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1.
用合成的3-三氟甲基苯侧基聚醚砜(3F-PES)作为波导芯层材料制作了新型硅基聚合物阵列波导光栅(AWG)复用器.采用DSC,TGA和AFM等方法对3F-PES的光学性质和热稳定性进行了表征.DSC和TGA结果显示,3F-PES的玻璃化转变温度为170℃,在空气中5%的热失重温度为542℃,表明具有非常好的热稳定性.3F-PES溶液在旋涂时具有很好的成膜性,AFM照片显示,粗糙度起伏为0.35nm.近红外吸收谱表明,3F-PES在光通讯波段有较小的吸收,适合用来制作低损耗的光波导器件.用3F-PES作为波导芯层材料制作的八通道硅基聚合物阵列波导光栅(AWG)复用器的通道间隔为1.603nm,中心波长为1550.15nm.  相似文献   

2.
偶氮聚合物光致表面起伏光栅研究涉及一系列光和聚合物相互作用的基本科学问题,是近年来国内外研究的热点.将软刻为代表的微加工技术和偶氮表面起伏光栅光刻方法相结合,为表面起伏光栅的制备和应用开辟了新的途径.本文综述偶氮化合物表面起伏光栅光刻和软印刷复制等方面的最新研究进展,并介绍功能性光栅结构和器件在太阳能电池、液晶定向层及...  相似文献   

3.
偶氮苯侧链型高分子由于其含有偶氮苯基团 ,在光作用下会发生可逆的顺反异构过程 ,具有光致取向特性 ,在光学处理、衍射光学、投影显示、光开关等许多方面具有潜在的应用性[1] .近 1 0多年来国内外学者对此类化合物进行了广泛的研究 ,已有文献报道可利用Ar+激光束在偶氮苯聚合物薄膜上直接“写入”表面凸起光栅 ,并且通过原子力显微镜观测到光栅起伏 .这种光栅很稳定 ,并可以利用光学方法“擦去” .偶氮苯聚合物上述独有的性质引起了许多学者的兴趣[2 ,3] .另一方面 ,由于旋光性聚合物在光学物理性质上的优势 ,我们已将手性基团引入偶氮苯…  相似文献   

4.
全息光波导具有体积小、重量轻、成像清晰、设计灵活、可为使用者提供较大的眼动范围等诸多优势,是头戴式增强现实显示器(HMD-AR)中最实用的波导耦合技术.为提升HMD-AR系统的成像能力,扩大其视场范围,作为耦入和耦出元件的体全息光栅(VHG)须具有高的折射率调制度(Δn).光致聚合物是制造高性能透明VHG材料中最有潜力的一种记录介质.本综述介绍了HMD-AR中全息光波导的工作原理和光致聚合物VHG的制备原理,梳理了近期该领域中光致聚合物的研究进展,归纳总结了光致聚合物配方中的光引发体系、成膜树脂、记录单体和纳米粒子等添加剂以及记录介质的后处理方式对其全息光学性能的影响,以期为设计新组分、研发Δn更高的记录介质、制备性能更优的HMD-AR提供指导.  相似文献   

5.
二阶非线性光学聚氨酯对电光效应的共振增强   总被引:1,自引:0,他引:1  
二阶非线性光学聚合物是最有希望实现在电光器件方面应用的材料之一.该类材料的非线性光学系数很高,响应速度快,与半导体材料的相容性较好,且比有机和无机晶体的制备更方便.目前所用的电光调制器多为光传输型,高光学活性的极化聚合物一般光学损耗较大,尤其是其吸收波段更大,使得调制器只能在其透明波段内使用,否则,传输型波导器件由于这种损耗将无法使用.  相似文献   

6.
光通讯波段聚合物光波导材料的研究进展   总被引:8,自引:0,他引:8  
禹忠  汪敏强  姚熹 《化学通报》2001,64(1):5-10
光学聚合物由于其在光通讯领域的集成光电器件与光互连应用方面有经济和实用价值而备受关注。本文介绍了光通讯波段有机聚合物光波导材料的特点和研究进展。  相似文献   

