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It has been recently reported that elastic waves induced by nanosecond lightpulses can be used to drive nano-motion of micro-objects on frictional solidinterfaces, a challenging task for traditional techniques using tiny opticalforce. In this technique, the main physical quantities/parameters involved are:temporal width and energy of light pulses, thermal heating and cooling time,friction force and elastic waves. Despite a few experimental observations basedon micro-fiber systems, a microscopic theory, which reveals how thesequantities collaboratively enable motion of the micro-objects and derives whatthe underlying manipulation principles emerge, is absent. In this article, acomprehensive theoretical analysis--centralized around the above listedphysical quantities, and illuminated by a single-friction-point model inconjunction with numerical simulations--is established to pedagogically clarifythe physics. Our results reveal the two essential factors in this technique:(1) the use of short light pulses for rapid thermal expansion overwhelmingfriction resistance and (2) the timescale asymmetry in thermal heating andcooling for accumulating a net sliding distance. Moreover, we examine theeffects of spatially distributed friction beyond the single-friction-pointconsideration, and show "tug-of-war"-like friction stretching in the drivingprocess. Given these insights, we positively predict that thiselastic-wave-based manipulation principle could be directly translated tomicro/nano-scale optical waveguides on optical chips, and propose a practicaldesign. We wish that these results offer theoretical guidelines for ongoingefforts of optical manipulation on solid interfaces with light-induced elasticwaves.

Nanomotion of micro-objects driven by light-induced elastic waves on solid interfaces