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Static Magnetic Clo...
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Jiang, WeiZhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China.
(författare)
Static Magnetic Cloak without a Superconductor
- Artikel/kapitelEngelska2018
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American Physical Society,2018
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LIBRIS-ID:oai:DiVA.org:kth-230496
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230496URI
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https://doi.org/10.1103/PhysRevApplied.9.054041DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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QC 20180615
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Similar to its electromagnetic counterpart, magnetic cloaking also has very important technological applications. However, the traditional method to build a static magnetic cloak requires the use of superconducting materials as the diamagnetic component, which seriously limits the practical potential because of the cryogenic condition. We show that a diamagnetic active current boundary combined with a high-permeability magnetic inner shell (MIS) can be designed to solve this problem, rendering an ideal magnetic cloaking effect at zero frequency. We first theoretically prove that a current boundary could magnetically behave as a superconductor to external observers. Based on this phenomena, we introduce a high-permeability MIS made of magnetically ultrasoft metallic sheets (permeability mu > 10(3)) and experimentally prove that the bilayer combination can exactly balance out the disturbance to the external probing field and, meanwhile, have a large invisible inner space. We also show that the active boundary currents can be accordingly configured to overcome the permeability and frequency band limits, leading to a robust cloak over the entire quasistatic frequency region. Our work creates an efficient way to circumvent the traditional limits of metamaterials to build magnetic cloaks for ultralow frequencies. The active-passive hybrid approach could be generally extended to yield other artificial magnetic devices or systems as well.
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Ma, YunguiZhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China.
(författare)
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He, SailingKTH,Elektroteknisk teori och konstruktion,Zhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China(Swepub:kth)u1tir6md
(författare)
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Zhejiang Univ, Coll Opt Sci & Engn, State Key Lab Modern Opt Instrumentat, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China.Elektroteknisk teori och konstruktion
(creator_code:org_t)
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Ingår i:Physical Review Applied: American Physical Society9:52331-7019
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