Open AccessObservation of reflectionless absorption due to spatial Kramers–Kronig profile
Author(s) -
Dexin Ye,
Cheng Cao,
Tianyi Zhou,
Jiangtao Huangfu,
Guoan Zheng,
Lixin Ran
Publication year - 2017
Publication title -
nature communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.559
H-Index - 365
ISSN - 2041-1723
DOI - 10.1038/s41467-017-00123-4
Subject(s) - absorption (acoustics) , kramers–kronig relations , dispersion (optics) , wideband , physics , computational physics , optics , lorentz transformation , electromagnetics , space (punctuation) , computer science , refractive index , quantum mechanics , engineering physics , operating system
As a fundamental phenomenon in electromagnetics and optics, material absorption has been extensively investigated for centuries. However, omnidirectional, reflectionless absorption in inhomogeneous media has yet to be observed. Previous research on transformation optics indicated that such absorption cannot easily be implemented without involving gain media. A recent theory on wave propagation, however, implies the feasibility to implement such absorption requiring no gain, provided that the permittivity profile of this medium can satisfy the spatial Kramers–Kronig relations. In this work, we implement such a profile over a broad frequency band based on a novel idea of space–frequency Lorentz dispersion. A wideband, omnidirectionally reflectionless absorption is then experimentally observed in the gigahertz range, and is in good agreement with theoretical analysis and full-wave simulations. The proposed method based on the space–frequency dispersion implies the practicability to construct gain-free omnidirectionally non-reflecting absorbers.