7.
光波导材料对于光通信及光互联产业的发展起着至关重要的作用,例如可用来制作波分复用系统中的光衰减器,热光开关,阵列波导光栅复用/解复用器,光滤波器等.聚合物材料由于其容易加工,与无机材料相比有相对较低的制作成本,而从众多光波导材料中脱颖而出.目前光通讯材料与器件的研究应用主要集中在1.3和1.55μm两个波长上,然而随着波分复用(WDM)技术的发展,  相似文献   

8.
长周期光纤光栅对铜离子的检测研究   总被引:2,自引:0,他引:2  
利用有机反应在长周期光纤光栅表面制备了一层高分子材料敏感膜,用扫描电子显微镜(SEM)、X射线型能谱仪(EDX)等检测手段对高分子敏感膜层进行了分析表征,并利用敏感膜时溶液中的铜离子进行了光学检测。结果表明,该高分子敏感膜能够较好地确定铜离子的存在,证明了利用长周期光纤光栅对铜离子进行检测是可行的。  相似文献   

9.
含苯并噻唑偶氮发色侧基的两种非线性光学高分子   总被引:3,自引:1,他引:2  
含苯并噻唑偶氮发色侧基的两种非线性光学高分子刘志红,过俊石,谢洪泉(华中理工大学化学系武汉430074)关键词苯并噻唑,聚氨酯,聚丙烯酸酯,非线性光学聚合物用于集成光学光波导电光调制器件的非线性光学聚合物要求具有大的电光系数、高透明性、良好的加工性能...  相似文献   

10.
三聚氰胺甲醛树脂的光学性质   总被引:1,自引:0,他引:1  
现代信息技术的发展和要求,使得光信息传输、光电子、全光子器件成为信息技术研究领域的热点.而光学传输损耗低,非线性系数大和响应速度快的新型光学材料和器件是决定信息研究领域发展的关键 [1] .目前新型光学材料研究领域之一是聚合物材料在光学中的应用.因此,近年来人们对一些聚合物材料的光学性质进行了研究,例如聚甲基丙烯酸甲酯 (PMMA)、聚碳酸酯 (PC)、聚酰亚胺、环氧树脂等等[2,3].对于聚合物材料在光学方面应用的基本要求是具有良好的成膜性、光学损耗低、热稳定性好.本文所研究的三聚氰胺甲醛树脂(Mel…  相似文献   

11.
A polymeric waveguide film was manufactured by spinning the materials on quartz substrate. Two‐photon‐initiated photopolymerization was carried out by tight‐focusing femtosecond laser pulses in the two‐mode planar waveguide. A typical index‐modulated grating of 2.5 × 2 mm areas without morphology was fabricated. The results show that peak‐to‐peak modulation depth of the surface profile of grating region was only about 7 nm. The diffraction efficiency (DE) of the grating with a spacing period 2 µm was 0.17% and the corresponding index modulation reached 5.7 × 10?3. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

12.
<正>自1999年烯类单体的双光子聚合方法被发现以来[1],其产物在光开关制备[2]、光子晶体[3]、微机械[4]及三维微加工[5]等领域得到了广泛的应用.由此,烯类双光子聚合机理也成为人们研究的焦点[6].到目前为止,研究者们普遍认为烯类单体的双光子聚合反应属于自由基历程,各种利用双光子  相似文献   

13.
We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficient and the optical Kerr coefficient are measured with laser pulses of 250 fs duration at 800 nm wavelength. The one-photon and two-photon figures of merit are determined to be 3.1 and 1.3, respectively, at irradiance of 2 GW/cm(2). The observed nonlinearities have a recovery time of approximately 1 ps. The two-photon-generated free carrier effects have also been observed and discussed. These results demonstrate that CdS NCs embedded in polymeric film are a promising candidate for optical switching applications.  相似文献   

14.
Two carbazole-based polymerization initiators possessing blue fluorescence emission have been synthesized via Wittig reaction in the solid phase at room temperature. Two-photon excited fluorescence (TPEF) spectra for them were investigated under 800 nm fs laser pulse and two-photon absorption cross sections were determined by the Z-scan technique. Then two-photon initiating polymerization (TPIP) microfabrication experiments were successfully carried out. Three-dimensional lattice and artificial defects were gained, indicating that they were viable candidates for the two-photon polymerization initiator in practical application of microfabrication. Supported by the National Natural Science Foundation of China (Grant Nos. 50532030, 20771001 & 50703001), and Team for Scientific Innovation of Anhui Province (Grant No. 2006KJ007TD)  相似文献   

