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1. (WO2017035189) SYSTEMS AND METHODS FOR PARTICLE GUIDING

Pub. No.:    WO/2017/035189    International Application No.:    PCT/US2016/048315
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: G01N 33/00
G02F 1/00
G02F 1/1337
B81B 1/00
B81B 3/00
B82B 1/00
B82B 3/00
Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventors: ILIC, Ognjen
KAMINER, Ido E.
SOLJACIC, Marin
LAHINI, Yoav
Title: SYSTEMS AND METHODS FOR PARTICLE GUIDING
Abstract:
A technique to guide a micro- or nano-scale particle uses the wavelengths of light beams to control the direction of motion of the particle. In this technique, an optical asymmetry is introduced into the particle to form a composite particle. The composite particle includes two faces that preferentially absorb light of different wavelengths, independent of the particle orientation. The difference in absorption spectra of the two faces creates a bidirectional and local thermal gradient that is externally switchable by changing the wavelength of the incident light beams. This thermal gradient induces a thermophoretic drift that moves the composite particle. A two-faced nanoparticle can be guided using the optically induced thermophoretic drift as the propulsion mechanism.