Clustering study in Eu(DBM)3Phen-doped polymer optical fibers by optical properties and near-field scanning microscopy

The clusters of Eu3+ ion in Eu(DBM)3Phen-doped polymethyl methacrylate (PMMA) have been studied by three means. The relative fluorescence intensity ratio of the 5D0 → 7F2 to 5D0 → 7F1 transitions with different concentrations of Eu3+ in Eu(DBM)3Phen-doped PMMA and metastable-state (5D0) lifetime dependence on Eu3+ concentration are analyzed. The analysis indicates that there are no clustering effects in Eu3+ ions of Eu(DBM)3Phen-doped PMMA when the Eu3+ doping concentration is up to 1.0 wt.-%. At the same time, the clustering effect has not been observed by the scanning near-field optical microscopy (SNOM) in Eu(DBM)3Phen-doped PMMA with 1.0 wt.-% of Eu3+ ions. The analysis reveals that a high concentration of Eu3+ can be incorporated into polymer optical fiber (POF) without clustering effect.OCIS codes: 180.5810, 300.6280, 250.5460, 160.5690.     

Optical amplification of Eu(TTA)3Phen solution-filled hollow optical fiber

A liquid core optical fiber (LCOF) composed of hollow fiber and a solution of Eu(TTA)(3)Phen (TTA=2-thenoyltrifluoroacetone, Phen=1, 10-phenanthroline) in dimethyl sulfoxide (DMSO) has been fabricated, in which the concentration of Eu(TTA)(3)Phen in DMSO is 0.8 wt.%, the core diameter of the LCOF is 10 μm, and the fiber length is 8.1 cm. By the end pumping with a diode-pumped solid-state laser at 355 nm, a small optical signal at 613 nm was amplified with a gain of 8.2 dB at a pump power of 203 mW. Based on this experimental result, a liquid core optical fiber amplifier can be realized by the LCOF, which has wide potential applications in many optical devices.     

Sm(DBM)3Phen-doped poly(methyl methacrylate) for three-dimensional multilayered optical memory

We report on the formation of submicrometer voids within Sm(DBM)3Phen-doped poly(methyl methacrylate) (PMMA) under multiphoton absorption excited by an infrared laser beam. An ultrashort-pulsed laser beam with a pulse width of 200 fs at a wavelength of 800 nm is focused into doped PMMA. The large changes in refractive index and the fluorescence associated with a void allow conventional optical microscopy and reflection-type confocal microscopy to be used as detection methods. Voids can be arranged in a three-dimensional multilayered structure for high-density optical data storage.     

掺钕聚甲基丙烯酸甲酯的光学特性

研究了制备的掺钕螯合物Nd(DBM)3Phen材料的吸收光谱、激发光谱、荧光光谱,应用Judd-Ofelt理论计算了该材料的强度参量．分析了钕离子激发态4F3／2的辐射寿命(631 μs)和4F3／2→4IJ′跃迁的受激发射截面和荧光分支比．     

Fabrication and amplified spontaneous emission of Eu(DBM) <Subscript>3</Subscript>Phen doped step-index polymer optical fiber

A step-index polymer optical fiber (SI POF) with a core of poly(methyl methacrylate) (PMMA) containing Eu(DBM)₃Phen has been fabricated by a preform technique. Fluorescence analysis showed that there is not obvious change in the local environment around Eu³⁺with the increase of Eu(DBM)₃Phen doping concentration. Amplified spontaneous emission (ASE) phenomenon of the doped SI POF by end-pumping with an Ar⁺-laser of 457.9 nm at ambient temperature was observed. The threshold of the pump power for the onset of ASE is found to be 120 mW for the doped SI POF with a length of 50 cm, the length is also found to be the optimal length for maximum ASE power under the input power of 200 mW. The maximum quantum conversion efficiency of the fiber is about 40%.     

