共查询到20条相似文献,搜索用时 875 毫秒
2.
本文阐述了光子学和光电子产业的发展与现状,指出光子技术和光子产业在促进科学技术和国民经济发展中的重要作用。我们要抓住机遇发展我国的“光谷”,加速发展我国的光电子产业。 相似文献
3.
4.
5.
6.
7.
激光全息光刻技术在微纳光子结构制备中的应用进展 总被引:1,自引:0,他引:1
微纳光子结构研究随着光子学、半导体物理学及微加工技术的发展而逐渐蓬勃开展,并在其结构、理论、制备技术等方面取得了系列进展。受限于目前的微加工技术水平,要成功制备大尺度、高质量的光子材料仍然存在着一定挑战。激光全息光刻技术作为一种简便快捷的微结构制作技术已经发展成为一种经济快速制作大面积微纳超材料及光子晶体模板的重要手段。介绍了激光全息光刻技术的原理,详细阐述了该技术在制作三维面心立方、木堆积结构、金刚石结构光子晶体以及光学周期类准晶、手性超材料、周期性缺陷结构等微纳光子结构中的应用研究进展。激光全息光刻技术成功制作微纳光子结构为光子材料在更多领域的广泛应用提供了基础和方法。 相似文献
8.
光子晶体光纤及其应用 总被引:3,自引:1,他引:2
光子晶体作为一种新兴的材料 ,将会对整个光子学和光子产业领域产生深远的影响 ,而其最重要的应用之一———光子晶体光纤已经在很多科研技术领域得到了应用 .文章综述了光子晶体光纤的研究进展 ,给出其分类 ,并重点介绍了光子晶体光纤在超短脉冲、光频测量、光纤通信等科研领域的重要应用以及未来的发展前景 相似文献
9.
从光子晶体概念的提出到现在已经过了20余年,光子晶体不仅成为微纳光子学和量子光学的重要研究领域,而且在信息光学以及其他多个学科中得到广泛应用.本文重点综述了光子晶体的制备工艺,尤其是二维光子晶体和三维光子晶体的制备工艺进展,同时也综述了光子晶体的应用研究的进展,在此基础上,提出了一些光子晶体研究的展望. 相似文献
10.
11.
微光图象光子计数器象管光子增益测试研究 总被引:1,自引:0,他引:1
本文介绍了微光图象光子计数器象管的主要构成及其与常规二代微光象增强器的区别.在论述单通道光子计数技术原理的基础上,提出了微光图象光子计数器象管的主要参数-光子增益的测试原理和方法,建立了测试系统.对微光图象光子计数器象管的光子增益进行了实测,并将测试结果与常规二代微光象增强器的亮度增益进行了比较,给出了光子增益的估算公式. 相似文献
12.
S. Grossmann H. Kümmel P. H. Richter 《Applied Physics A: Materials Science & Processing》1973,1(5):257-261
Static photon intensities and correlations, intensity linewidths, and transient behaviour of a two-mode laser near and between
the modes' thresholds have been calculated as functions of external pumping, of the coupling strength between the modes, and
of detuning. Several curves, summarizing our results, are reported and discussed. 相似文献
13.
K.V. Deshmukh D.C. Haworth 《Journal of Quantitative Spectroscopy & Radiative Transfer》2008,109(14):2391-2400
An important issue in chemically reacting turbulent flows is the interaction between turbulence and radiation (TRI), which arises from highly nonlinear coupling between fluctuations in temperature and species composition of the flow field with the fluctuations of radiative intensity. Here direct numerical simulation (DNS) has been employed to investigate TRI in canonical nonpremixed systems in three-dimensional geometries. A photon Monte Carlo method has been used to solve the radiative transfer equation (RTE), which has been coupled with the flow solver. Radiation properties employed here correspond to a nonscattering fictitious gray gas with a Planck-mean absorption coefficient, which mimics that of typical hydrocarbon-air combustion products. Individual contributions of emission and absorption TRI have been isolated and quantified. The temperature self-correlation, the absorption coefficient-Planck function correlation, and the absorption coefficient-intensity correlation have been examined for intermediate-to-large values of the optical thickness, and contributions from all three correlations were found significant but the relative importance of their contribution varies with optical thickness. 相似文献
14.
