Silicon-Based Asymmetric Add-Drop Microring Resonators with Ultra-Large Through-Port Extinctions

We theoretically simulate and experimentally demonstrate ultra-large through-port extinctions in silicon-based asymmetrically-coupled add-drop microring resonators （MRs）. Through-port responses in an add-drop MR are analyzed by simulations and large extinctions are found when the MR is near-critically coupled. Accurate fabrication techniques are applied in producing a series of 20 μm-radii add-drop microrings with drop-side gap-widths in slight differences. A through-port extinction of about 42. 7 dB is measured in an MR with through- and drop-side gap-width to be respectively 280nm and 295nm. The large extinction suggests about a 20.SdB improvement from the symmetrical add-drop MR of the same size and the through-side gap-width. The experimental results are finally compared with the post-fabrication simulations, which show a gap-width tolerance of 〉 30 nm for the through-port extinction enhancement.     

Analysis of Temperature Dependence of Silicon-on-Insulator Thermo-Optic Attenuator

The temperature dependence of silicon-on-insulator thermo-optic attenuators is analysed, which originates from the temperature dependence of characteristics of multimode interference. The attenuator depth and power consumption are independent of temperature while the insertion loss depends on the temperature heavily. The variation of the insertion loss decreases from 4.3 dB to i dB as the temperature increases from 273K to 343K.     

6,6’-二硫二烟酸构筑的锌配位聚合物的合成、晶体结构和荧光性能

本文以6,6'-二硫二烟酸为主配体,通过水热法合成了新的配合物{[Zn(cpds)(dpa)]·H₂O}_n(1)(H₂cpds=6,6'-dithiodinicotinic acid,dpa=dipyridin-2-ylamine)。用X-射线单晶衍射分析确定了配合物为三斜晶系,P1空间群,其晶体学参数为a=0.8467(2),b=1.1674(3),c=1.2265(3)nm,α=73.605(3)°,β=78.656(3)°,γ=81.484(3)°,V=1.1347(5)nm³,D_c=1.850g·cm^-3,Z=2。结构分析表明配合物1为一维链状结构,相邻一维链之间堆积形成三维超分子网络结构。本文还研究了配合物的热稳定性和荧光性质。     

检测禽流感H5亚型病毒的阻抗型免疫研究

研制了一种可用于H5亚型禽流感病毒快速检测的阻抗型免疫传感器。通过蛋白A将H5N1表面抗原血凝素(HA)的单克隆抗体固定于金叉指阵列微电极表面,并与待测溶液中的目标抗原H5N1进行免疫反应。在[Fe(CN)6]3"/4"溶液中进行电化学阻抗谱扫描,表征电极的表面修饰及抗原捕获过程。当H5N1病毒浓度在21～26 HA unit/50μL范围时,其浓度的对数值与叉指阵列微电极的电子传递阻抗的变化值呈线性关系,相关系数为0.9885;检出限为20 HA unit/50μL,检测时间为1 h。此传感器特异性好,灵敏度高,可以重复使用,在病原微生物快速检测领域具有良好的应用前景。     

应用于单分子测序的纳米微结构器件

基因测序技术是现代最为重要的生物医学研究手段之一,单分子测序技术作为最新一代测序技术被广泛研究,并形成了微纳制造、光电子、微流控和分子生物学等多学科的交叉探索和多种技术创新的有机结合.文章系统总结了应用于单分子测序的纳米微结构器件的原理和功能,重点阐述了零模波导器件和纳米孔器件在单分子测序中的作用以及制备工艺,从器件的角度提出了单分子测序技术所面临的挑战.     

A novel highly efficient grating coupler with large filling factor used for optoelectronic integration

A novel highly efficient grating coupler with large filling factor and deep etching is proposed in silicon-on-insulator for near vertical coupling between the rib waveguide and optical fibre.The deep slots acting as high efficient scattering centres are analysed and optimized.As high as 60% coupling efficiency at telecom wavelength of 1550-nm and 3-dB bandwidth of 61 nm are predicted by simulation.A peak coupling efficiency of 42.1% at wavelength 1546-nm and 3-dB bandwidth of 37.6 nm are obtained experimentally.     

硅基波导慢光器件及其应用

硅基波导慢光器件是构建全光智能互连和实时高速测控等下一代信息技术的关键器件,在光通信和光信息处理等诸多领域具有显著的技术优势和巨大的应用潜力.随着器件结构的不断创新以及微电子制造技术的不断升级换代,硅基波导慢光器件愈来愈走向实用化.文章介绍了慢光的基本原理,概述了当前国内外硅基波导慢光器件的研究进展,着重分析了基于微环谐振腔的硅基波导慢光器件,并指出了它在具体应用领域中的发展前景.     

发光的异核稀土配合物装饰氧化石墨烯片

采用非共价键的方法制备一种新型的高荧光性能氧化石墨烯-异核稀土杂化材料。利用苯甲酸(BA)和菲咯啉(Phen)与Sm~(3+)和Gd~(3+)配位,并作用在氧化石墨烯片(GOSs)表面,制备了一种异核稀土配合物。所制备的产物通过傅里叶变换红外光谱、X射线衍射、扫描电子显微镜、荧光光谱仪、荧光寿命和热重分析来表征。该杂化材料具有强发光强度、长的寿命和良好的热稳定性。此外,Gd~(3+)对材料具有很强的敏化作用,同时Gd~(3+)在提高发光强度方面起着重要作用。氧化石墨烯的存在不会淬灭杂化材料的荧光性能。此外,还研究了具有不同物质的量之比的Sm~(3+)和Gd~(3+)的荧光特性。