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Investigation on the interaction length and access resistance of a nanopore with an atomic force microscopy

Science China(Technological Sciences) 2017年第4期60卷 552-560页

作者： SI Wei YANG HaoJie LI Kun WU GenSheng ZHANG Yin KAN YaJing XIE Xiao SHA JingJie LIU Lei CHEN YunFei Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments and School of Mechanical Engineering Southeast University Nanjing 210096 China Key Laboratory of MEMS of Ministry of Education Southeast University Nanjing 210096 China

Nanopore devices have attracted a lot of attention for their potential application in DNA sequencing. Here, we study how an occluding object placed near a nanopore affects its access resistance by integrating an atomic force microscopy with a nanopore sensor. It is found that there exists a critical hemisphere around the nanopore, inside which the tip of an atomic force microscopy will affect the ionic current. The radius of this hemisphere, which is a bit smaller than the theoretical capture radius of ions, increases linearly with the applied bias voltage and quadratically with the nanopore diameter, but is independent of the operation modes and scanning speeds of the atomic force microscopy. A theoretical model is also proposed to describe how the tip position and geometrical parameters affect the access resistance.

关键词： solid-state nanopore ionic current access resistance interaction length AFM capture radius

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Scaling of interaction lengths for hypersonic shock wave/turbulent boundary layer interactions

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Chinese Journal of Aeronautics 2021年第5期34卷 504-509页

作者： Yuting HONG Zhufei LI Jiming YANG Department of Modern Mechanics University of Science and Technology of ChinaHefei 230027China

The interaction length induced by Shock Wave/Turbulent Boundary-Layer interactions(SWTBLIs)in the hypersonic flow was investigated using a scaling analysis,in which the interaction length normalized by the displacement thickness of boundary layer was correlated with a corrected non-dimensional separation criterion across the interaction after accounting for the wall temperature effects.A large number of hypersonic SWTBLIs were compiled to examine the scaling analysis over a wide range of Mach numbers,Reynolds numbers,and wall *** results indicate that the hypersonic SWTBLIs with low Reynolds numbers collapse on the supersonic SWTBLIs,while the hypersonic cases with high Reynolds numbers show a more rapid growth of the interaction length than that with low Reynolds ***,two scaling relationships are identified according to different Reynolds numbers for the hypersonic *** scaling analysis provides valuable guidelines for engineering prediction of the interaction length,and thus,enriches the knowledge of hypersonic SWTBLIs.

关键词： Hypersonic flow interaction length Scaling laws Separation criterion Shock wave/turbulent boundary layer interactions

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Electromagnetically induced grating realization in phaseonium

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Communications in Theoretical Physics 2023年第8期75卷 150-155页

作者： Fazal Badshah Muqaddar Abbas Sobia Asghar Jin Xie Rahmatullah School of Electrical and Information Engineering Hubei University of Automotive TechnologyShiyan 442000China Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic DevicesSchool of PhysicsXi'an Jiaotong UniversityXi'an 710049China Quantum optics Lab.Department of Physics COMSATS University IslamabadIslamabadPakistan

We propose a method to implement electromagnetically induced grating in a phaseonium medium that has been coherently generated via atomic *** atoms have aΛ-type structure and three distinct energy levels;such atoms are originally generated in a coherent superposition of two lower *** phaseonium system is comprised of three-level atoms with aΛ-type configuration,which are initially prepared in a coherent superposition of two lower *** accomplish this spatial modulation based on the susceptibility of phaseonium medium,a standingwave field is *** looking at how an optical field diffracts at different relative phases,we find that the zeroth and first order diffraction intensities increase as the relative phase *** also investigate the impact of the Rabi frequency of the field on diffraction intensity and notice that an increasing strength of the Rabi frequency leads to amplification in the intensity of both central zeroth order and first-order ***,it has been observed that a significant rise in diffraction intensity occurs at longer interaction lengths between external fields and the atomic medium.

关键词： electromagnetically induced grating phaseonium diffraction order interaction length

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