25 August 2015 Electronically-controlled optical tweezing using space-time-wavelength mapping
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We propose electronically controlled optical tweezing based on space-time-wavelength mapping technology. By using time-domain modulation, the location and the polarity of force hot-spots created by Lorentz force (gradient force) can be controlled. In this preliminary study we use 150 fs optical pulses that are dispersed in time and space to achieve a focused elliptical beam that is ~20 μm long and ~2 μm wide. We use an electro-optic modulator to modulate power spectral distribution of the femtosecond beam after temporal dispersion and hence change the intensity gradient along the beam at the focal spot. We present a theoretical model, and simulation results from a proposed experimental setup. The results show that we can achieve ±200 pN forces on nano objects (~100 nm) without mechanical beam steering. The intensity of wavelengths along the spectrum can be manipulated by using different RF waveforms to create a desired intensity gradient profile at the focal plane. By choosing the appropriate RF waveform it is possible to create force fields for cell stretching and compression as well as multiple hot spots for attractive or repulsive forces. 2D space-time-wavelength mapping can also be utilized to create tunable 2D force field distribution.
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Shah Rahman, Shah Rahman, Rasul Torun, Rasul Torun, Qiancheng Zhao, Qiancheng Zhao, Tuva Atasever, Tuva Atasever, Ozdal Boyraz, Ozdal Boyraz, } "Electronically-controlled optical tweezing using space-time-wavelength mapping", Proc. SPIE 9581, Laser Beam Shaping XVI, 95810E (25 August 2015); doi: 10.1117/12.2192487; https://doi.org/10.1117/12.2192487

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