Breaking bandwidth limits in transformation optics with Brewster-enhanced metamaterials.

Xiaojun Hu, Yu Luo, Jingxin Tang, Chun Wang, Yuan Gao, Jingjing Zhang, Yi Zhang, Dexin Ye

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Article in National science review, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

8 authors.

Xiaojun HuLaboratory of Applied Research on Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Yu LuoNational Key Laboratory of Microwave Photonics, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China.ORCID https://orcid.org/0000-0003-2925-682X

Jingxin TangLaboratory of Applied Research on Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Chun WangLaboratory of Applied Research on Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Yuan GaoLaboratory of Applied Research on Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.ORCID https://orcid.org/0000-0003-4748-8536

Jingjing ZhangState Key Laboratory of Millimeter Waves, School of Information Science and Engineering, Southeast University, Nanjing 210096, China.

Yi ZhangLaboratory of Applied Research on Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Dexin YeLaboratory of Applied Research on Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Transformation optics (TO) enables unprecedented electromagnetic wave manipulation through the theory of coordinate transformations, yet its practical implementation has been fundamentally constrained by narrowband operation stemming from extreme material requirements. To break this spectral bottleneck, a dual-mode metamaterial architecture synergizing Brewster-angle broadband transmission with Fabry-Pérot multiband resonance is proposed. This approach leverages cascaded impedance-engineered slot cavities-constructed from conventional dielectrics and standard metallic patterning-to achieve transformation invariance while eliminating exotic material needs. This framework enables two spectral functionalities simultaneously in a single platform: (i) omnidirectional multiband operation through discrete resonances and (ii) broadband unidirectional performance via angular-selective Brewster transmission. Experimental validation demonstrates a full-parameter invisibility cloak maintaining >88.4% transmittance across X-band frequencies (7.5-12.5 GHz) with ±70[Formula: see text] angular tolerance, alongside a retroreflector achieving near-unity efficiency in X/K bands (12-24 GHz) within ±60[Formula: see text] illumination. By resolving the fundamental conflict between bandwidth and geometric complexity in TO designs, this work establishes a scalable paradigm for multifunctional wave-control devices spanning radar stealth to next-generation communications.

Indexed as

Brewster effectbroadband omnidirectional invisibilityfull parametertransformation optics

Identifiers

PMID41822047

DOI10.1093/nsr/nwag023

PMCPMC12976604

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.