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全内反射

全内反射的相关文献在1986年到2022年内共计337篇,主要集中在无线电电子学、电信技术、物理学、自动化技术、计算机技术 等领域,其中期刊论文75篇、会议论文9篇、专利文献314016篇;相关期刊56种,包括科技创新导报、强激光与粒子束、现代电视技术等; 相关会议9种,包括全国第四届塑料光纤、聚合物光子学会议、2007年全国微波毫米波会议、2006北京地区高校研究生学术交流会等;全内反射的相关文献由625位作者贡献,包括徐紫宸、江晓清、王明华等。

全内反射—发文量

期刊论文>

论文:75 占比:0.02%

会议论文>

论文:9 占比:0.00%

专利文献>

论文:314016 占比:99.97%

总计:314100篇

全内反射—发文趋势图

全内反射

-研究学者

  • 徐紫宸
  • 江晓清
  • 王明华
  • 廖晓玲
  • 刘俭
  • 刘旭
  • 刘辰光
  • 匡翠方
  • 陈刚
  • 李波
  • 期刊论文
  • 会议论文
  • 专利文献

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    • 邬融; 孙明营; 周申蕾; 乔战峰; 华能
    • 摘要: 衍射光栅已在波导中得到广泛应用, 能将光束或图像从耦入端传输并在预定位置耦合输出, 不过在应用于诸如增强现实/虚拟现实等大视场角(field of view, FOV)、彩色光源时会存在FOV不匹配、视场缺失、出射不均匀等问题. 故从这些物理问题出发, 推导出衍射波导的FOV上限、视场完整的理论边界公式, 在此基础上再分别针对单色波和复色波进行深入研究. 得出单层衍射波导在常规高折射率n = 1.75条件下, 支持单色波FOV理论上限约48°, 支持复色波颜色系数q = 1.3的FOV理论上限26.4°, 更大FOV就需要配置更高折射率和更小q值. 视场完整性的边界条件表明, 减小长波的最大衍射角和减薄波导厚度就能解决视场缺失的问题, 实用最大衍射角一般不超过75°, 波导层厚度根据FOV大小一般在0.5—1.0 mm之间. 最后提出将各全内反射视场展开为光线追迹图的方法和瞳孔均摊接收各角度光能的分布函数, 就此可求解光栅耦出区的最佳位置, 并利用分布函数的倒数来约束投射光的角分布或者光栅效率的角分布, 以在任意位置都能接收均匀出射视场: 单色波导的均匀性从0.27提高到0.15, 单光栅复色波导中长波均匀性从0.40提高到0.28. 这些研究结果有助于解决衍射波导用于大FOV和复色光的难题.
    • XU Jing-jie; HUANG Hui; CUI Yu-han
    • 摘要: 本文给出双轴各向异性介质表面的Goos-H(a)nchen(GH)位移和Imbert-Fedorov(IF)位移.根据电磁波在介质中传播需要遵循的色散方程和在介质分界面上需要遵循的相位匹配条件,得到双轴各向异性介质表面发生全反射的条件.在此基础上根据稳态相位法和能流法得到发生全反射时GH位移和IF位移的表达式.
    • 赵振业; 徐春华; 李菁华; 黄星榞; 马建兵; 陆颖
    • 摘要: G-quadruplex (G4) is a DNA structure which commonly exists in human genome,and it is considered as an important structure in DNA metabolism such as replication,transcription and homologous recombination.The Gquadruplex helicases have been widely investigated these years.Of them,the Bloom (BLM) helicase is most thoroughly studied.However,there are some basic problems that are still unclear.Most of previous studies of G4 are performed by single molecule fluorescence resonance energy transfer technique.The G4 is in a free state in these experiments,which is different from the physiological environment in cells.The traditional magnetic tweezers have a limitation of spatial resolution in a low force circumstance.Thus here we use high resolution magnetic tweezer under the illumination of total internal reflection fluorescence to study the process of BLM resolving G4.Our modification of magnetic tweezer is to separate the measurements of force and distance of magnetic tweezer in order to improve the spatial resolution,which allows us to observe the unfolding process of G4.With a 2-3 pN force we find that the process of BLM unfolding G4 in low ATP concentration is stepwise,and the G4 is mainly in the state between G-quadruplex and G-triplex.We also find that the BLM could interact with G4 for a long time.Our apparatus is also able to obtain the long time observation results compared with the single molecule fluorescence technique.So we perform experiments with a nearly saturated ATP concentration.We find that the BLM has two ways to maintain G4 dissolution in this condition.The BLM could unfold the G4 repetitively in a long period and it could also keep the G4 in unfolding state for a long time after it has opened the G4.Finally,we also perform single molecule fluorescence resonance energy transfer experiment