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Experimental Realization of Strong DC Magnetic Enhancement with Transformation Optics
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
2014 (English)In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 146, 187-194 p.Article in journal (Refereed) Published
Abstract [en]

A passive DC magnetic concentrator is designed with transformation optics (TO) and realized by meta-materials. The passive DC magnetic concentrator based on space compression transformation can greatly enhance the magnetic field in a free space region and can be used for e.g., improving the sensitivity of magnetic sensors and increasing the efficiency of wireless energy transmission. The magnetic property of the medium obtained by TO is extremely anisotropic. To solve this, we use magnetic metamaterials made of alternated high-permeability ferromagnetic (HPF) materials and high-temperature superconductor (HTS) materials. We optimize our structure by conducting simulations using the finite element method (FEM) and experimentally demonstrate a strong, 4.74-time enhancement of the DC magnetic field by our meta-material magnetic concentrator. We also demonstrate that a simplified structure with only HPF materials working at room temperature can still gives 3.84-time enhancement of the DC magnetic field. The experimental results are in good agreement with the numerical simulations based on FEM.

Place, publisher, year, edition, pages
2014. Vol. 146, 187-194 p.
Keyword [en]
Positive Permeability, Cloak, Field
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-149239DOI: 10.2528/PIER14042704ISI: 000339161500019OAI: oai:DiVA.org:kth-149239DiVA: diva2:738890
Funder
Swedish Research Council
Note

QC 20140819

Available from: 2014-08-19 Created: 2014-08-18 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Transformation Optics for Controlling DC Magnetic Field
Open this publication in new window or tab >>Transformation Optics for Controlling DC Magnetic Field
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Based on the form-invariant of Maxwell’s equations under coordinate transformations, we extend the theoryof transformation optics to transformation magneto-statics, which can design magnets through coordinatetransformations. Some novel DC magnetic field illusions created by magnets (e.g. rescaling magnets,cancelling magnets and overlapping magnets) are designed and verified by numerical simulations. Ourresearch will open a new door to designing magnets and controlling DC magnetic fields.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiv, 81 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2014:051
Keyword
Transformation magneto-statics, magnets, DC magnetic field
National Category
Materials Engineering Electrical Engineering, Electronic Engineering, Information Engineering Other Physics Topics
Research subject
Electrical Engineering; Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-155326 (URN)978-91-7595-328-1 (ISBN)
Public defence
2014-12-01, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20141105

Available from: 2014-11-05 Created: 2014-11-04 Last updated: 2014-11-05Bibliographically approved

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Sun, FeiHe, Sailing
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