Isotropic topological second-order spatial differentiator operating in transmission mode
Abstract
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 exhibited a topological charge, making the differentiation operation robust to variations in operating conditions. The demonstrated topological differentiator, however, operates in 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 ± 2 and performs second-order differentiation. Our work points to the potential of harnessing topological concepts for optical computing applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 30, 2021
- Source ID
- 10.1364/ol.430699
Entities
People
- Cheng Guo
- Haiwen Wang
- Olivia Y. Long
- Shanhui Fan
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Office of Naval Research
- Stanford University
- United States Department of Defense