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光致旋转技术在微机械和微生物等领域的应用越来越广泛。利用光束自旋角动量可以导致晶体微粒光致旋转的机理,从理论上分析了入射光椭圆度对晶体微粒旋转角速度的影响。通过MATLAB对不同激光功率下,光束的椭圆度与晶体微粒旋转角速度的关系进行数值模拟。结果表明:在实际对晶体微粒光致旋转操作中,晶体微粒能否旋转起来取决于光束椭圆度与微粒厚度之间的关系;在同一激光功率下,光束椭圆度与晶体微粒旋转角速度呈正旋曲线变化。因此,通过调节光束的椭圆度和较高的激光功率可以提高晶体微粒的旋转角速度。该结论对光驱动微机械马达的优化设计有一定的指导意义。
Photo rotation technology in the field of micro-machinery and microorganisms more and more widely used. The mechanism of photo-rotation of crystal particles can be obtained by utilizing the spin-angular momentum of beam, and the influence of the ellipticity of incident light on the angular velocity of crystal particles is theoretically analyzed. The relationship between the ellipticity of the light beam and the rotational angular velocity of the crystal particles under different laser powers is numerically simulated by MATLAB. The results show that whether the crystal particles can rotate depends on the relationship between the ellipticity of the beam and the thickness of the microparticles in the actual rotation of the crystal particles. Under the same laser power, the ellipticity of the beam and the angular velocity of the crystal particles rotate positively Variety. Therefore, the rotational angular velocity of the crystal particles can be increased by adjusting the ovality of the light beam and the high laser power. This conclusion has certain guiding significance for the optimization design of light driven micromachined motor.