2024-03-14 デューク大学(Duke)
＜関連情報＞
- https://pratt.duke.edu/news/absorption-limit/
- https://www.degruyter.com/document/doi/10.1515/nanoph-2023-0920/html
透明均質層の厚さ限界に対する基本的な吸収帯域幅 Fundamental absorption bandwidth to thickness limit for transparent homogeneous layers
Willie J. Padilla, Yang Deng, Omar Khatib and Vahid Tarokh
Nanophotonics Published:March 8, 2024
DOI:https://doi.org/10.1515/nanoph-2023-0920
Abstract
Past work has considered the analytic properties of the reflection coefficient for a metal-backed slab. The primary result established a fundamental relationship for the minimal layer thickness to bandwidth ratio achievable for an absorber. There has yet to be establishment of a similar relationship for non-metal-backed layers, and here we present the universal result based on the Kramers–Kronig relations. Our theory is validated with transfer matrix calculations of homogeneous materials, and full-wave numerical simulations of electromagnetic metamaterials. Our results place more general fundamental limits on absorbers and thus will be important for both fundamental and applied studies.
