Experimental Realization of an Extreme-Parameter Omnidirectional Cloak
- Zhejiang Univ., Hangzhou (China). Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, College of Information Science and Electronic Engineering, State Key Lab. of Modern Optical Instrumentation and The Electromagnetics Academy
- Zhejiang Univ., Hangzhou (China). Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, College of Information Science and Electronic Engineering, State Key Lab. of Modern Optical Instrumentation and The Electromagnetics Academy; Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Zhejiang Univ., Hangzhou (China). Inst. of Marine Electronics Engineering
- Zhejiang Univ., Hangzhou (China). Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, College of Information Science and Electronic Engineering
- Ames Lab. and Iowa State Univ., Ames, IA (United States); Foundation for Research & Technology – Hellas (FORTH), Crete (Greece). Inst. of Electronic Structure and Laser
An ideal transformation-based omnidirectional cloak always relies on metamaterials with extreme parameters, which were previously thought to be too difficult to realize. For such a reason, in previous experimental proposals of invisibility cloaks, the extreme parameters requirements are usually abandoned, leading to inherent scattering. Here, we report on the first experimental demonstration of an omnidirectional cloak that satisfies the extreme parameters requirement, which can hide objects in a homogenous background. Instead of using resonant metamaterials that usually involve unavoidable absorptive loss, the extreme parameters are achieved using a nonresonant metamaterial comprising arrays of subwavelength metallic channels manufactured with 3D metal printing technology. A high level transmission of electromagnetic wave propagating through the present omnidirectional cloak, as well as significant reduction of scattering field, is demonstrated both numerically and experimentally. Our work may also inspire experimental realizations of the other full-parameter omnidirectional optical devices such as concentrator, rotators, and optical illusion apparatuses.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-07CH11358; 320081
- OSTI ID:
- 1562682
- Report Number(s):
- IS-J-10036
- Journal Information:
- Research, Vol. 2019; ISSN 2639-5274
- Country of Publication:
- United States
- Language:
- English
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