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One-way edge mode in a gyromagnetic photonic crystal slab
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-3401-1125
2012 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 37, no 19, 4110-4112 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate that one-way electromagnetic modes could be sustained by the edge of a gyromagnetic photonic crystal slab of triangular lattice under an external dc magnetic field. The applied magnetic field breaks the time-reversal symmetry of the three-dimensional system, and thus the original degeneracy point in k space, at which two dispersion surfaces intersect, is lifted, resulting in a photonic band gap below the light cone. At this band gap, the one-way mode is localized horizontally to the slab edge, while confined by the index contrast in the vertical direction.

Place, publisher, year, edition, pages
2012. Vol. 37, no 19, 4110-4112 p.
Keyword [en]
Applied magnetic fields, DC magnetic field, Degeneracy point, Dispersion surface, Electromagnetic modes, Index contrasts, K space, Photonic crystal slab, Slab edges, Three dimensional systems, Time reversal symmetries, Triangular lattice, Vertical direction
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-104701DOI: 10.1364/OL.37.004110ISI: 000309542900062ScopusID: 2-s2.0-84867155082OAI: diva2:567079

QC 20121112

Available from: 2012-11-12 Created: 2012-11-09 Last updated: 2016-08-16Bibliographically approved
In thesis
1. Theoretical Investigation on Propagation and Coupling of Nonreciprocal Electromagnetic Surface Waves
Open this publication in new window or tab >>Theoretical Investigation on Propagation and Coupling of Nonreciprocal Electromagnetic Surface Waves
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis aims at revealing the fundamental guiding and coupling properties of nonreciprocal electromagnetic surface waves on magneto-optical or gyromagnetic media and designing novel applications based on the properties.

We introduce the background in the first chapter. We then describe the concept of nonreciprocity and the main calculation method in the second chapter. In the third chapter, we show that one-way waves can be sustained at the edge of a gyromagnetic photonic crystal slab under an external magnetic field. We also investigate the coupling between two parallel one-way waveguides. We reveal the condition for effective co-directional and contra-directional coupling. We also notice that the contra-directional coupling is related to the concept of a “trapped rainbow”.

In the fourth chapter, we address the concept of a “trapped rainbow”. It aims at trapping different frequency components of the electromagnetic wave packet at different positions in space permanently. In previous structures, the entire incident wave is reflected due to the strong contra-directional coupling between forward and backward modes. To overcome this difficulty, we show that utilizing nonreciprocal waveguides under a tapered external magnetic field can achieve a truly “trapped rainbow” effect at microwave frequencies. We observe hot spots and relatively long duration times around critical positions through simulations and find that such a trapping effect is robust against disorders.

Lastly, in the fifth chapter, we study the one-way waves in a surface magnetoplasmon cavity. We find that the external magnetic field can separate the clockwise and anti-clockwise cavity modes into two totally different frequency ranges. This offers us more choices, both in the frequency ranges and in the one-way directions, for realizing one-way components. We also show the waveguide-cavity coupling by designing a circulator, which establishes the foundation for potential applications.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. xii, 62 p.
TRITA-EE, ISSN 1653-5146 ; 2016:094
wave propagation, coupling, magneto-optical, gyromagnetic, photonic crystal, nonreciprocity, one-way, trapped rainbow
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
urn:nbn:se:kth:diva-190792 (URN)978-91-7729-055-1 (ISBN)
Public defence
2016-09-09, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Swedish Research Council, VR 621-2011-4620

QC 20160816

Available from: 2016-08-16 Created: 2016-08-15 Last updated: 2016-08-16Bibliographically approved

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