Ahluwalia Balpreet Singh, Helle Øystein Ivar, Hellesø Olav Gaute
Opt Express. 2016 Mar 7;24(5):4477-4487. doi: 10.1364/OE.24.004477.
Rib waveguides are investigated as an alternative to strip waveguides for planar trapping and transport of microparticles. Microparticles are successfully propelled along the surface of rib waveguides and trapped in the gap between opposing rib waveguides. The trapping capabilities of waveguide end facets formed by a single and opposing waveguide geometries are investigated. The slab beneath a rib waveguide continues to guide light after the end facet of a rib waveguide. Thus particles can be trapped in wider gaps formed by opposing rib waveguides than with strip waveguides. Rib waveguides were found more efficient in trapping a collection of particles in the gap and particles could be moved to different locations in the gap by changing the relative power in the two opposing rib waveguides. Numerical simulations are used to show that the trapping efficiency on the surface of rib and strip waveguides is comparable. The simulations also confirm the advantage of opposing rib waveguides for trapping particles in wide gaps. The low sidewalls of rib waveguides give low propagation losses and make it easy to integrate rib waveguides with other functions in a lab-on-a-chip where particle trapping and transport is required.
研究了肋形波导作为条形波导的替代方案，用于平面捕获和传输微粒。微粒成功地沿着肋形波导表面推进，并被困在相对的肋形波导之间的间隙中。研究了由单个和相对的波导几何结构形成的波导端面的捕获能力。肋形波导下方的平板在肋形波导端面之后继续引导光。因此，与条形波导相比，微粒可以被困在由相对的肋形波导形成的更宽间隙中。发现肋形波导在将一组微粒捕获在间隙中更有效，并且通过改变两个相对的肋形波导中的相对功率，可以将微粒移动到间隙中的不同位置。数值模拟表明，肋形和条形波导表面的捕获效率相当。模拟还证实了相对的肋形波导在宽间隙中捕获微粒的优势。肋形波导的低侧壁具有低传播损耗，并且便于在需要微粒捕获和传输的芯片实验室中将肋形波导与其他功能集成。
