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The ability to manipulate microparticles or nanoparticles precisely is important for the development of microsystem. Acoustic tweezers are excellent tools for manipulating particles with size approaching or slightly smaller than wavelength. However, manipulation of microparticles with much smaller size requires stronger acoustic confinement and higher intensities than can be provided by these diffraction-limited...
We theoretically and experimentally investigate the acoustic radiation force (ARF) on cylindrical steel particle near subwavelength slits. By using finite-difference-time-domain (FDTD) method combined with momentum-flux tensor, the dependence of the ARF on the frequency, width of slit are analyzed, respectively. It is predicted that the particle near the slit surface could suffer a trapping effect...
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