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Near-field optical micromanipulation with cavity enhanced evanescent waves

Near-field optical micromanipulation with cavity enhanced evanescent waves. Peter J. Reece,a Veneranda Garcés-Chávez, and Kishan Dholakia School of Physics and Astronomy, University of St Andrews, Saint Andrews, Fife KY16 9SS, Scotland, United Kingdom. Prepared by David Keng Nov. 3, 2006.

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Near-field optical micromanipulation with cavity enhanced evanescent waves

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  1. Near-field optical micromanipulation with cavity enhanced evanescent waves Peter J. Reece,a Veneranda Garcés-Chávez, and Kishan Dholakia School of Physics and Astronomy, University of St Andrews, Saint Andrews, Fife KY16 9SS, Scotland, United Kingdom Prepared by David Keng Nov. 3, 2006

  2. Important things in this paper • Near-field optical micromanipulation with cavity enhanced evanescent waves • Near-field optical micromanipulation • cavity enhanced evanescent waves

  3. Near-field optical micromanipulation • Optical guiding and/or trapping particle with evanescent waves

  4. Near-field optical micromanipulation • In this paper…1064 nm CW laser (4 W, IPG Yb doped fiber laser) Velocity of 5 m polymer colloids at a BK7 glass-water interface… ~4 um/s1.8W focused to a 200um spot (without enhancement layer!)With enhancement layer… 22±2.7 um/s!! 1.8 W / (2 x 10-4m)2 = 4.5 x 107 W/m2 Theirs…0.005 W / (4 x 10-6m)2 = 3.1 x 108 W/m2 Inside MP3L tapered fiber

  5. Conclusion for Near-field optical micromanipulation • To guide a particle… particle trapped within E.W. above surface • To trap a particle… two counter propagating waves • Larger the particle size… easier to trap smaller the Brownian motion (high drag) higher polarizability (stronger trapping force) • Should be able to perform on the tapered fiber…

  6. Enhancement • “dielectric resonator”Looks like this… SF11 SiO21000nm ZrO2127nm H2O 1.754 1.45 1.97 1.33

  7. Enhancement • Light is launched into the 127nm layer • 32 times of the incident intensity in the layer • 25 times at the surface • 5~10 times measured… v = 2~4 vs. 22

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