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arXiv 1509.04058physics.optics
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利用时空波长映射实现光镊的电子控制

Electronic control of optical tweezers using space-time-wavelength mapping

Shah Rahman, Rasul Torun, Qiancheng Zhao, Ozdal Boyraz

摘要:

我们提出了一种新的方法,通过使用空间-时间-波长映射(STWM),一种技术,使用时域调制来控制局部强度值,从而产生的光学力,在空间中的电子控制的光镊。所提出的技术能够直接控制由洛伦兹力(梯度力)产生的力热点的大小、位置和极性。在本文中,我们开发了一个分析配方的建议STWM技术的光镊。在这里介绍的案例研究中,我们表明,150 fs的光脉冲在时间和空间上分散,以实现一个聚焦的椭圆光束,是~20 μm长,~2 μm宽。通过选择适当的RF波形和电光调制器,我们可以产生多个热点,每个脉冲的力>200 pN。

英文摘要:

We present a new approach for electronic control of optical tweezers by using space-time-wavelength mapping (STWM), a technique that uses time-domain modulation to control local intensity values, and hence the resulting optical force, in space. The proposed technique enables direct control of magnitude, location, and polarity of force hot-spots created by Lorentz force (gradient force). In this paper, we develop an analytical formulation of the proposed STWM technique for optical tweezing. In the case study presented here, we show that 150 fs optical pulses are dispersed in time and space to achieve a focused elliptical beam that is ~20 μm long and ~2 μm wide. By choosing the appropriate RF waveform and electro-optic modulator, we can generate multiple hot-spots with >200 pN force per pulse.

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