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

Yujie Wang, Qinmiao Chen, Wenhong Yang, Ziheng Ji, Limin Jin, Xing Ma, Qinghai Song, Alexandra Boltasseva, Jiecai Han, Vladimir M. Shalaev and Shumin Xiao ()
Additional contact information
Yujie Wang: Harbin Institute of Technology (Shenzhen)
Qinmiao Chen: Harbin Institute of Technology (Shenzhen)
Wenhong Yang: Harbin Institute of Technology (Shenzhen)
Ziheng Ji: Harbin Institute of Technology (Shenzhen)
Limin Jin: Harbin Institute of Technology (Shenzhen)
Xing Ma: Harbin Institute of Technology (Shenzhen)
Qinghai Song: Harbin Institute of Technology (Shenzhen)
Alexandra Boltasseva: Purdue University
Jiecai Han: Harbin Institute of Technology
Vladimir M. Shalaev: Purdue University
Shumin Xiao: Harbin Institute of Technology (Shenzhen)

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: 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 applications in the near-infrared biological imaging. A large-scale fabrication technology has been developed to produce titanium dioxide nanopillars with record-high aspect ratios featuring pillar heights of 1.5 µm and ~90° vertical sidewalls. The demonstrated metalens exhibits dramatically increased group delay range, and the spectral range of achromatism is substantially extended to the wavelength range of 650–1000 nm with an average efficiency of 77.1%–88.5% and a numerical aperture of 0.24–0.1. This research paves a solid step towards practical applications of flat photonics.

Date: 2021
References: Add references at CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
https://www.nature.com/articles/s41467-021-25797-9 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25797-9

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-021-25797-9

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().