Strong light confinement and gradient force in a hexagonal boron nitride slot waveguide.
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  nN/μm×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  nN/mW and a power confinement ratio of 50% have been obtained. The h-BN slot waveguide may have potential in particle manipulation.
Bofeng
B
Zhu
Guobin
G
Ren
Yixiao
Y
Gao
Haisu
H
Li
Beilei
B
Wu
Shuisheng
S
Jian