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Microwave gain medium with negative refractive index

Author

Listed:
  • Dexin Ye

    (Laboratory of Applied Research on Electromagnetics (ARE), Zhejiang University
    University of Arizona)

  • Kihun Chang

    (University of Arizona)

  • Lixin Ran

    (Laboratory of Applied Research on Electromagnetics (ARE), Zhejiang University)

  • Hao Xin

    (University of Arizona
    University of Arizona)

Abstract

Artificial effective media are attractive because of the fantastic applications they may enable, such as super lensing and electromagnetic invisibility. However, the inevitable loss due to their strongly dispersive nature is one of the fundamental challenges preventing such applications from becoming a reality. In this study, we demonstrate an effective gain medium based on negative resistance, to overcompensate the loss of a conventional passive metamaterial, meanwhile keeping its original negative-index property. Energy conservation-based theory, full-wave simulation and experimental measurement show that a fabricated sample consisting of conventional sub-wavelength building blocks with embedded microwave tunnel diodes exhibits a band-limited Lorentzian dispersion simultaneously with a negative refractive index and a net gain. Our work provides experimental evidence to the assertion that a stable net gain in negative-index gain medium is achievable, proposing a potential solution for the critical challenge current metamateiral technology faces in practical applications.

Suggested Citation

  • Dexin Ye & Kihun Chang & Lixin Ran & Hao Xin, 2014. "Microwave gain medium with negative refractive index," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6841
    DOI: 10.1038/ncomms6841
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    Cited by:

    1. Chao Qian & Yi Yang & Yifei Hua & Chan Wang & Xiao Lin & Tong Cai & Dexin Ye & Erping Li & Ido Kaminer & Hongsheng Chen, 2022. "Breaking the fundamental scattering limit with gain metasurfaces," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Wenzhi Li & Qiyue Yu & Jing Hui Qiu & Jiaran Qi, 2024. "Intelligent wireless power transfer via a 2-bit compact reconfigurable transmissive-metasurface-based router," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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