Synthesis and optical properties of shaped gold nanomaterials under dark-field microscope

Abstract

Nanophotonics has raised a great attention because detection limit can easily go down to the molecular level. Herein, we present a dark-field integrated Light-eye Technology (iLeyeT) system for monitoring of polarization-dependent surface plasmons of single shaped nanomaterials. Single shaped gold nanomaterial such as gold nanorod present both longitudinal and transverse surface plasmonic resonance under dark-field microscope. The orientation of single nanomaterials significantly tunes the direction of polarized light. We introduce a programmable light source into the dark-field microscope and image the relative peak intensities of the transverse and longitudinal surface plasmon via fast tuning wavelength. The signals from single nanomaterials can be visualized and detected by the dark-field iLeyeT system.