Extremely Thin Perfect Absorber by Generalized Multipole Bianisotropic Effect

verfasst von

Hao Ma, Andrey B. Evlyukhin, Andrey E. Miroshnichenko, Fengjie Zhu, Siyu Duan, Jingbo Wu, Caihong Zhang, Jian Chen, Biaobing Jin, Willie J. Padilla, Kebin Fan

Abstract

Symmetry breaking plays a crucial role in understanding the fundamental physics underlying numerous physical phenomena, including the electromagnetic response in resonators, giving rise to intriguing effects such as directional light scattering, supercavity lasing, and topologically protected states. This work demonstrates that adding a small fraction of lossy metal (as low as 1 × 10⁻⁶ in volume) to a lossless dielectric resonator breaks inversion symmetry (IS), thereby lifting its degeneracy, leading to a strong bianisotropic response. In the case of the metasurface composed of such resonators, this effect leads to unidirectional perfect absorption while maintaining nearly perfect reflection from the opposite direction. It has developed more general Onsager-Casimir relations for the polarizabilities of particle arrays, taking into account the contributions of quadrupoles, which shows that bianisotropy is not solely due to dipoles, but also involves high-order multipoles. The experimental validation demonstrates an extremely thin terahertz-perfect absorber with a wavelength-to-thickness ratio of up to 25,000, where the material thickness is only 2% of the theoretical minimum thickness dictated by the fundamental limit. The findings can pave a new route to design devices for applications involving optical-to-heat conversion processes.

Organisationseinheit(en)

Institut für Quantenoptik
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme

Externe Organisation(en)

Nanjing University
Purple Mountain Laboratories
University of New South Wales (UNSW)
Duke University

Typ

Artikel

Journal

Advanced optical materials

Band

12

ISSN

2195-1071

Publikationsdatum

13.03.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Elektronische, optische und magnetische Materialien, Atom- und Molekularphysik sowie Optik

Elektronische Version(en)

https://doi.org/10.48550/arXiv.2308.07139 (Zugang: Offen)
https://doi.org/10.1002/adom.202301968 (Zugang: Geschlossen)