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Multipath Trapping Dynamics of Nanoparticles towards an Integrated Silicon Slot Waveguide
1 , 1 , * 1 , 2 , 3 , * 3
1  Key Laboratory of Opto-electronic Information Technical Science of Ministry of Education, School of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2  College of Optics and Photonics, CREOL and FPCE, University of Central Florida. Orlando, FL 32816. USA
3  Microphotonics Center, Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA


We study the trapping dynamics of a nanoparticle near a silicon slot waveguide. It is shown for the first time that a nanoparticle can go along different paths before it becomes trapped. The optical forces originating from different parts of an optical mode compete with each other during particle transport, forming a complicated particle trajectory and particularly a critical area where particle transport becomes unstable. Brownian motion is simulated for 50-nm and 100-nm nanoparticles, and the induced instability is analyzed.

Keywords: Optical trapping, optofluidics, trapping dynamics, silicon waveguide, nanoparticle