Isotropic Topological Second-Order Spatial Differentiator Operating in Transmission Mode
| Autor: | Long, Olivia Y., Guo, Cheng, Wang, Haiwen, Fan, Shanhui |
|---|---|
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Opt. Lett. 46, 3247-3250 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1364/OL.430699 |
| Popis: | Differentiation has widespread applications, particularly in image processing for edge detection. Significant advances have been made in using nanophotonic structures and metamaterials to perform such operations. In particular, a recent work demonstrated a topological differentiator in which the transfer function exhibits a topological charge, making the differentiation operation robust to variation of operating conditions. The demonstrated topological differentiator, however, operates in the reflection mode at off-normal incidence and is difficult to integrate into compact imaging systems. In this work, we design a topological differentiator that operates isotropically in transmission mode at normal incidence. The device exhibits an optical transfer function with a symmetry-protected, topological charge of $\pm 2$ and performs second-order differentiation. Our work points to the potential of harnessing topological concepts for optical computing applications. Comment: 5 pages, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|