Ai Qun Liu

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  • Wei Ming Zhu, Ai Qun Liu, +9 authors Dim Lee Kwong
  • 2011
Metamaterials have attracted intensive research interest in recent years because their optical properties have a strong dependence on the geometry of metamaterial molecules rather than the material composition. [ 1–3 ] This feature has inspired the creation and tailoring of exotic properties, such as a negative refractive index, [ 4 , 5 ] perfect(More)
Comb drives inherently suffer from electromechanical instability called lateral pull-in, side pull-in or, sometimes, lateral instability. Although fabricated to be perfectly symmetrical, the actuator's comb structure is always unbalanced, causing adjacent finger electrodes to contact each other when voltage–deflection conditions are favorable. Lateral(More)
Among the microfluidic separation methods, hydrodynamic spreading is a simple and high-throughput continuous separation technique based on the difference in size. However, it is difficult to adjust tiny pressure differences accurately in microfluidic devices. In this study, a combination of electroosmotic flow (EOF) and hydrodynamic flow spreading was(More)
Applications of surface plasmon polaritons [ 1 ] (SPP) have been extensively developed in the fi eld of optoelectronics, such as plasmonic circuitry (e.g., waveguides, interferometric logic, and modulators), [ 2 ] nanolasers, [ 3 ] ultrahigh-effi ciency sensors, [ 4 ] photovoltaics, [ 5 ] super-resolution imaging, [ 6 ] and various two-dimensional plasmonic(More)
The past decade has seen a number of interesting designs proposed and implemented to generate artificial magnetism at optical frequencies using plasmonic metamaterials, but owing to the planar configurations of typically fabricated metamolecules that make up the metamaterials, the magnetic response is mainly driven by the electric field of the incident(More)
There are some missing grant numbers in the funding statement for this article. Please refer to the correct funding statement below: China (General Program). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Copyright: ß 2014 The PLOS ONE Staff. This is an open-access article(More)
Vertical split-ring resonators (VSRRs) were fabricated which behave as magnetic metamolecules sensitive to both incident electric and magnetic fields with the stronger induced magnetic dipole moments upon excitation in comparison to planar SRRs. Using these metamolecules with different spacing in VSRR dimers, we investigate the hybridization of the magnetic(More)