Open AccessContactless optical trapping and manipulation of nanoparticles utilizing SIBA mechanism and EDL force
Author(s) -
Mahdi Sahafi,
Amir Habibzadeh-Sharif
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.028944
Subject(s) - optical tweezers , optical force , trapping , optics , materials science , tweezers , photonic crystal , optoelectronics , wavelength , nanometre , optical power , diffraction , nanotechnology , physics , laser , ecology , biology
On-chip optical tweezers based on evanescent fields overcome the diffraction limit of the free-space optical tweezers and can be a promising technique for developing lab-on-a-chip devices. While such trapping allows for low-cost and precise manipulation, it suffers from unavoidable contact with the device surface, which eliminates one of the major advantages of the optical trapping. Here, we use a 1D photonic crystal cavity to trap nanoparticles and propose a novel method to control and manipulate the particle distance from the cavity utilizing a self-induced back-action (SIBA) mechanism and electrical-double-layer (EDL) force. It is numerically shown that a 200 nm radius silica particle can be trapped near the cavity with a potential well deeper than 178k B T by 1 mW of input power without any contact with the surface and easily moved vertically with nanometer precision by wavelength detuning.