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Effect of Initialization Technical Parameters on optical Absorption of Ge_2Sb_2Te_5 Thin Films

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Journal of Materials Science & Technology 2004年第5期20卷 509-511页

作者： Ming FANG, Qinghui LI and Fuxi GANShanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China Inst. of Optics and Fine Mech. Chinese Acad. of Sci. Shanghai 201800 China

The optical absorption properties of phase-change optical recording thin films subjected to various initialization conditions were investigated. The effects of initialization power and velocity on optical constants of the Ge2Sb2Te5 thin films were also studied. The energy gap of Ge2Sb2Te5 thin films subjected to various initialization conditions was also obtained. It was found that the optical energy gap of the Ge2Sb2Te5 thin films increased with either increasing initialization laser power or decreasing initialization velocity, with peak of 0.908 eV at laser power of 1000 mW or initialization velocity of 4.0 m/s, but the continued increasing initialization laser power or decreasing initialization velocity resulted in the decrease of the optical energy gap. The change of the optical energy gap was discussed on the basis of amorphous crystalline transformation.

关键词： Phase transformation optical recording Ge2Sb2Te5 optical absorption Energy gap

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Three-dimensional optical storage in fused silica using modulated femtosecond pulses

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Chinese Optics Letters 2004年第5期2卷 292-294页

作者：刘青程光华王屹山程昭赵卫陈国夫 State Key Laboratory of Transient Optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068 College of Physics & Electrical Information Ningxia University Yinchuan 750021 State Key Laboratory of Transient Optics and Technology Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'an 710068

Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a Ti:sapphire femtosecond laser modulated by binary digits is demonstrated. Laser pulses modulation is realized by modulating two circuits of trigger pulses signal which are used to control laser pulses trapping and switching out from cavity, respectively. Bits are optically readout in both a parallel reading (phase-contrast) and a serial reading (confocal-type) methods. The method for modulating laser pulses can also be used in all of pulsed laser systems which operate in cavity-dumping configuration.

关键词： Fused silica Laser pulses optical recording Pulse modulation Sapphire Three dimensional

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Effects of oxygen partial pressure on optical properties of NiO_x films deposited by reactive DC-magnetron sputtering

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Chinese Optics Letters 2006年第11期4卷 678-681页

作者：周莹耿永友顾冬红 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 Graduate School of the Chinese Academy of Sciences Beijing 100039 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800

The influence of oxygen partial pressure on the optical properties of NiOx thin films deposited by reactive DC-magnetron sputtering from a nickel metal target in a mixture gas of oxygen and argon was presented. With the oxygen ratio increasing, the reflectivity of the as-deposited films decreased, and optical band gap increased. Thermogravimetric analysis （TGA） showed that the decompose temperature of the films was above 250℃. After annealed at 400℃, only films deposited at 5% O2/Ar ratio showed high optical contrast which was about 52%. Scanning electron microscope （SEM） results revealed that the changes of surface morphology were responsible for the optical property variations of the films after annealing. Its thermal stability and high optical contrast before and after annealing made it a good potential write-once optical recording medium. OCIS codes： 310.6860, 310.3840, 210.4810, 300.6470.

关键词： Annealing Magnetron sputtering Morphology optical properties optical recording Partial pressure Reflection Scanning electron microscopy Thermodynamic stability Thermogravimetric analysis Thin films

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Transformation of metallic photonic structures from nano-hole to nano-island arrays through annealing process

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Chinese Optics Letters 2012年第B6期10卷 190-192页

作者：刘红梅庞兆广翟天瑞张新平 College of Applied Sciences Beijing University of Technology Beijing 100124 China College of Physics Science and Information Engineering Hebei Normal University Shijiazhuang 050024 China

Large-area metallic photonic crystals （MPCs） consist of two-dimensional （2D） periodical arrays of gold nano-holes are fabricated by solution-processible gold nanoparticles using interference lithography in com- bination with subsequent lift-off and annealing processes. By controlling the annealing temperature, the 2D nano-hole arrays are transformed into nano-island arrays, enabling easy achievements of two different photonic devices. The microscopic characterization shows convincingly the success of tile fabrication tech- niques and verifies our proposed mechanisms for this kind of nanoscale morphology transformation. This kind of mechanisms can be applied extensively in the metallic nanofabrication and in the realization of plasmonic photonic devices.

关键词： 250.0250 Optoelectronics 100.6640 Superresolution 210.4770 optical recording 180.1790 Confocal microscopy

Lidar ratio of Asian haze and pollution episodes observed by using a Raman/elastic lidar

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Chinese Optics Letters 2012年第B6期10卷 1-4页

作者：陈臻懿刘文清张玉钧 Birgit Heese Key Laboratory of Environmental Optics and Technology Anhui Insititute of Optics and Fine Mechanics Hefei 230031 China Institute of Tropospheric Research Leipzig Germany

A combined Raman/elastic backscatter lidar observations is carried out in the Pearl River Delta （PRD） China. The results show the largest lidar ratios of the order of 80 sr in the uplifting boundary layer in 2-3 km during the haze period. In the moderate pollution period, the lidar ratio has an average value of 58 sr. The Angstrom exponent exhibits high values around 1.82, indicating the presence of rather small particles. Different back air mass trajectories and the ambient atmospheric conditions are attributed to the distinct characteristics of aerosol optical properties in the haze and moderate pollution episodes. In the lower layer in the haze period, air masses are mostly advected from southeast coast China. In contrast, the air mass in the moderate pollution observing period passes through northwest China, indicating the combination of some pollution from the Tarim Basin in case of strong convection and the smoke from adjacent fire burning spot in PRD region.

关键词： 210.4770 optical recording 180.1790 Confocal microscopy

Research on the molecular mechanisms of acute DHEAS application primed the induction of long-term potentiation inductions

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Research on the molecular mechanisms of acute DHEAS applicat...