Imaging Properties of Large Field-of-View Quadratic Metalenses and Their Applications to Fingerprint Detection

Imaging Properties of Large Field-of-View Quadratic Metalenses and Their Applications to Fingerprint Detection

ACS Photonics

10.1021/acsphotonics.1c00237

http://dx.doi.org/10.1021/acsphotonics.1c00237

Emmanuel Lassalle, Tobias W. W. Mass, Damien Eschimese, Anton V. Baranikov, Egor Khaidarov, Shiqiang Li, Ramón Paniagua-Domínguez, Arseniy I. Kuznetsov

Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Biotechnology, Atomic and Molecular Physics, and Optics

30 April 2021

Lassalle, E., Mass, T. W. W., Eschimese, D., Baranikov, A. V., Khaidarov, E., Li, S., … Kuznetsov, A. I. (2021). Imaging Properties of Large Field-of-View Quadratic Metalenses and Their Applications to Fingerprint Detection. ACS Photonics, 8(5), 1457–1468. doi:10.1021/acsphotonics.1c00237

Dielectric metasurfaces, extremely thin nanostructured dielectric surfaces, hold promise to replace conventional refractive optics, such as lenses, due to their high performance and compactness. However, designing large field-of-view (FOV) metalenses, which are of particular importance when imaging relatively big objects at short distances, remains one of the most critical challenges. Recently, metalenses implementing a quadratic phase profile have been put forward to solve this problem with a single element, but despite their theoretical ability to provide 180° FOV, imaging over very large FOV has not been demonstrated yet. In this work, we provide an in-depth analysis of the imaging properties of quadratic metalenses and, in particular, show that due to their intrinsic barrel distortion or fish-eye effect, there is a fundamental trade-off between the FOV achievable in a given imaging configuration and the optical resolution of the metalens and/or the detector resolution. To illustrate how to harness the full potential of quadratic metalenses, we apply these considerations to the fingerprint detection problem and demonstrate experimentally the full imaging of a 5 mm fingerprint with features of the order of 100 μm, with a metalens ten times smaller in size and located at a distance of only 2.5 mm away from the object. This constitutes the most compact imaging system reported so far for fingerprint detection.

Publisher Copyright

This research / project is supported by the National Research Foundation of Singapore - NRF Investigatorship
Grant Reference no. : NRF-NRFI2017-01

This research / project is supported by the A*STAR - A*STAR SERC Pharos program
Grant Reference no. : 152 73 00025

This research / project is supported by the A*STAR - AME Programmatic Grant
Grant Reference no. : A18A7b0058

Institution of Engineering and Technology A F Harvey Engineering Research Prize 2016

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acsphotonics.1c00237

https://oar.a-star.edu.sg/communities-collections/articles/17711

2330-4022

Institute of Materials Research and Engineering