Author:
Kuang Ying,Wang Shuai,Mo Bincheng,Sun Shiyou,Xia Kai,Yang Yuanmu
Abstract
AbstractMetalens is a flat, lightweight optical element that may replace traditional bulky refractive lenses and other components in imaging systems. However, a number of critical challenges still remain for most metalenses demonstrated to date, including limited field-of-view (FOV), depth-of-field (DOF), and working bandwidth, which restrict their use in a real-world application. Here, we propose and experimentally demonstrate a compact imaging system equipped with a metalens that simultaneously features a wide FOV of 140° and an extended DOF ranging from 33 to 150 mm. The metalens further allows polarization selectivity, which can be used to remove unwanted surface reflection of the target scene. Using a narrowband vertical-cavity surface-emitting laser for illumination, we show that the system is well-suited for near-infrared palm vein imaging, an emerging modality for biometric identification. The metalens-integrated imaging system provides uncompromised performance with a greatly simplified form factor compared to a traditional system, which may also be adopted for other applications such as depth sensing and endoscopy.
Publisher
Springer Science and Business Media LLC
Reference59 articles.
1. Jain, A. K., Ross, A. & Prabhakar, S. An introduction to biometric recognition. IEEE Trans. Circuits Syst. Video Technol. 14, 4–20 (2004).
2. Bolle, R. M., Connell, J. H., Pankanti, S., Ratha, N. K. & Senior, A. W. Guide to Biometrics (Springer Science & Business Media, 2013).
3. Amazon. Amazon One. https://one.amazon.com/ (2023).
4. Tencent. How Weixin’s palm scan payments is like waving at a friend. https://www.tencent.com.cn/en-us/articles/2201785.html (2024).
5. Grosz, S. A., Godbole, A. & Jain, A. K. Mobile contactless palmprint recognition: use of multiscale, multimodel embeddings. Preprint at https://arxiv.org/abs/2401.08111 (2024).