Light is a precious resource that nature has given to human beings.Converting green,recyclable light energy into the mechanical energy of a micromotor is undoubtedly an exciting challenge.However,the performance of cu...Light is a precious resource that nature has given to human beings.Converting green,recyclable light energy into the mechanical energy of a micromotor is undoubtedly an exciting challenge.However,the performance of current light-induced micromotor devices is unsatisfactory,as the light-to-work conversion efficiency is only10-15–10-12.In this paper,we propose and demonstrate a laser-induced rotary micromotor operated byΔα-type photopheresis in pure liquid glycerol,whose energy conversion ratio reaches as high as 10-9,which is 3–6 orders of magnitude higher than that of previous light-induced micromotor devices.In addition,we operate the micromotor neither with a light field carrying angular momentum nor with a rotor with a special rotating symmetrical shape.We just employ an annular-core fiber to configure a conical-shaped light field and select a piece of graphite sheet(with an irregular shape)as the micro-rotor.TheΔα-type photophoretic force introduced by the conicalshaped light field drives the rotation of the graphite sheet.We achieve a rotation rate up to 818.2 r/min,which can be controlled by tuning the incident laser power.This optical rotary micromotor is available for twisting macromolecules or generating vortex and shear force in a medium at the nanoscale.展开更多
基金National Key R&D Program of China(2018YFC1503703)National Natural Science Foundation of China(61975039,61675053,6177504761705051)+1 种基金111 Project(B13015)Fundamental Research Funds for Harbin Engineering University of China。
文摘Light is a precious resource that nature has given to human beings.Converting green,recyclable light energy into the mechanical energy of a micromotor is undoubtedly an exciting challenge.However,the performance of current light-induced micromotor devices is unsatisfactory,as the light-to-work conversion efficiency is only10-15–10-12.In this paper,we propose and demonstrate a laser-induced rotary micromotor operated byΔα-type photopheresis in pure liquid glycerol,whose energy conversion ratio reaches as high as 10-9,which is 3–6 orders of magnitude higher than that of previous light-induced micromotor devices.In addition,we operate the micromotor neither with a light field carrying angular momentum nor with a rotor with a special rotating symmetrical shape.We just employ an annular-core fiber to configure a conical-shaped light field and select a piece of graphite sheet(with an irregular shape)as the micro-rotor.TheΔα-type photophoretic force introduced by the conicalshaped light field drives the rotation of the graphite sheet.We achieve a rotation rate up to 818.2 r/min,which can be controlled by tuning the incident laser power.This optical rotary micromotor is available for twisting macromolecules or generating vortex and shear force in a medium at the nanoscale.
