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Revealing the truth about 'trapped rainbow' storage of light in metamaterials
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.ORCID iD: 0000-0002-3401-1125
2012 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 2, 583- p.Article in journal (Refereed) Published
Abstract [en]

It was claimed that the incident light can be gradually slowed down and finally trapped in a tapered metamaterial waveguide. Here we show that the energy incident from the input port of the tapered metamaterial waveguide will be totally reflected (instead of being trapped) due to the strong intermodal coupling between the forward and backward modes. The underlying physical mechanism for this strong intermodal-coupling is given. The occurrence of energy reflection is unambiguously proved using several independent methods, (1) the semi-analytical mode matching technique, (2) the numerical finite element simulation, (3) the requirement of energy and momentum conservation, and (4) an experimental verification at microwave frequency. The dream of 'trapped rainbow' for storage of light might still be possible if this intermodal coupling could be blocked, and our study provides a useful guidance for such an endeavor.

Place, publisher, year, edition, pages
2012. Vol. 2, 583- p.
Keyword [en]
Electromagnetic-Waves, Refraction, Plasmons, Index, Slab
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-103157DOI: 10.1038/srep00583ISI: 000308139800001ScopusID: 2-s2.0-84866059058OAI: diva2:559552
Swedish Research Council

QC 20121009

Available from: 2012-10-09 Created: 2012-10-04 Last updated: 2013-11-19Bibliographically approved

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He, Sailing
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Electromagnetic EngineeringZhejiang-KTH Joint Research Center of Photonics, JORCEP
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