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Proceedings Paper

Electronically-controlled optical tweezing using space-time-wavelength mapping
Author(s): Shah Rahman; Rasul Torun; Qiancheng Zhao; Tuva Atasever; Ozdal Boyraz
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Paper Abstract

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.

Paper Details

Date Published: 25 August 2015
PDF: 8 pages
Proc. SPIE 9581, Laser Beam Shaping XVI, 95810E (25 August 2015); doi: 10.1117/12.2192487
Show Author Affiliations
Shah Rahman, Univ. of California, Irvine (United States)
Rasul Torun, Univ. of California, Irvine (United States)
Qiancheng Zhao, Univ. of California, Irvine (United States)
Tuva Atasever, Univ. of California, Irvine (United States)
Ozdal Boyraz, Univ. of California, Irvine (United States)

Published in SPIE Proceedings Vol. 9581:
Laser Beam Shaping XVI
Andrew Forbes; Todd E. Lizotte, Editor(s)

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