Manipulation of Fluid Convection by Surface Lattice Resonance

摘要

The capability of plasmonic metasurfaces (PMs) under illumination togenerate heat and induce fluid convection is a promising building approachfor optofluidic applications. However, the low quality (Q)-factor in PMsintroduced into optofluidic applications remains a challenging problem. Inthis paper, a PM optofluidic platform based on surface lattice resonance(SLR) with a high Q-factor is proposed. Numerical results demonstrate thatSLR-based metasurfaces can manipulate the convective flow of fluid at thenanoscale, with the Q-factor approaching 138. Moreover, compared to thelocalized surface plasmon resonance-based metasurface, the SLR-basedmetasurfaces exhibit improved absorption, temperature rise, and flow velocityperformance. In particular, the absorption coefficient at the SLR peak in anadequately designed PM can be close to unity. This study reveals that SLR isan efficient and alternative method to manipulate the fluid flow, and pavesthe way to flexible wavelength-scale devices for optofluidic applications.