Phys.org March 14, 2024
Past work has considered the analytic properties of the reflection coefficient for a metal-backed slab and established a fundamental relationship for the minimal layer thickness to bandwidth ratio achievable for an absorber, but a similar relationship for non-metal-backed layers is not established. Based on Kramers–Kronig relations researchers at Duke University have developed a universal result. They validated their theory with transfer matrix calculations of homogeneous materials, and full-wave numerical simulations of electromagnetic metamaterials. According to the researchers their results place more general fundamental limits on absorbers, and it will be important for both fundamental and applied studies… read more. Open Access TECHNICAL ARTICLEÂ
Contour used for integration of Eq. (11). Credit: Nano Photonics, March 8, 2024 https://www.degruyter.com/document/doi/10.1515/nanoph-2023-0920/htm