Abstract

In this Letter, we show that a hexagonal boron nitride (h-BN) slot waveguide can achieve strong field enhancement and light confinement in a slot region and a giant gradient force between h-BN slabs. Excellent agreement between simulations and results from an analytical model is observed. In a two-dimensional case, a field enhancement ratio near 60, a power confinement ratio of 80%, and a gradient force over $-8.5\mathrm{nN}/\mathrm{\mu m}\times \mathrm{mW}$ have been achieved, which are much higher than the slot waveguide based on artificial hyperbolic metamaterials. The gradient force and power confinement ratio in a three-dimensional slot waveguide structure are also studied. A gradient force of $-1.2\mathrm{nN}/\mathrm{mW}$ and a power confinement ratio of 50% have been obtained. The h-BN slot waveguide may have potential in particle manipulation.

© 2016 Optical Society of America

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