Broadband surface-wave transformation cloak
Name
Xu-2015-Broadband surface-wa.pdf
Size
1.18 MB
Format
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Checksum (MD5)
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Author(s)
Xu, Su
Xu, Hongyi
Gao, Hanhong
Jiang, Yuyu
Yu, Faxin
Joannopoulos, John D.
Chen, Hongsheng
Sun, Handong
Zhang, Baile
Soljacic, Marin
Date Issued
June 2015
Journal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences (U.S.)
Citation
Xu, Su, Hongyi Xu, Hanhong Gao, Yuyu Jiang, Faxin Yu, John D. Joannopoulos, Marin Soljačić, Hongsheng Chen, Handong Sun, and Baile Zhang. “Broadband Surface-Wave Transformation Cloak.” Proc Natl Acad Sci USA 112, no. 25 (June 8, 2015): 7635–7638.
Version
Final published version
Abstract
Guiding surface electromagnetic waves around disorder without disturbing the wave amplitude or phase is in great demand for modern photonic and plasmonic devices, but is fundamentally difficult to realize because light momentum must be conserved in a scattering event. A partial realization has been achieved by exploiting topological electromagnetic surface states, but this approach is limited to narrow-band light transmission and subject to phase disturbances in the presence of disorder. Recent advances in transformation optics apply principles of general relativity to curve the space for light, allowing one to match the momentum and phase of light around any disorder as if that disorder were not there. This feature has been exploited in the development of invisibility cloaks. An ideal invisibility cloak, however, would require the phase velocity of light being guided around the cloaked object to exceed the vacuum speed of light—a feat potentially achievable only over an extremely narrow band. In this work, we theoretically and experimentally show that the bottlenecks encountered in previous studies can be overcome. We introduce a class of cloaks capable of remarkable broadband surface electromagnetic waves guidance around ultrasharp corners and bumps with no perceptible changes in amplitude and phase. These cloaks consist of specifically designed nonmagnetic metamaterials and achieve nearly ideal transmission efficiency over a broadband frequency range from 0+ to 6 GHz. This work provides strong support for the application of transformation optics to plasmonic circuits and could pave the way toward high-performance, large-scale integrated photonic circuits.
MIT Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1073/pnas.1508777112
