High-efficiency broadband achromatic metalens for near-IR biological imaging window.

ABSTRACT: Over the past years, broadband achromatic metalenses have been intensively studied due to their great potential for applications in consumer and industry products. Even though significant progress has been made, the efficiency of technologically relevant silicon metalenses is limited by the intrinsic material loss above the bandgap. In turn, the recently proposed achromatic metalens utilizing transparent, high-index materials such as titanium dioxide has been restricted by the small thickness and showed relatively low focusing efficiency at longer wavelengths. Consequently, metalens-based optical imaging in the biological transparency window has so far been severely limited. Herein, we experimentally demonstrate a polarization-insensitive, broadband titanium dioxide achromatic metalens for

SUBMITTER: Wang Y 

PROVIDER: S-EPMC8455568 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature