共查询到18条相似文献,搜索用时 0 毫秒
1.
2.
响应性光子晶体(Responsive photonic crystals,RPCs)具有无毒、无标记、低消耗和裸眼可视的优点,pH响应性光子晶体(pH-RPCs)为食品安全、生物医药、水体环境等领域提供了一种简便的检测方式。目前主要发展了胶体粒子组装体/反蛋白石、层状堆叠和全息三种结构类型的pH-RPCs。本文在介绍光子晶体(Photonic crystals,PCs)pH响应原理的基础上,从制备方法、结构特点和pH响应性能(如灵敏度、响应时间、可视化)等方面对上述pH-RPCs进行了详细的综述,分析总结了它们各自的优势和不足,并对其未来的发展进行了展望。 相似文献
3.
4.
5.
6.
7.
光子晶体是至少两种不同折射率介质周期性排列而成的有序结构材料,通过改变其平均折射率或晶格间距等参数可以实现对光的调控。响应性光子晶体结构与分子印迹技术相结合制备的分子印迹光子晶体化学传感器因特异性强、灵敏度高且具有自表达能力等优点而受到人们的青睐,为微量及痕量物质的检测提供了新思路。本文着重介绍了基于二维和三维光子晶体的传感材料,尤其是分子印迹光子晶体(MIPC)的制备方法、性能特点和应用研究进展,对分子印迹光子晶体在可视化检测的研究前景做了展望,对提高分辨率、稳定性等问题做了分析。 相似文献
8.
新型光学/声学带隙材料研究进展 总被引:3,自引:0,他引:3
光子晶体/声子晶体研究是材料、物理、光学、化学等学科的一个全新领域和研究热点.概述了光子晶体/声子晶体的特性及应用,比较、综述了光子晶体/声子晶体的研究进展及面临的主要问题,评述和展望了光子晶体/声子晶体的发展趋势和应用前景. 相似文献
9.
10.
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
11.
Presented below is a new, Standard Coupled-mode Theory (CMT) based approach for analysis of optical characteristics of holey photonic crystals (i.e., photonic devices, built on periodicity of holes in dielectric media). This class of devices encompasses the majority of photonic crystal fibres and several kinds of modern thresholdless lasers. Naturally, holey photonic crystals were considered as a sequence of holes, surrounded by dielectric media. This model made it impossible to utilise CMT for analysing their characteristics. The underlying idea of our approach is a different physical model, considering holey photonic devices as a sequence of coupled dielectric spots (waveguides), surrounded by air. This model can be combined with the Standard Coupled-mode formalism. The latter combination allows fast (on a timescale of several minutes to tens of minutes) and accurate analysis of holey photonic devices. Moreover, it gives a deeper insight into the behaviour of EM fields in holey photonic crystals. 相似文献
12.
José Rodríguez García Miguel García Granda Susana Fernández 《Journal of Modern Optics》2013,60(7):927-935
In this paper, the possibilities of designing refraction index optical sensors in planar waveguide photonic crystals are demonstrated for the first time. Photonic crystals obtained by connecting in cascade planar optical waveguides with high index contrast are analyzed. Photonic band gaps (PBGs) and photonic windows (PWs) were obtained. If a local defect is introduced in the PBG structure, the optical path length is modified and on states can be created in the gap. Besides, the on states wavelengths can be tuned if the optical path of the defect is modified: changing the physical length and/or the refraction index of the defect. In this way, planar waveguide photonic crystals could be used for sensing applications when a specimen modifies the refraction index lattice site. Sensing properties of planar waveguide photonic crystals, with one, two and three sensing channels, are demonstrated. 相似文献
13.
Fangfang Liu Shufen Zhang Yao Meng Bingtao Tang 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(34)
Responsive photonic crystal is widely considered in the field of anti‐counterfeiting and information encryption because of their structural color changes caused by external stimulation. However, the response signal is usually achieved by adjusting the periodic lattice constant based on Bragg's law with volume changes. Thus, it is a great challenge to achieve the response of photonic crystals by non‐array parameter control. Herein, novel thermal responsive photonic crystal (TRPC) with low angle dependent structural color is fabricated by introducing poly(ethylene glycol) into the structure of low angle dependent SnO2 inverse opal. The response is achieved through the control of light path guided by phase transition and the significant volume change caused by the change of traditional array parameters can be effectively avoided. Meanwhile, the low angle dependent structural color of TRPC can effectively reduce the interference of observation angle change to response signal caused by external thermal stimulation. Patterned responsive photonic crystals with temperature gradient response are easily obtained by combining confinement self‐assembly and direct template method, and the patterns can be presented and hidden by the control of light path, showing great potential in anti‐counterfeiting and information encryption fields. 相似文献
14.
非晶无序光子晶体结构色机理及其应用 总被引:2,自引:0,他引:2
结构色是一种由光学尺度的微纳结构与光相互作用形成干涉、衍射或散射而产生颜色的物理生色效应。与化学生色不同,结构色由于没有色素或者染料的参与,因此没有颜色褪色的现象,同时能够避免使用染料和色素带来的环境污染。目前结构色材料受到研究者和应用开发人员的广泛关注,大量的研究发现结构色可以来源于光子晶体与非晶光子晶体两种结构。光子晶体由规整的周期性结构组成,产生的颜色鲜艳却具有明显的角度依赖性。而非晶光子晶体,其"自身缺陷"导致的短程有序结构具备了各向同性的光子带隙、非虹彩效应、光局域化等特点,赋予了材料柔和亮丽不随角度变化的显色效果,可控的激光效应以及优良的发光效率,从而更能满足材料领域对光散射和光传输等方面的特殊需求。对非晶光子晶体的概念和结构,与可见光作用产生颜色的原理,以及制备非晶光子晶体的不同方法(平板刻蚀法、胶体颗粒自组装法、模板法、相分离法)做了详细的讨论,并对非晶光子晶体产生的结构色效应在光电器件、功能涂料和纺织材料等多个领域中的应用进行了展望。 相似文献
15.
16.
Abstract Based on the transfer matrix theory, general conditions of polarization-independent transmissions in one-dimensional photonic crystals are derived. It is shown that the polarization-independent transmissions are obtained in photonic crystals consisting of two alternating layers with the same refraction index and optical thickness as well as the mutually reciprocal wave impedance. By using two different photonic crystals satisfying the above relation to constitute the light quantum-well structures, the structures have polarization-independent transmission properties. When a defective layer with wave impedance of 1 is introduced in the photonic crystals, the defective photonic crystals also have the polarization-independent transmission properties. In addition, polarization-independent low-pass spatial filters are achieved based on these photonic crystal structures. 相似文献
17.
Basing on the self-collimation effect of photonic crystals, one-to-two beam splitter, beam bend and one-to-three beam splitter are, respectively, designed by introducing a different line defect along the same direction. From the equal-frequency contour plot which is calculated by the plane wave expansion method, we obtain the frequency and the propagate direction of the self-collimated beam. The self-collimated beam propagation in photonic crystals with different line defects is simulated by the two-dimensional finite-difference time-domain method with perfectly matched layer absorbing boundary conditions. The simulation results show that one-to-two beam splitter, beam bend and one-to-three beam splitter can be realized by appropriately arranging the line defect along the proper direction. Such devices can greatly enhance photonic crystals for use in high-density optical integrated circuits. 相似文献