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Many typical nanoscale structures consist of dielectric nanoparticles with aninevitable oxide-generated coating around them. Depending on the fabricationtechniques, these coatings may not be homogeneous, and their distortion cancause problems in the applications of such systems. Based on finite elementsimulations, inhomogeneous core-shell nanoparticle systems are numericallystudied when illuminated with two counter-propagating plane waves in theoptical range. It is found that the electromagnetic field distortions caused bythe inhomogeneous system under Mie resonance conditions allow the system toexhibit controllable one-directional impulsion and rotation, which mainlydepends on the offset between the core and shell. The overall geometry andcomposition of the system also dictate the type of resonance being excited.Overall, this "photonic thruster" effect consisting of an accelerating andspinning projectile would provide stability to particle movement andadditionally establish a method to distinguish inhomogeneous from homogeneousparticles. The method can be scaled to a wide range of nanoscale dielectricparticles. Thus, the results are useful for detecting defects in nanosystemswith a simple concept and may open avenues for improving nanoparticle synthesismethods.

Control and sorting of eccentric all-dielectric core-shell nanoparticles using two counter-propagating plane waves