in the same condition,and we find that the 2-3 pN force in magnetic tweezers has a rare influence on the process of BLM interacting with G4.The results of single molecule fluorescence resonance energy transfer experiments are corresponding to the results of magnetic tweezer in the same conditions.All of our experimental results show that ATP dependent BLM has a high affinity with G4 and BLM has a different way to resolve G4 in high ATP concentration.These results could provide new ideas of the mechanism of BLM resolving G4.Our modified magnetic tweezer shows its capacity in G4 single molecule study,and it could be a useful tool in the future single molecule studies.%G-四联体(G-quadruplex,G4)是广泛存在于细胞基因组中的一种DNA结构,在DNA的代谢如复制、转录、同源重组等过程中起重要作用.G4解旋酶近年来受到广泛研究,其中Bloom (BLM)解旋酶的研究已经相当丰富,但仍有一些基本问题不清楚.我们应用全内反射瞬逝场照明磁镊对BLM解旋G4的动力学过程进行了深入研究,观察到了BLM解旋G4的分步过程.相对于单分子荧光共振能量转移技术而言,借助磁镊的长时间观测性能,我们在近饱和三磷酸腺苷(ATP)浓度的实验体系中观察到BLM长时间反复解开G4或者长时间维持G4于打开状态的两种作用方式.最后,使用相同的实验条件做了单分子荧光共振能量转移实验,确定了加载2-3 pN的外力对BLM解旋G4没有显著影响.
    • 邬融; 田玉婷; 赵东峰; 李大为; 华能; 邵平
    • 摘要: 当前高功率激光装置系统中,国内使用透射式衍射光栅进行光束采样,国外甚至使用光栅聚焦并同时结合谐波分离和采样功能.高功率激光辐照下,除了0级透射打靶光以及目标取样光外,其他级次衍射光的影响也不可忽视,可能造成诸如鬼像聚焦破坏、时间脉宽测量不稳定、近远场测量噪声等问题.尤其是透射衍射光栅内部全反射级次会导致光栅出射一系列规律的衍射花样,造成上述干扰和危害.首先理论上针对透射式光栅(包括取样光栅和聚焦光栅)进行了相应的计算和分析,然后从实验上观察并测量了取样光栅内部全反射级次的现象,并且结合镀减反膜前后的衍射现象进行了讨论,最后分析并给出了如何消除或规避全反射级次和其他冗余级次影响的方法.
    • 摘要: 岩石物理学研究红外线光谱的应用(根据国外发表的资料)利用傅里叶变换研究红外线光谱的物理原理。根据透光性、全内反射和漫反射图解介绍光谱图的记录方法。介绍在矿山岩石物理学研究过程中对岩石样本、黏土质页岩等进行红外线光谱和红外线光谱图特点进行的分析。
    • 何开岩; 李正良; 陈名贤; 钟水库; 陈子乾; 曾威; 孙备; 何鹏
    • 摘要: 为了改善用于建筑导光的镀膜反射类型的太阳能聚光器的性能,提出一种由透明实体整体成型的全内反射顺向聚光器,该聚光器具有结构紧凑、无需镀膜的特点。论文介绍了聚光器的结构和聚光传光原理。通过建立三维实体模型,应用光学分析软件模拟分析了聚光器的光学传输率,得出在不同入射光偏角时的传输率变化曲线。结果表明,该聚光器具有较大的跟踪容差性能,当平行入射光线偏角为1.4º时,传输率相对于正入射时下降不到20%;偏角为2.2º时,传输率仍然可以达到正入射时传输效率的60.8%;偏角为3º时,传输率还可达到正入射时传输率的50%,即3º为半传输率对应的偏角。因此,以这种结构为基础模块,结合导光光纤,采用空间多方位排列方式,可组成免跟踪系统的固定导光系统。%In order to improve the performance of the collector with reflective coating that used in building light guide, a forward-reflecting collector that is made from solid transparent material is pro-posed. It is characterized by a compact structure, no reflective coating. The structure and light con-centration and transmitting principle of the collector are introduced. Its 3-D model is made and its optical transmitting rate is simulated by light analysis software. By doing so, the graph of variation of transmitting rate with deflective angle is gained. The result shows that the proposed collector has a good tolerance performance. When parallel incident rays have a deflective angle of 1. 4o, the attenu-ation of the transmitting rate is less than 20% relative to that in normal incidence. In 2. 2oof deflec-tive angle, the transmitting rate remains 60. 8% of that in normal incidence. When in deflective an-gle of 3o, the transmitting rate is still not less 50%. 3o is the deflective angle for half rate. Based on this collector, connected by light fiber and arranged in a multiple direction in the space, a fixed light guide system without tracing system can be made.
    • 赵乔; 逯丹凤; 刘德龙; 陈晨; 胡德波; 祁志美
