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Proceedings Paper

Near-field optically driven Brownian motors (Conference Presentation)
Author(s): Shao-Hua Wu; Ningfeng Huang; Eric Jaquay; Michelle L. Povinelli
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Paper Abstract

Brownian ratchets are of fundamental interest in fields from statistical physics to molecular motors. The realization of Brownian ratchets in engineered systems opens up the potential to harness thermal energy for directed motion, with applications in transport and sorting of nanoparticles. Implementations based on optical traps provide a high degree of tunability along with precise spatiotemporal control. Near-field optical methods provide particular flexibility and ease of on-chip integration with other microfluidic components. Here, we demonstrate the first all-optical, near-field Brownian ratchet. Our approach uses an asymmetrically patterned photonic crystal and yields an ultra-stable trap stiffness of 253.6 pN/nm-W, 100x greater than conventional optical tweezers. By modulating the laser power, optical ratcheting with transport speed of ~1 micron/s can be achieved, allowing a variety of dynamical lab-on-a-chip applications. The resulting transport speed matches well with the theoretical prediction.

Paper Details

Date Published: 10 November 2016
PDF: 1 pages
Proc. SPIE 9922, Optical Trapping and Optical Micromanipulation XIII, 99221Y (10 November 2016); doi: 10.1117/12.2239064
Show Author Affiliations
Shao-Hua Wu, The Univ. of Southern California (United States)
Ningfeng Huang, The Univ. of Southern California (United States)
Eric Jaquay, The Univ. of Southern California (United States)
Michelle L. Povinelli, The Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 9922:
Optical Trapping and Optical Micromanipulation XIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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