Abstract
This study reports a metamaterial consisting of a nanofluidic channel sandwiched between plasmonic resonators and a metal film. This configuration enables a controllable delivery of molecules into the most enhanced field arising from the quadrupole mode of the structure, forming a strong plasmon-molecular coupled system. It offers an ultrasensitive IR spectroscopic platform for identification and quantitative detection of molecules. Morover, the precise handling of molecules in a wellcontrolled nanogap allows us to stydy the molecular structures and physical properties of molecules confined in nanospaces.