性的研究进展,简要介绍了纳米晶体材料的微观结构特点,着重分析了溶质原子、第二相颗粒和微观应力等因素对纳米晶体材料晶粒长大的影响规律,介绍了纳米晶体材料的热力学和动力学稳定机制。     

Thin film photonic crystals

Large area thin film photonic crystals consisting either of closely packed PMMA balls or their SnS₂ replicas have been synthesized and tested. The photonic bandgap (PBG) of these structures demonstrates a tendency towards omnidirectionality and a subsequent increase of the refractive index contrast (RIC) in the inverted opal structure. In particular, the bandgap width in SnS₂ replica exceeds that of PMMA opal by a factor of three. Observations of the PBG-related dip in photoluminescence spectra and the self-focusing of the emission of the dye/PMMA opal have proven the merit of quasi-three-dimensional photonic films in the control of light emission.     

Thermal properties of photonic crystals

We report on the analysis of thermal properties of two-dimensional (2D) photonic crystal. The changes in the transmission spectra under temperature effects have been analyzed. It is shown that the band gap width depends strongly on temperature and behaviors similar to the gap width in electronic crystals. The dispersion relation and the photon lifetime corresponding to the periodic coupled cavity structure have been investigated. A high sensitivity of cavity modes to the thermal nonlinearities has been found.     

Towards 3D photonic crystals

Synthesis of artificial opals with the structural and optical properties of three-dimensional (3D) photonic crystals has been carried out. We describe the stages of the uniform silica globules preparation by the multistage build-up method, their packing in the 3D lattice by centrifugation, and their sintering. The correlation between technological parameters used and structural and optical properties of the fabricated opals with the photonic band gap maximum range from 475 to 650 nm is discussed.     

Synthesis of thin film photonic crystals

We describe a synthesis procedure for fabricating thin film photonic crystals at optical length scales from a ceramic slurry of nanocrystalline titania and polystyrene spheres. Self assembly of the spheres is performed simultaneously with the introduction of the dielectric background. Thin film photonic crystals are grown on glass or semiconductor substrates. The photonic crystals are characterized with both surface and cross-sectional scanning electron microscope images. The photonic crystals exhibit a reflection peak and transmission dip at the wavelength of the first stop band.     

Exploring integration prospects of opal-based photonic crystals

Different methods of functionalisation of thin opal films are discussed, including synthesis of opals on pre-patterned substrates, post-synthesis electron beam lithography, preparation of opals with heterogeneous photonic band gap structure and integrating opals with light sources. These approaches have been tested experimentally and key technological problems have been identified.     

Designing synthetic optical media: photonic crystals

A new class of materials, called photonic crystals, affect a photon’s properties in much the same way that a semiconductor affects an electron’s properties. This represents an ability to mold and guide light that leads naturally to novel applications in several fields, including optoelectronics and telecommunications. We present an introductory survey of the basic concepts and ideas that underlie photonic crystals, and present results and devices that illustrate their potential to circumvent limits of traditional optical systems.     

Advances in 2D semiconductor photonic crystals

Two-dimensional photonic crystals (PCs) in thin-slab or waveguide structures open new possibilities in optoelectronic devices. We present experiments on a variety of structures and devices, as well as modelling tools, which show that 2D-PCs etched through waveguides supported by substrates are a viable route to high-performance PC-based photonic integrated circuits (PICs).     

Synthesis and optical properties of opal and inverse opal photonic crystals

We describe the synthesis of two complementary photonic crystals: opal and an inverted opal structure consisting of air spheres in a titania matrix. From optical measurements and comparison with the literature, the mechanical strength and effective refractive index are increased by sintering for opal and because of compression for the inverse opal. However, this is at the expense of reducing the PBG in the [1 1 1] direction.     

Fabrication and application of arrays related to two-dimensional materials

In recent years,two-dimensional(2D)materials have attracted extensive attention from researchers for their unique structures and electrical properties.2D materials have been widely applied in field effect transistors,sensors,and photodetectors.Integration is extremely important for practical applications in devices,which requires both minimal crosstalk and high performance.The fabrication of patterned arrays of 2D materials can realize high-density fabrication.In addition,the properties of 2D materials can be also adjusted by the patterned nanostructures.In this review,we summarize the emerging researches related to 2D materials and arrays.Firstly,the preparation strategies of different arrays have been introduced.Then,the applications of arrays have been investigated,such as physical unclonable functions,sensors,energy consumption,photoluminescence enhancement,quantum emitters and photodetectors.Finally,the prospects and existing challenges have been proposed.