Abstract

Optical tweezers have opened new doors in microscale research such as single-cell handling and analysis. To develop this technique to nanoscale applications, a number of near-field techniques have been introduced, but they suffer from issues and limitations. Here, we propose simple schemes built by SOI-based optical ring resonators that have efficient trapping and precise transporting functionalities, which are applicable for optical manipulation of nanoparticles. The distribution of the optical intensity excited in a ring resonator and its resultant optical forces on the nanoparticles are calculated numerically. According to the calculations, a subwavelength polystyrene particle as small as 12 nm in radius can be trapped with a depth of $10k_{\mathrm{B}}T$ by an input power of 10 mW and conveyed to a specified location along the ring with nanometer precision. In addition, we show that the introduced schemes are capable of analyzing physical properties of biostructures such as the binding force of a DNA molecule.

© 2019 Optical Society of America

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