稀土配合物Eu(DBM)_3 phen/聚丙烯复合薄膜的光学性质

制备了Eu(DBM)3phen掺杂的聚丙烯(PP)薄膜复合材料。利用发光光谱技术,分别展示了Eu(DBM)3phen和Eu(DBM)3phen/PP薄膜的稳态光致发光光谱,比较了这两种材料的发光寿命。与纯的Eu(DBM)3phen相比,该复合材料的发光稳定性有较大的提高;观察到了折射率边界对Eu3+自发辐射速率的影响。     

Optical transition properties of Eu in Eu(DBM)3phen mono-dispersed microspheres for microcavity laser application

Mono-dispersed microspheres of ternary complex Eu(DBM)₃phen (DBM=dibenzoylmethide; phen=1,10-phenanthroline) were prepared through a facile process. The obtained sample was characterized by means of X-ray powder diffraction (XRD) and scanning electron microscope (SEM). And the luminescence properties of the Eu(DBM)₃phen were investigated by the fluorescence spectra and the fluorescence decay. According to Judd-Ofelt theory, the optical transition intensity parameters Ω_λ (λ=2, 4 and 6) were obtained to be 20.99×10⁻²⁰, 0.98×10⁻²⁰ and 1.79×10⁻²⁰ cm², respectively. The radiative transition properties of ⁵D₀ level, including transition rates, branch ratios and radiative transition lifetime were calculated. As a potential material for microsphere lasers, the optical gain performance for ⁵D₀→⁷F₂ transition was also evaluated.     

有机稀土Eu（DBM）3bath配合物电致发光

有机稀土Ｅｕ（ＤＢＭ）３ｂａｔｈ配合物电致发光＊梁春军李文连＊＊洪自若彭俊彪ａ）虞家琪ａ）赵丹赵东旭（中国科学院长春物理研究所，长春１３００２１）ａ）（中国科学院激发态物理开放研究实验室，长春１３００２１）关键词有机电致发光，稀土配合物，窄带发射近几...     

Syntheses and electroluminescent properties of two europium ternary complexes Eu(DBM)3(PBO) and Eu(DBM)3(PBT)

Two europium complexes, Eu(DBM)₃(PBO) and Eu(DBM)₃(PBT) (DBM=dibenzoylmethanato, PBO=2-(2-pyridyl)benzoxazole, PBT=2-(2-pyridyl)benzothiazole), were prepared and used as emitting materials in organic electroluminescent (EL) devices. The devices with the structures ITO/TPD/Eu(DBM)₃(PBO) (or Eu(DBM)₃(PBT)/BCP/Alq₃/Mg:Ag/Ag emit red light originating from the europium complexes.     

Eu(DBM)_3Phen掺杂聚甲基丙烯酸甲酯静电纺丝荧光纤维

通过静电纺丝技术获得直径约为700 nm,均匀且随机取向的亚微米级Eu(DBM)3Phen/PMMA纤维。在紫外光辐射下,亚微米级荧光纤维发出明亮的红色荧光。其激发光谱表明,荧光纤维有效激发波长范围为200~400 nm。利用积分球配以CCD探测器,在367 nm长波紫外LED激发下对荧光纤维开展绝对光谱功率测试。当LED泵浦功率为535.76#W时,厚度80#m的Eu(DBM)3Phen/PMMA纤维薄层对紫外辐射的吸收率高达89%,350~850 nm范围内发射的总绝对光谱功率、总光子数和总荧光量子产率分别为36.56#W、11.46×10~(13)cps和12.94%。亚微米级Eu(DBM)_3Phen/PMMA纤维薄层中,Eu~(3+)较高的跃迁发射几率及较大的发射截面使得纤维可以高效吸收紫外辐射并转变为可见光,在提高太阳能电池光电转换效率方面具有潜在应用价值。     

沉积法自组装三维有序的Eu(DBM)3Phen/SiO2胶体球

采用修饰的St ber法合成了300 nm的Eu(DBM)3Phen/SiO2胶体杂化球,并通过沉积法将这种胶体杂化球组装成厚度为5 mm,面积为12 cm2的三维有序结构。通过扫描电子显微镜观察发现这些胶体球在垂直于烧杯底面的所有层面中都显示了立方密堆积的结构。元素分析进一步证实了荧光分子被包埋在SiO2胶体球中。在355 nm的激发下,这种三维有序结构具有铕离子的特征发射。     

Hollow-core microstructured polymer optical fiber

We have fabricated microstructured polymer optical fibers that guide light in a hollow core using the photonic bandgap mechanism. The hollow core allows the use of polymer fibers to be extended to wavelength ranges where material absorption typically prohibits their use, with attenuation lower than the material loss observed in the infrared. The fabrication method is similar to other microstructured polymer optical fibers, which has favorable implications for the feasibility of manufacturing such bandgap fibers.     

