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Magnetic plasmon mode resonance and power transmission in a nanosandwich waveguide

Chinese Physics B 2011年第8期20卷 358-362页

作者：付非亚周文君刘安金陈微王宇飞晏新宇郑婉华 Nano-optoelectronics Laboratory Institute of SemiconductorsChinese Academy of Sciences State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences

The magnetic plasmon （MP） modes in the metal-dielectric-metal nanosandwich structure are investigated nu- merically, and the principle of energy resonance in such a resonator is proposed. An equivalent inductance capacitance circuit analysis method is proposed and the results are in agreement with the numerical simulations. Based on the MP resonance in such a structure, a nanosandwich chain waveguide is designed. Gold and silver are chosen as the metal materials. The power transmission e^ciency of the nanosandwieh waveguide can be as high as 0.546 in a specific nanosandwich unit cell, even when the metal absorption loss is large, which is the perspective of the new waveguides and lasers based on MP modes.

关键词： nanosandwich magnetic plasmon modes magnetic resonance waveguide

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Molecular behaviors in thin film lubrication——Part two: Direct observation of the molecular orientation near the solid surface

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Friction 2019年第5期7卷 479-488页

作者： Ming GAO Haoyu LI Liran MA Yuan GAO Linwei MA Jianbin LUO State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China School of Metallurgy Engineering Xi’an University of Architecture and TechnologyXi’an710055China School of Materials Science and Engineering Tsinghua UniversityBeijing100084China

Over the past twenty years, thin film lubrication(TFL) theory has been used to characterize the molecular behaviors in lubrication films thinner than 100 nm, effectively bridging the gap between elastohydrodynamic lubrication and boundary lubrication. Unfortunately, to date, the TFL molecular model proposed in 1996 has not been directly proven by experimental detection. Herein, a method based on surface-enhanced Raman spectroscopy was developed to show both the packing and orienting of liquid molecules in the TFL regime. By trapping liquid crystal molecules between a structured silver surface and a glass surface, molecular ordering states dominated by shear effect and surface effect were successfully distinguished. A nanosandwich structure consisting of an adsorbed layer, an ordered-molecule layer, and a fluid layer was demonstrated. Molecule imaging in TFL was achieved. Our results illustrate the molecular behaviors and lubrication mechanism in nanoconfined films and facilitate the lubrication design of nanoelectromechanical and microelectromechanical systems.

关键词： thin film lubrication molecular behaviors nematic liquid crystal surface-enhanced Raman spectroscopy lubrication theory nanosandwich structure

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Quantum Conductance Staircase of Edge Hole Channels in Silicon Quantum Wells

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Journal of Modern Physics 2012年第11期3卷 1771-1775页

作者： Nikolay T. Bagraev Leonid E. Klyachkin Andrei A. Kudryavtsev Anna M. Malyarenko Ioffe Physical Technical Institute St. Petersburg Russia

We present the findings for the quantum conductance staircase of holes that is caused by the edge channels in the ultra-shallow p-type silicon quantum well (Si-QW), 2 nm, confined by the δ-barriers heavily doped with boron on the n-type Si (100) surface. This longitudinal quantum conductance staircase, Gxx, is revealed by the voltage applied to the Hall contacts, Vxy, to a maximum of 4e2/h. In addition to the standard plateau, 2e2/h, the variations of the Vxy voltage appear to exhibit the fractional forms of the quantum conductance staircase with the plateaus and steps that bring into correlation respectively with the odd and even fractional values.

关键词： Quantum Conductance Staircase Edge Channels Silicon nanosandwich Odd and Even Fractional Values

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