15.
Preliminary tests on the sensibility to external environment of an optical waveguide filter operating in the near infrared region are reported. Device consists of a hybrid sol–gel based grating loaded channel waveguide. Several techniques were implemented to obtain the final device. A hard master with gratings produced by Electron Beam Lithography was employed to fabricate a transparent soft mold. UV-nanoimprinting technique, exploiting the soft stamp, was used to reproduce on the hybrid photosensitive sol–gel film the planar grating. Optical lithography was finally applied to manufacture the grating loaded channel waveguide which is our final integrated sensor. The device was optically characterized by transmission measurements in the range 1,450–1,590 nm and its sensibility to external environment was tested in air and water.  相似文献   

16.
The film formation method has been successfully used to grow single crystals and other complex morphological features of low melting form (LMF) and high melting form (HMF) of trans-1,4-polyisoprene (TPIP). Below 40 °C dilute amyl acetate solution gave hexagonal shaped LMF crystals. Thick and elongated hexagonal shaped morphology was shown by HMF crystals at temperatures above 40 °C. Straight faces and sharp corners of the single crystals, and also of complex crystals, acquired round shapes when highly polydispersed TPIP was used for crystallization.  相似文献   

17.
合成了含环氧基团的可交联的甲基丙烯酸甲酯和甲基丙烯酸环氧丙酯的共聚物[Poly(MMA-co-GMA)],通过FTIR,NMR,GPC,DSC和AFM等技术对其进行了表征. 结果表明,所合成的聚合物材料具有较好的成膜性; 通过热固化使引入的环氧基团开环交联,该聚合物的玻璃化转变温度(Tg)比固化前提高了24 K,同时有效地降低了聚合物的双折射率. 用Poly(MMA-co-GMA)作为包层材料,双酚A型环氧化合物作为高折射率材料, 将其引入到包层材料中形成芯层材料的折射率在波长1.55 μm处可调,其范围是1.483~1.588. 采用旋涂、 铝掩膜和氧反应离子刻蚀的方法(RIE)制得了阵列式光波导. 测试结果表明,制作的波导在1.55 μm处实现了光的单模传输,光损小于3.0 dB/cm.   相似文献   

18.
Organic electrode materials have attracted more and more attention for sodium-ion batteries (SIBs) that are regarded as one of the most promising alternatives of lithium-ion batteries, because they can endure the storage of large sodium ions (with a larger radius than that of lithium ions) without obvious volume change. Herein, we report a novel conjugated porous polymer (TPIP) based on triazine and imide as cathodes material for SIBs. TPIP has abundant redox-active sites, good thermal stability (400°C) and large specific surface area (306 m2 g−1). As a result, TPIP electrode delivered a specific capacity of 120 mAh g−1 after 50 cycles at a current density of 0.1 A g−1 and 85 mAh g−1 after 150 cycles at a current density of 1.0 A g−1. Ex-situ X-ray photoelectron spectra and Fourier transform infrared spectra showed that the TPIP electrodes reversibly stored three sodium ions per unit through the triazine rings and half of the carbonyl groups. These results deepen our understanding of charge storage mechanisms of polymers with triazine and imide units and will provide guidance for the future design of electrode materials for high-performance SIBs.  相似文献   

19.
介绍了近几年来我们研究组在层状组装膜的构筑以及功能化研究方面取得的一些最新进展.包括结合表面溶胶-凝胶技术与静电层状组装技术,实现了二阶非线性基团在层状组装多层膜中的非对称排列,制备了具有二阶非线性效应的膜材料;采用室温压印技术,发展了一种简便、经济和具有普适性的层状组装聚合物膜图案化方法;以轻度交联的聚合物微凝胶为构筑基元,制备了具有高负载量的聚合物层状组装膜;发展了一种基于离子剥离技术的层状组装自支持膜制备方法;基于层状组装技术,制备了具有超疏水和抗反射功能的涂层.  相似文献   

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