Multilayer integrated nano-optical devices

We report optical devices based on monolithic integration of multiple nano-structured optical functional layers. Ultraviolet (UV)-nanoimprint lithography along with thin-film deposition, high aspect-ratio reactive ion etching (RIE) and trench-filling technologies were used in fabrication and integration of individual nano-structured optical functional layers. Structures with sub-50 nm linewidth were required in order to achieve good optical performance in the near-UV and visible wavelengths. The ability to integrate multiple nanostructure-based optical layers opens a path for novel integrated optical devices, as well as a new strategy for driving both miniaturization and cost.