Broadband Thermal Imaging using Meta-Optics
| Autor: | Huang, Luocheng, Han, Zheyi, Wirth-Singh, Anna, Saragadam, Vishwanath, Mukherjee, Saswata, Fröch, Johannes E., Tanguy, Quentin A. A., Rollag, Joshua, Gibson, Ricky, Hendrickson, Joshua R., Hon, Phillip W. C., Kigner, Orrin, Coppens, Zachary, Böhringer, Karl F., Veeraraghavan, Ashok, Majumdar, Arka |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Subwavelength diffractive optics known as meta-optics have demonstrated the potential to significantly miniaturize imaging systems. However, despite impressive demonstrations, most meta-optical imaging systems suffer from strong chromatic aberrations, limiting their utilities. Here, we employ inverse-design to create broadband meta-optics operating in the long-wave infrared (LWIR) regime (8 - 12 $\mu$m). Via a deep-learning assisted multi-scale differentiable framework that links meta-atoms to the phase, we maximize the wavelength-averaged volume under the modulation transfer function (MTF) of the meta-optics. Our design framework merges local phase-engineering via meta-atoms and global engineering of the scatterer within a single pipeline. We corroborate our design by fabricating and experimentally characterizing all-silicon LWIR meta-optics. Our engineered meta-optic is complemented by a simple computational backend that dramatically improves the quality of the captured image. We experimentally demonstrate a six-fold improvement of the wavelength-averaged Strehl ratio over the traditional hyperboloid metalens for broadband imaging. Comment: 28 pages, 12 figures |
| Databáze: | arXiv |
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