MnSi is a ferromagnetic compound with a Curie temperature of 29 K. Recent theoretical studies predict that 2 ML of MnSi epitaxially grown on Si show a ferromagnetic metallic ground state with spin polarization of about 50%. This would allow the development of spintronic devices based on the injection of spin-polarized current from a ferromagnetic metal into a semiconductor.In this context the possibility of growing in situ MnSi on the Si(1 1 1) surface has been explored. Thermal reaction, crystalline structure and electronic properties of the grown films have been studied in situ by photoemission spectroscopy (PES), X-ray absorption spectroscopy (XAS), and low energy electron diffraction (LEED). Depositing a thin film of Mn on Si(1 1 1) the formation of ordered islands (with dimensions dependent on the amount of deposited Mn) is driven by annealing at selected temperatures, as already observed. Our preliminary studies show that by simultaneously depositing Mn and Si in 1:1 stoichiometry on Si(1 1 1) a large improvement in the homogeneity of the MnSi films is achieved. 相似文献
15.
Shamsan S. Obaid M. I. Sayyed D. K. Gaikwad H. O. Tekin Y. Elmahroug P. P. Pawar 《辐射效应与固体损伤》2013,168(11-12):900-914
ABSTRACTThe photon attenuation coefficients for the rocks (Feldspathic basalt, Compact basalt, Volcanic rock, Pink granite, Sandstone and Dolerite) have been investigated using MCNPX and Geant4 codes for photon energies 122, 356, 511, 662, 1170, 1275 and 1330 keV. Comparison of the simulation and experimental results of mass attenuation coefficients is presented. The exposure buildup factors also have been calculated with the help of the G-P fitting method. The comparison showed reasonable agreement between the simulated and experimental data for all rocks. The results show that sandstone has the highest mean free path as well as exposure buildup factor which signifies that sandstone requires a larger thickness for protection from photons. 相似文献
16.
We have studied micro-photoluminescence spectra of a self-assembled single GaAs quantum dot under 8 K. With strong pulsed excitation, the micro-photoluminescence spectrum shows bright emission lines originated from an exciton, a positively charged exciton, and a biexciton, together with weak lower energy emissions reflecting multi-excitonic structures with more carriers. We have identified the origins of these weak emission lines, and showed the existence of charged biexciton states, through single photon correlation measurements and excitation power dependence of the photoluminescence intensity. In addition, investigating the radiative recombination process of the charged biexciton, we have determined the electron–hole exchange energy in the GaAs quantum dot. 相似文献
17.
Summary A previously proposed one-electron model for photoionization, referred to as extended asymptotic model [J. Mol. Struct. (Teochem)
166, 369 (1988)], is further developed to cope with two-photon ionization processes. A simple application of the approach to
the case of the negative ion H− is investigated and discussed.
The authors of this paper have agreed to not receive the proofs for correction. 相似文献
18.
A. Gozzini F. Mango J. H. Xu G. Alzetta F. Maccarrone R. A. Bernheim 《Il Nuovo Cimento D》1993,15(5):709-722
Summary An intense laser-induced fluorescence of sodium and of other alkali atoms (K, Rb) at room and lower temperatures has been
observed in polysiloxanecoated cells, producing a vapor density of the metal which is much higher than that corresponding
to the thermal equilibrium between the vapor and the condensed phase. This enhancement is attributed to the light-induced
ejection of atoms absorbed by the polysiloxane coating. The atomic density of the vapor can be manipulated by changing either
the laser power or frequency. The dependence of the atomic density on these and other parameters as well as its time-dependent
behavior are studied experimentally. A tentative interpretation of the phenomenon is discussed in terms of the properties
of solutions of the alkali metals in several solvents. 相似文献
19.
M. H. Elghazaly 《Journal of Quantitative Spectroscopy & Radiative Transfer》2005,90(3-4):389-398
The mean probability of photon capture Ψ, obtained via an approximation to the complementary escape factor Λ, for calcium and zinc resonance lines at 4226.73 and 2138.56 Å have been determined from their atomic absorption measurements. Calculations are performed for Gaussian, Lorentzian, and Voigt spectral line shapes. Tabulations and graphical plots of the mean probability of photon capture, Ψ, with the optical depth in the center of Doppler profile, τD, and the number density of free atoms in the ground state N, are provided. 相似文献