Huang Qiangsheng, Jia Jing, Forsberg Erik, He Sailing
Opt Express. 2021 Mar 1;29(5):7168-7178. doi: 10.1364/OE.418907.
A vertical slot LiNbO waveguide with an Ag nanowire and 3L MoS embedded in the low-refractive index slot region is proposed for the purpose of improving light confinement. We find that the proposed waveguide has a novel dielectric based plasmonic mode, where local light field is enhanced by the Ag nanowire. The mode exhibits an extremely large figure of merit (FoM) of 6.5×10, one order of magnitude larger than that the largest FoM of any plasmonic waveguide reported in the literature to date. The waveguide also has an extremely long propagation length of 84 cm in the visible wavelength at 680 nm. Furthermore, the waveguide has a low sub-micro bending loss and can be directly connected to all-dielectric waveguides with an extremely low coupling loss. The proposed vertical slot LiNbO waveguide is a promising candidate for the realization of ultrahigh integration density tunable circuits in the visible spectral range.
为了提高光限制，提出了一种在低折射率狭缝区域嵌入银纳米线和3L二硫化钼的垂直狭缝铌酸锂波导。我们发现，所提出的波导具有一种基于新型电介质的表面等离激元模式，其中局部光场被银纳米线增强。该模式具有6.5×10的极大品质因数（FoM），比迄今为止文献中报道的任何表面等离激元波导的最大品质因数大一个数量级。该波导在680nm可见波长下还具有84cm的极长传播长度。此外，该波导具有低的亚微弯曲损耗，并且可以以极低的耦合损耗直接连接到全电介质波导。所提出的垂直狭缝铌酸锂波导是在可见光谱范围内实现超高集成密度可调谐电路的有前途的候选者。
