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14 results on '"Niu, Xiao Yun"'

8. Resist Exposure Developing Simulation Study of SPPs Lithography

Author

郑宇 Zheng Yu, 杜惊雷 Du Jinglei, 牛晓云 Niu Xiao-yun, 王景全 Wang Jing-quan, and 李敏 Li Ming

Subjects
Materials science, Resist, Nanotechnology, Lithography, Atomic and Molecular Physics, and Optics, Next-generation lithography, Interference lithography
Abstract

Based on the models of thin-layer resist exposure and developing,the SPPs resist exposure model is established.Two kinds of resist of AZ1500 and AR3170 are chosen to simulate the process of exposure and developing,and the final profile of SPPs lithography is obtained.Some craft optimization conditions are also conclucled.The research results are for experiment and future work of SPPs lithography.

Published
2010

9. Analysis of waveguide structure for surface plasmon polariton interference

Author

Wang Jing-Quan, Fang Liang, Li Min, Liang Hui-Min, Niu Xiao-Yun, and Du Jinglei

Subjects
Waveguide (electromagnetism), High contrast, Materials science, Fabrication, Field (physics), business.industry, Finite-difference time-domain method, General Physics and Astronomy, Surface plasmon polariton, Key point, Optics, Interference (communication), Optoelectronics, business
Abstract

This paper describes a multi-reflected mode based on a narrow waveguide to enlarge the interferential area of surface plasmon polaritons (SPPs). A reasonable thickness of metal film is coated under the waveguide, the incident angle and the waveguide thickness are optimized in order to effectively increase interferential area. This is a key point for research into the Goos–Hanchen shift to optimize the waveguide thickness. Finally, the SPP interferential field is simulated with the finite-difference time-domain (FDTD) technique to prove the optimized results, and indicates that not only is the interferential area enlarged, but the high contrast is also maintained. Furthermore, the mode can fabricate some specific interferential patterns by adding some modulating techniques to the waveguide. So the mode has potential application in the fabrication of sub-wavelength patterns.

Published
2009

12. Near-Field Optical Transfer Function for Far-Field Super-Resolution Imaging

Author

Du Chunlei, Zhang Zhi-You, Li Min, Luo Xiangang, Guo Yong-kang, Du Jinglei, and Niu Xiao-Yun

Subjects
Physics, Superlens, business.industry, Physics::Optics, General Physics and Astronomy, Metamaterial, Near and far field, Surface plasmon polariton, Transfer function, Optics, Transmission (telecommunications), Negative refraction, Optical transfer function, business
Abstract

The far-field superlens based on surface plasmon polaritons (SPP) has shown great application potential, but it is difficult and time-consuming to reconstruct the far-field image. We derive a near-field optical transfer function (NOTF) of a silver slab and analyse its validity so that accurate information of nano-scale object in the near-field can be computed rapidly. The NOTF is helpful not only for analysing the super-resolution imaging process in far-field, but also for providing a track to describe the transmission of optical information from near-field to far-field by using the optical transfer functions theory only.

Published
2009

13. Soil microorganisms, nutrients and enzyme activity of Larix kaempferi plantation under different ages in mountainous region of eastern Liaoning Province, China.

Author

NIU Xiao-yun, SUN Xiao-mei, CHEN Dong-sheng, and ZHANG Shou-gong

Abstract

We studied the community of soil microorganisms, enzyme activity and soil nutrients under 11-, 20-, 34-and 47-year-old Larix kaempferi plantations in mountainous region of eastern Liaoning Province to discuss the soil biological properties of L. kaempferi plantations of different stand ages and their relationships with soil nutrients. The results showed that the indexes reflecting soil microorganisms, enzyme activity and soil nutrients of L. kaempferi plantations were the highest under the 11- or 47- year-old stand and the lowest in the 20- or 34-year-old stand. Soil productivity appeared in a decline trend with the increasing stand age, and the changes of soil microbial community structure and enzyme activity were responsive to soil degradation. The difference of fungi community was more noticeable than that of bacteria community among the plantations with different stand ages. The results of CCA showed soil nutrient and pH had no effect on seasonal difference of community structure, but had effects on community structure among different stand ages. The total N, organic carbon, C/ N, available nitrogen, exchangeable Mg2+ and pH had greater effects on bacteria community, while available P, total K and pH had greater effect on fungi community among different age forests. The main T-RFs of bacteria and fungi had higher correlation with N and P, and the fungi community had higher correlation with organic carbon and K than bacteria community. The microorganism community of the 11- and 47-year-old stands had greater correlation with soil nutrients and enzyme activity than that of 20- and 34-year-old stands. Consequently, soil organisms, in particular soil fungi, could be used to indicate soil degradation. [ABSTRACT FROM AUTHOR]

Published
2015

14. [Soil microorganisms, nutrients and enzyme activity of Larix kaempferi plantation under different ages in mountainous region of eastern Liaoning Province, China].

Author

Niu XY, Sun XM, Chen DS, and Zhang SG

Subjects
Bacteria, Carbon analysis, China, Fungi, Nitrogen analysis, Phosphorus analysis, Potassium analysis, Forests, Larix microbiology, Soil chemistry, Soil Microbiology
Abstract

We studied the community of soil microorganisms, enzyme activity and soil nutrients under 11-, 20-, 34-and 47-year-old Larix kaempferi plantations in mountainous region of eastern Liaoning Province to discuss the soil biological properties of L. kaempferi plantations of different stand ages and their relationships with soil nutrients. The results showed that the indexes reflecting soil micro-organisms, enzyme activity and soil nutrients of L. kaempferi plantations were the highest under the 11- or 47-year-old stand and the lowest in the 20- or 34-year-old stand. Soil productivity appeared in a decline trend with the increasing stand age, and the changes of soil microbial community structure and enzyme activity were responsive to soil degradation. The difference of fungi community was more noticeable than that of bacteria community among the plantations with different stand ages. The results of CCA showed soil nutrient and pH had no effect on seasonal difference of community structure, but had effects on community, structure among different stand ages. The total N, organic carbon, C/N, available nitrogen, exchangeable Mg2+ and pH had greater effects on bacteria community, while available P, total K and pH had greater effect on fungi community among different age forests. The main T-RFs of bacteria and fungi had higher correlation with N and P, and the fungi community had higher correlation with organic carbon and K than bacteria community. The microor-ganism community of the 11- and 47-year-old stands had greater correlation with soil nutrients and enzyme activity than that of 20- and 34-year-old stands. Consequently, soil organisms, in particular soil fungi, could be used to indicate soil degradation.

Published
2015

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