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Silicon-on-insulator multimode-interference waveguide-based arrayed optical tweezers (SMART) for two-dimensional

Ting Lei1, Andrew W Poon

  • 1Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.

Optics Express
|February 8, 2013
PubMed
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We demonstrate a new method for optical trapping and manipulation of particles using Silicon-on-insulator Multimode-interference waveguide-based ARrayed optical Tweezers (SMART). This technique enables precise control of particles in fluidic cells.

Area of Science:

  • Photonics
  • Microfluidics
  • Nanotechnology

Background:

  • Optical tweezers are essential tools for manipulating microscopic particles.
  • Existing optical tweezer technologies face limitations in scalability and precise control.
  • Integrated photonic devices offer potential for advanced optical manipulation systems.

Purpose of the Study:

  • To demonstrate a novel waveguide-based optical tweezer system for two-dimensional particle manipulation.
  • To investigate the capabilities of the Silicon-on-insulator Multimode-interference waveguide-based ARrayed optical Tweezers (SMART) technique.
  • To explore the generation of various optical tweezer patterns for particle manipulation.

Main Methods:

  • Utilized a 100 μm square-core silicon waveguide with millimeter length.

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  • Employed the Silicon-on-insulator Multimode-interference (MMI) waveguide-based ARrayed optical Tweezers (SMART) technique.
  • Tuned fiber-coupling position at the MMI waveguide input to create different tweezer arrays.
  • Performed numerical simulations of optical forces, heat transfer, and thermal-induced microfluidic flow.

    • Main Results:

    • Successfully demonstrated two-dimensional optical trapping and manipulation of 1 μm and 2.2 μm polystyrene particles.
    • Achieved control over particle manipulation by tuning the fiber-coupling position.
    • Generated various patterns of arrayed optical tweezers.
    • Simulated key physical mechanisms governing the arrayed optical trap.

    Conclusions:

    • The SMART technique provides a versatile platform for optical trapping and manipulation.
    • Waveguide-based optical tweezers offer a scalable solution for complex particle manipulation tasks.
    • Understanding thermal effects is crucial for optimizing waveguide-based optical tweezer performance.