    • 摘要: Two types of Surface Enhanced Raman Scattering (SERS) substrates were prepared by self-assembly of gold nanoparticle (GNP) monolayers film on either bare glass substrates (glass/GNP) or glass substrates with a 30 nm thick gold film (glass/Au/GNP). SERS spectra of dye molecules adsorbed on the two substrates were obtained by total internal reflection (TIR) of an excitation laser beam combined with col ection of the air-side signal. The experimental results demonstrated that the signal enhancement factors of the two SERS substrates greatly depend on the polarization state of the excitation beam. In the case of the glass/GNP substrate, the signal enhancement factor obtained with the s-polarization TIR is two to five times as higher as that observed with the p-polarization TIR, indicating the formation of“hot spots”between adjacent particles in the GNP monolayer. With the glass/Au/GNP substrate, the SERS signal can be excited only by p-polarization TIR at a specific reflection angle, and the air-side SERS signal is almost 30 times that obtained with the glass/GNP substrate. The findings suggest that significant field enhancement is induced by the coupling between propagating surface plasmon resonance (SPR) and the localized SPR within the glass/Au/GNP substrate. Using a linear polarizer, the air-side SERS signal was verified to be non-polarized, containing s and p components of almost equal intensities. Further investigations revealed that the glass/Au/GNP substrate al ows for directional emission of the SERS signal with the p-polarization state.%采用静电自组装技术分别在玻璃基片和30 nm厚的金膜表面固定一层金纳米粒子(GNP)制得两种表面增强拉曼散射(SERS)基底,然后通过棱镜全内反射(TIR)激励和背向收集模式分别测试了两种基底上吸附的染料单分子层SERS光谱。实验结果表明两种SERS基底的拉曼增强效果均高度依赖于入射激光的偏振状态,对于玻璃/纳米金SERS基底, s光全内反射导致的拉曼增强因子是线偏振光(p)光的2-5倍,说明该基底上的“热点”位于纳米金单层膜内相邻粒子之间;对于玻璃/金膜/纳米金SERS基底,只有采用p光在特定的全内反射角下才能激发SERS信号,而且测得的SERS信号比玻璃/纳米金基底增强了近30倍。究其原因是p光在金膜表面共振激发的传播表面等离子体与纳米金局域表面等离子体耦合,进而导致显著场增强。实验结果指出在背向收集模式下,由p光激发的SERS信号是非偏振光,包含强度几乎相等的s和p成分。利用玻璃/金膜/纳米金基底还实现了拉曼光定向发射和收集,测得的SERS信号是p光。
    • 摘要: 南开大学物理科学学院的一个研究组,近日利用全内反射下石墨烯对介质折射率异常敏感的光学现象,实现了超灵敏单细胞实时流动传感。这一成果可以使癌细胞在形成之初即被精确“光测”出来,将为癌症预防提供一条新途径。
    • 摘要: 我国科学家利用全内反射下石墨烯对介质折射率异常敏感的光学现象,实现了超灵敏单细胞实时流动传感。这一成果可以使癌细胞在形成之初即被精确“光测”出来,精度可达数千分之一。这一成果的应用或将为癌症预防提供一条新途径。
    • 孔凡磊; 齐继伟; 孙骞
    • 摘要: A new microano-fiber polarizer with high extinction ratio has been developed by using birefringent crystal as a substrate.The extinction ratios for the polarized light are measured for fibers with cores of various radii and various refractive indexes.When the refractive index of a microano-fiber is between the ordinary refractive index and the main unordinary refractive index of a birefringent crystal,and the angle between the microano-fiber and the optical axis of the birefringent crystal is big enough,the microano-fiber assembled on the birefringent crystal can beused as a fiber polarizer.The extinction ratio of a microano-fiber is regulated in small range by the diameter of the fiber and the angle between the microanofiber and the optical axis of the birefringent crystal.The maximal extinction ratio is 22.74 dB for a microano-fiber with a diameter of 4.2 μm.%给出了一种以双折射晶体为衬底,实现高消光比的微纳光纤起偏器的方法.利用双折射晶体为衬底,研究了在不同折射率和半径的微纳光纤中传播的光波的偏振特性.当采取的微纳光纤的折射率在双折射晶体的寻常光折射率和非寻常光主折射率之间,且光纤和晶体光轴夹角足够大时,可以实现在微纳光纤中起偏.改变微纳光纤半径以及光纤和双折射晶体光轴之间的夹角可以对消光比进行调控,半径越小,消光比越大;角度越大,消光比越大.对于半径为2.1tμm微纳光纤,最大的消光比为22.74 dB.
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