Dynamic axial-position control of a laser-trapped particle by wave-front modification.
Dynamic axial-position control of a laser-trapped particle by wave-front modification.
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DOI：
10.1364/ol.28.000465
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发表时间：
2003-03
期刊：
影响因子：
3.6
通讯作者：
T. Ota;S. Kawata;T. Sugiura;M. Booth;M. Neil;R. Juškaitis;T. Wilson
中科院分区：
文献类型：
--
作者：
T. Ota;S. Kawata;T. Sugiura;M. Booth;M. Neil;R. Juškaitis;T. Wilson
利用薄膜变形镜改变激光束的波前，控制了激光俘获粒子的轴向位置。反射镜给出了泽尼克多项式方面的波前调制。通过对Zernike离焦项的调制，我们可以在激光捕获条件下调制粒子的位置。使直径为1微米的聚苯乙烯颗粒以55.4 nm的最小步长沿光轴方向沿着移动2370 nm的距离。我们还证明了粒子振荡沿着光轴通过改变焦点位置在一个正弦的方式。从粒子振荡振幅的频率依赖性，我们确定弹簧常数为91.7 nN/m。
The axial position of a laser-trapped particle has been controlled by modification of the wave front by means of a membrane deformable mirror. The mirror gives wave-front modulation in terms of Zernike polynomials. By modulation of the Zernike defocus term we can modulate the particle position under conditions of laser trapping. A polystyrene particle of 1-microm diameter was moved along the optical axis direction for a distance of 2370 nm in minimum steps of 55.4 nm. We also demonstrated particle oscillation along the optical axis by changing the focal position in a sinusoidal manner. From the frequency dependency of the amplitude of particle oscillation we determined the spring constant as 91.7 nN/m.