常温和0.1～1 400 MPa条件下黄铜矿的拉曼光谱研究

实验利用金刚石压腔装置研究了常温和0.1～1 400 MPa范围内黄铜矿A₁振动模式的原位拉曼光谱特征。结果显示在实验条件范围内,该拉曼振动峰的强度和形态保持稳定,表明晶格内Cu-S和Fe-S间的相互作用没有发生质变。实验发现黄铜矿该拉曼振动的波数随着压力升高连续向高频方向移动,两者的线性关系为：ν₂₉₀＝0.031 2p+290.60(0.1≤p<58.8 MPa)和ν₂₉₀＝0.005 72p+292.10(58.8≤p<1 400 MPa)dν/dp。常温下58.8 MPa是黄铜矿该拉曼波数随压力变化率的一个突变点,低于和高于该压力时分别为31.2和5.72 cm-1·GPa-1,显著的差异表明黄铜矿的结构可能发生了某种改变。     

Optical phase front control in a metallic grating with equally spaced alternately tapered slits

A technique capable of focusing and bending electromagnetic （EM） waves through plasmonic gratings with equally spaced alternately tapered slits has been introduced. Phase resonances are observed in the optical response of transmission gratings, and the EM wave passes through the tuning slits in the form of surface plasmon polaritons （SPPs） and obtains the required phase retardation to focus at the focal plane. The bending effect is achieved by constructing an asymmetric phase front which results from the tapered slits and gradient refractive index （GRIN） distribution of the dielectric material. Rigorous electromagnetic analysis by using the two-dimensional （2D） finite difference time domain （FDTD） method is employed to verify our proposed designs. When the EM waves are incident at an angle on the optical axis, the beam splitting effect can also be achieved. These index-modulated slits are demonstrated to have unique advantages in beam manipulation compared with the width-modulated ones. In combination with previous studies, it is expected that our results could lead to the realization of ootimum designs for plasmonic nanolenses.     

激光惯性约束聚变中光学汤姆逊散射研究进展

当前,激光惯性约束聚变在越来越接近点火的极端能量密度条件下,实验与模拟的偏离逐渐增大,一个关键原因是缺乏对黑腔等离子体状态及其影响黑腔能量学和内爆对称性的细致研究和判断。光学汤姆逊散射主动式、诊断精确、参数完备的优点,使之成为激光惯性约束聚变黑腔等离子体状态参数精密诊断的标准方法。中国面向激光惯性约束聚变研究的光学汤姆逊散射实验技术的发展与神光系列激光装置的建设和在其上开展的物理实验紧密相关。近年来,四倍频汤姆逊散射实验技术在神光III原型和100 kJ激光装置上相继建立,部分实验结果不仅加深了对激光惯性约束聚变靶物理的认识,还反映了实验条件对汤姆逊散射诊断的影响,促进了实验技术的精密化发展。在未来,还需要进一步发展多支路汤姆逊散射、五倍频汤姆逊散射和超热相干汤姆逊散射等新技术,面向点火黑腔条件,大幅提升激光等离子体状态参数的诊断精度,开展新物理机制的探索和研究,在激光惯性约束聚变和其他高能量密度物理科学领域发挥更重要的作用。     

Retinal axial focusing and multi-layer imaging with a liquid crystal adaptive optics camera

With the help of adaptive optics(AO) technology, cellular level imaging of living human retina can be achieved.Aiming to reduce distressing feelings and to avoid potential drug induced diseases, we attempted to image retina with dilated pupil and froze accommodation without drugs. An optimized liquid crystal adaptive optics camera was adopted for retinal imaging. A novel eye stared system was used for stimulating accommodation and fixating imaging area. Illumination sources and imaging camera kept linkage for focusing and imaging different layers. Four subjects with diverse degree of myopia were imaged. Based on the optical properties of the human eye, the eye stared system reduced the defocus to less than the typical ocular depth of focus. In this way, the illumination light can be projected on certain retina layer precisely.Since that the defocus had been compensated by the eye stared system, the adopted 512 × 512 liquid crystal spatial light modulator(LC-SLM) corrector provided the crucial spatial fidelity to fully compensate high-order aberrations. The Strehl ratio of a subject with-8 diopter myopia was improved to 0.78, which was nearly close to diffraction-limited imaging. By finely adjusting the axial displacement of illumination sources and imaging camera, cone photoreceptors, blood vessels and nerve fiber layer were clearly imaged successfully.     

氟化物、氟磷酸盐和磷酸盐玻璃中Er3+离子的发光研究

测定了氟化物、氟磷酸盐和磷酸盐玻璃中Er³⁺离子的吸收、荧光和激发光谱,解释了基质玻璃对Er³⁺离子发光的影响。进一步研究了在这三种基质玻璃中Er³⁺离子发光的浓度效应和温度效应,讨论了Er³⁺离子内和离子间的能量转移过程。 关键词：     

SU(4)磁单极子与双子解

以SU(4)规范群为例,提出一个简单求解磁单极子及双子的经典解的方法,它可系统地推广于一般的SU(N)群的情况.所得到的SU(4)单磁荷为■     

红外焦平面技术的重要进展—单片式SiGe红外焦平面阵列的物理基础和关键技

由ＳｉＧｅ合金与Ｓｉ构成的应变层异质结构、量子阱是８０年代中期发展起来的一种新型半导体材料。本文着重讨论了单片式ＳｉＧｅ红外焦平面阵列的物理基础、高质量ＳｉＧｅ材料的制备以及低温ＳｉＧｅ器件研制中的几个关键技术。     

北京谱仪端盖簇射计数器的建造与检测

描述了北京谱仪端盖簇射计数器的结构及制造工艺.并给出丝张力,暗电流、计数管工作特性等检测结果.     

低温强磁场下Si MOS反型层输运特性的研究

制备了4.2K下电子迁移率达1～2×10~4cm~2/v·sec的MOS反型层,在强磁场下观察到二维电子系统的一系列典型物理现象:SdH振荡及量子霍尔效应.     

光纤布拉格光栅传感器应变传递双向耦合分析

粘贴于受弯基体表面的光纤布拉格光栅传感器测量应变与基体真实应变之间存在误差,因此研究光纤布拉格光栅传感器的变形机理、分析测量应变与真实应变之间的关系是目前的研究热点.首先研究光纤布拉格光栅传感器与基体之间的相互作用机理,然后,利用有限元解、实验值和理论解进行对比验证,并分析产生误差的原因.最后,通过参数分析研究弹性模量、厚度、粘结长度等参数对光纤布拉格光栅传感器测量效果的影响.结果表明有限元解、实验值和理论解具有相同的变化趋势,有限元解与理论解的误差在2%以内,测量值与理论解的误差在7%以内.平均应变传递率随着基体弹性模量的增大、粘结长度的增长而逐渐增大,随粘结层弹性模量的减小、粘结层厚度的增大而逐渐减小.该理论对应用于受弯基体应变测量的光纤布拉格光栅传感器的设计具有一定的指导意义.