LiNbO(3) platforms for optical fiber alignment

A technique for incorporating a groove into a LiNbO(3) substrate is described. Both V grooves for fiber alignment and vertical grooves for waveguide end-face formation can be fabricated with this technique. The proposed fabrication method is based on an excimer-laser ablation and a high-speed rotation saw cut for LiNbO(3) . The former process provides a variety of cross-sectional groove shapes by changing the ablation mask shape of LiNbO(3) , and the latter provides an optical-quality cutting face. The proposed fabrication method is simple and provides low-cost optical platforms not only for LiNbO(3) but also for glasses, polymers, and semiconductors.     

Eu(TTFA)3掺杂环氧基光刻胶薄膜的强烈红色荧光

合成了稀土配合物Eu(TTFA)3（TTFA, 2 thenoyltrifluoroacetone）掺杂的环氧基紫外负性光刻胶薄膜,采用荧光分光光度计对其光致发光特性进行了系统表征.荧光光谱分析表明,Eu(TTFA)3掺杂的光刻胶薄膜具有很宽的激发谱带（200 ~ 400 nm）,且在长波紫外区表现为强激发,说明有机配体TTFA-与中心离子之间存在着比电荷迁移带更有效的能量传递.配体TTFA-的三重激发态和Eu3+的激发态能级匹配较好,能很好地敏化Eu3+而发出明亮的红光,是获得Eu3+红色荧光发射的优良配体,认证了有机配体与稀土离子之间产生有效能量传递的前提是存在“天线效应”.     

S+C band optical amplification in Er3+-Tm3+ co-doped fiber

A new type of optical amplifier based on co-doping erbium in thulium doped fiber is proposed to realize S+C band gain by dual-wavelength (800+1410 nm) pumping scheme which is obtainable from laser diode.A novel model is established for the co-doped fiber considering the Er3+ to Tm3+ energy transfer process.Using appropriate fiber parameters and energy transfer parameters, the coupled rate equations are analyzed and solved; the concentrations of Er3+ and Tm3+ and fiber length were optimized to get more uniform gain. The results predicted that the S+C band gain can be achieved at the same time by co-doping erbium in thulium doped fluoride fiber.     

Selective amplification of scars in a chaotic optical fiber

In this Letter we propose an original mechanism to select scar modes through coherent gain amplification in a multimode D-shaped fiber. More precisely, we demonstrate the selective amplification of scar modes by positioning a gain region in the vicinity of the self-focal point of the shortest periodic orbit in the transverse motion.     

Rhodamine 6G-doped polymer optical fiber amplifiers

Rhodamine 6G-doped step-index polymer optical fiber is fabricated.The characteristics of the am-plification of rhodamine 6G-doped step-index polymer optical fiber amplifier have been studied.Thehigh-gain optical amplification with a tunable wavelength range from 585 to 613 nm is obtained in a step-index polymer optical fiber doped with rhodamine 6G at 10-ppm level,which can be used for broadband amplifiers and tunable lasers.     

Cellulose acetate polymer film modified microstructured polymer optical fiber towards a nitrite optical probe

A novel microstructured polymer optical fiber (MPOF) probe for nitrites (NO₂⁻) detection was made by forming rhodamine 6G (Rh 6G)-doped cellulose acetate (CA) on the side wall of array holes in a MPOF. It was found that the MPOF probe only have a response to nitrites in a certain concentration of sulfuric acid solution. The calibration graph of fluorescence intensity versus nitrites concentration was linear in the range of 2.0 × 10^− 4 g/ml-5.0 × 10^− 3 g/ml. The method possesses ease of chemical modification, low cost design, and potential for direct integration with existing instrumentation, and has been applied to the determination of nitrites in real samples with satisfactory results.     

Bragg光纤光栅与光纤传感技术

光纤光栅及其应用技术的出现和发展将成为光纤通信、光纤传感以及在各相关领域中具有变革意义的新一代高新技术。本文对光纤光栅的致光机理、各种典型成栅技术作了评述。阐述了光纤光栅传光原理，并对３Ｓ系统的概念、体系结构和技术上的问题以及研究现状和发展作了综述。     

Optical amplitude multiplexing through parametric amplification in optical fibers

We propose a new technique that uses parametric amplification in optical fibers to combine two binary signals into a single quaternary amplitude-shift keying (4-ASK) signal. We develop a theoretical model to predict the power level distribution of the 4-ASK signals as a function of the extinction ratios of the input binary signals. Computer simulation results agree with the predictions of this theoretical model within a 0.9 dB margin. We also analyze the application of this technique to the generation of quaternary-amplitude optical packets, which are attractive for allowing the label to be transmitted in the same bandwidth and simultaneously to the payload. Our results indicate that such optical packets may be propagated through lengths comparable to those involved in metropolitan area networks.