Design and experimental investigation of nano-structured optical polarizing elements based on two-photon photopolymerization

摘要

In this paper, a nano-polarization device based on two-photon polymerization reduction was designed and experimentallyinvestigated. A broadband near-infrared (3-5 μ m) linear polarizer doped with metal particles was designed. Differentfrom the fabrication methods of lithography and ion etching used in traditional metallic gratings or nanostructures, a twophotonabsorption-based photo-reduction and photopolymerization process was adopted. The mixed solution composedby gold salt and photoresist is exposed by a femtosecend laser at a wavelength of 780 nm, at which the reduction reactionof the gold ions and the polymerization reaction of the resin are completed simultaneously, and thereby metal particles inthe polymerized material can be obtained. The clusters of the reduced gold particles were observed by scanning electronmicroscopy, and the peak of gold was found in the energy dispersive X-ray spectrometer, which demonstrated thefeasibility of the experiment and laid the foundation for the subsequent functional device fabrication.