1. Wide Field-of-View, Large-Area Long-wave Infrared Silicon Metalenses
- Author
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Lin, Hung-I, Geldmeier, Jeffrey, Baleine, Erwan, Yang, Fan, An, Sensong, Pan, Ying, Rivero-Baleine, Clara, Gu, Tian, and Hu, Juejun
- Subjects
Physics - Optics ,Physics - Applied Physics - Abstract
Long-wave infrared (LWIR, 8-12 $\mu m$ wavelengths) is a spectral band of vital importance to thermal imaging. Conventional LWIR optics made from single-crystalline Ge and chalcogenide glasses are bulky and fragile. The challenge is exacerbated for wide field-of-view (FOV) optics, which traditionally mandates multiple cascaded elements that severely add to complexity and cost. Here we designed and experimentally realized a LWIR metalens platform based on bulk Si wafers featuring 140$^\circ$ FOV. The metalenses, which have diameters exceeding 4 cm, were fabricated using a scalable wafer-level process involving photolithography and deep reactive ion etching. Using a metalens-integrated focal plane array, we further demonstrated wide-angle thermal imaging.
- Published
- 2023