Optofluidic transport and assembly of nanoparticles using an all-dielectric quasi-BIC metasurface

作     者：Sen Yang Justus C.Ndukaife Sen Yang;Justus C.Ndukaife

作者机构：Department of Electrical and Computer EngineeringVanderbilt UniversityNashvilleTNUSA Interdisciplinary Materials ScienceVanderbilt UniversityNashvilleTNUSA Full list of author information is available at the end of the article 

出 版 物：《Light(Science & Applications)》 (光(科学与应用(英文版))

年 卷 期：2023年第12卷第9期

页      面：1771-1781页

核心收录：

学科分类：0710[理学-生物学] 070207[理学-光学] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：S.Y.and J.C.N.acknowledge financial support from the NSF CAREER Award(NSF ECCS 2143836). 

主　　题：dielectric quasi negligible 

摘      要：Manipulating fluids by light at the micro/nanoscale has been a long-sought-after goal for lab-on-a-chip applications.Plasmonic heating has been demonstrated to control microfluidic dynamics due to the enhanced and confined light absorption from the intrinsic losses of metals.Dielectrics,the counterpart of metals,has been used to avoid undesired thermal effects due to its negligible light absorption.Here,we report an innovative optofluidic system that leverages a quasi-BIC-driven all-dielectric metasurface to achieve subwavelength scale control of temperature and fluid motion.Our experiments show that suspended particles down to 200 nanometers can be rapidly aggregated to the center of the illuminated metasurface with a velocity of tens of micrometers per second,and up to millimeter-scale particle transport is demonstrated.The strong electromagnetic field enhancement of the quasi-BIC resonance increases the flow velocity up to three times compared with the off-resonant situation by tuning the wavelength within several nanometers range.We also experimentally investigate the dynamics of particle aggregation with respect to laser wavelength and power.A physical model is presented and simulated to elucidate the phenomena and surfactants are added to the nanoparticle colloid to validate the model.Our study demonstrates the application of the recently emerged all-dielectric thermonanophotonics in dealing with functional liquids and opens new frontiers in harnessing non-plasmonic nanophotonics to manipulate microfluidic dynamics.Moreover,the synergistic effects of optofluidics and high-Q all-dielectric nanostructures hold enormous potential in high-sensitivity biosensing applications.